GE AKR-30 Series Maintenance Manual
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GE AKR-30 Series Maintenance Manual

GE AKR-30 Series Maintenance Manual

Low-voltage power circuit breakers
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  • Page 2: Table Of Contents

    Table of Contents Page Page SECTIO N 7 SECTION Auxiliary Switch INTRODUCTION 1 .0 Replacement Inspection and Maintenance 7.6.1 1 . 1 7.62 Adjustment Renewal Parts 1 .2 Shunt Trip SECTION 2 7.7.1 Replacement Adjustment 7.7.2 GENERAL DESCRIPTION Undervoltage Device Frame Size Replacement 7.8.1...
  • Page 3 " Page Page SECTION 13 SECTION 10 1 3.2.1 Short Time-Delay TYPE SST OVERCURRENT 1 0.0 Tripping TRIP DEVICE 1 3.2.2 Long Time-Delay Programmer Unit 10.1 Current Sensors Tripping 10.2 1 0.2.1 Replacement of Current Instantaneous 1 3.2.3 Sensors Tripping Flux Shift Trip Device 10.3 1 3.2.4...

  • Page 4: Inspection And Maintenance

    SECTION 1-lntroduction A basic inspection should consist of the following: a. Visual Check - Look for dirt, grease or other forei These instructions provide the maintenance procedures material on any breaker parts. Check insulating surfac and describe the operation of the thru 2000 amp frame...
  • Page 5 TABLE BREAKER MODELS MOUNTING TYPE DRAWOUT DEEP FRAME SIZE BREAKER FUSED DESIGNATION AK� AKD-8 STRUCTURE STATIONARY ESCUTCHEON BREAKER (AMPERES) AKR-(•)A 30, 30H AKR-(•)8 30, AKR-(•)D AKR-(•)S 30, 30H 1 600 AKR-(•)8 50, SOH AKR·(•)D 50, SOH AKR-(•)S 50, SOH AKRT-(•)A 50, SOH 2000 AKRT-(•)8 50, SOH AKRT-(•)D 50, SOH...

  • Page 6: General Description

    SECTION 2-General Description Type AKR low-voltage power circuit breakers are used for controlling and protecting power circuits in the low­ voltage range (usually up to 600 volts). In serving this function, they are a means of safely switching loads and automatically clearing circuits when abnormal conditions occur.
  • Page 7 r·· · FIG. 2 - Electrically Operated AKR-SB-30 FIG. 3 Fused Breaker AKRU-60-30 FIG. Drawout Breaker...

  • Page 8: Mounting

    SECTION 2-General Description {Cont.) TRIP DEVICE MOUNTING There are types of solid-state, direct-acting, self­ Type AKA breakers are designed for either drawout or powered trip device systems associated with AKA break­ stationary mounting. Drawout breakers (See Fig. ers. These systems are for AC applications only. For DC equipped with features which make them easy to install in applications an electro-mechanical system is available.

  • Page 9: Short Circuit Ratings

    SHORT CIRCUIT RATINGS Short circuit ratings vary with the applied system vol­ VAC systems they are also dependent upon tage. On whether the overcurrent trip device contains an instan­ taneous trip element. See Table TABLE 4 - BREAKER INTERRUPTION RATINGS 3c/>...

  • Page 10: Storage

    SECTION 3-Storage The rejection hardware prevents the converse bf a. thru d. above. A detailed description of the rejection pin and bracket combinations used is given in Installation manual, GEl It is recommended that the breaker be put into service 86150.

  • Page 11: Breaker Operation

    ELECTRICAL CLOSING SECTION 5-Breaker Operation On electrically operated breakers the closing springs are charged by a gear motor. With the springs discharged, voltage applied to the control circuit will energize the motor " " through the switch contacts - see Fig. The motor, A breaker may equipped to operate either manually...
  • Page 12 5.2.1 ALTERNATE CONTROL CIRCUIT breaker (if so equipped) or by a remote closing switch. Later production breakers use the electrical control Operation of the closing switch energizes the K-relay circuit shown in Fig. 9A for all control voltages except which in turn energizes the closing solenoid. Thi�...

  • Page 13: Charging Using The

    5. 3 M ECAHNISM OPERATION Figure 10 shows the mechanism components in the Closed, Tripped and Reset positions. The closing spring is shown in the charged position in all of these details. Closed Position- As shown in Fig.10A, the movable contacts are held against the stationary contacts by the toggle linkage.
  • Page 14 SECTION 5-Breaker Operation {Cont.} (�i:) El £ G f N ERA L FIG. 1 2 ROLLER ENGAGED WITH CLOSING PROP There is a ratchet assembly attached to the camshaft Rotate the camshaft using the maintenance handle until the ratchet assembly's roller engages with the prop. Do not extension.

  • Page 15: Racking Mechanism Interlock

    SECTION 6-lnterlocks breakers are equipped with safety interlock devices that are required by Industry Standards and Certifying Au­ thorities. Interlock devices for special applications are also available as options. The standard interlock devices de­ scribed below are used only on drawout breakers. Station­ ary breakers have no required interlocks.

  • Page 16: Positive Interlock

    SECTION 6-lnterlocks (Cont.) FIG. 1 5 FIG. 1 6 - POSITIVE INTERLOCK RACKING SCREW COVER INTERLOCK C LOSED POSITION position, the crank's pin reaches the end of the slot in the linkage. Continued motion of the racking mechanism causes the linkage to rotate the lever which moves the closing solenoid armature forward.

  • Page 17: Padlocks

    DISCONNECT POSITION I NTERLOCK The function of the Disconnect Position Interlock is to block the RACKING SCREW cover open when the racking mechanism is in the DISCONNECTED position. When the cover is held open, the TRIP button is depressed. The mechanism is held trip-free and there is no contact arm movement when the closing spring is discharged by the Closing Spring interlock.

  • Page 18: Key Interlock-Stationary Breaker

    SECTION &-Interlocks (Cont.) O PTIONAL INT ERLOCKS KEY I NT ERLOCK-STAT IONARY B REAKER The optional interlocks are key interlocks and door inter­ The function of the Key Interlock is to prevent an open locks. On drawout breakers, these devices are mounted in breaker from being closed when the lock bolt is extended the equipment and are part of the breaker enclosure.

  • Page 19: Manual Handle Adjustment

    SECTION 7 -Breaker Maintenance (Cont.) MANUAL HANDLE ADJUSTMENT The areas requiring l ubrication are: On manually-operated AKA breakers, the closing springs may be charged either by a single 1 35 degree Contacts - A thin fil m on the stationary and clockwise handle stroke or up to four multiple strokes of movable contact assembly pivot surfaces.

  • Page 20: Drawout Mechanism Position

    SECTION 7-Breaker Maintenance (Cont.) D RAWOUT MECHANISM POSIT ION Remove the hex-head bolt only, do not remove or loosen the slotted head screw shown in Fig. 21 . Removal of the Maintenance or inspection should be conducted with the slotted head will cause the closing spring to become dis­ breaker on a workbench.

  • Page 21: Primary Disconnects

    SECTION 7-Breaker Maintenance (Cont.) P RIMARY DISCONNECTS ampere breakers use four primary disconnect Primary disconnects are found only on drawout break­ fingers per phase. The 1 600 and 2000 ampere breakers use eight fingers per phase. Fig. 22 shows a line and load ers.
  • Page 22 SECTION 7-Breaker Maintenance (Cont.) 7 .5.1 REPLACEMENT Figs. 22, 23, 24, and 25 show the primary disconnect assembly breakdown. Refer to these illustrations when replacing the disconnects. Note the following details: Fig. 25- The position of the spacer in the breaker stud. The hole in the spacer must be positioned as shown so it will align with the holes in the clip.

  • Page 23: Replacement

    :To check the setting, arrange the breaker for "slow­ 7.4. close" as described in Section Through the use of a continuity tester, observe the position of the breaker con­ tacts when the switch's LI-LIC "A" contacts touch. At this � point the breaker's arcing contacts must be within .250 "•...
  • Page 24 SECTION 7-Breaker Maintenance (Cont.) FIG. 32A - UNDERVOLTAGE DEVICE If excessive clearance or binding exists, loosen the screws holding the magnet assembly to the frame and move the magnet up or down as necessary. Tighten the screws to 27 to in-lbs.
  • Page 25 When adjusting the pick up level on instantaneous de undervoltage devices, set the gap between the armature INSERT .030 WIRE and magnet to inches using the adjustment screw GAGE shown in Fig. 32C. After setting the pick up level, use this same adjustment screw to obtain the drop out setting.
  • Page 26 SECTION 7-Breaker Maintenance (Cont.) Check resistance of the disconnected undervoltage device. for values. instruction Sheet GEH-4545 for more detailed infor­ mation, including schematic diagrams and circuit descrip­ tion. The undervoltage device must be calibrated through the time-delay unit after the device pick up has bee n adjusted. .008 inch minimum closed g must exist between the ar­...
  • Page 27 SECTION 7-Breaker Maintenance (Cont.) 7.1 1 .3 REPLACEMENT The mechanism i s reset by disengaging the side latch link from the upper latch link or by closing the breaker if a bell alarm Is mounted on the right hand side of the frame locklever is not provided.
  • Page 28 SECTION 7-Breaker Maintenance (Cont.) 7.12.1 COMPONENT REPLACEMENT To gain access to the electrical control components, the breaker's front escutcheon must be removed. Type B breakers require that both the deep molded escut­ cheon and the shallow steel escutcheon be removed. Before removing the front escutcheon on Type A or B breakers, a supporting block should be placed under the 36A,...
  • Page 29 F AND G SWITCH ADJUSTMENT 7 .1 2.2 For proper electrical operation, the F and G mechani­ cally operated switches must operate at the proper point in the closing c ycle. If these switches are to be replaced, measure the distance between the tip of the switch button and the bracket on which they are mounted.
  • Page 30 SECTION 7-Breaker Maintenance (Cont.) FIG. 38 - D RAWOUT MECHANISM DETAI LS FIG. RACKING MECHANISM INSTAL LED...
  • Page 31 SECTION 7-Breaker Maintenance (Cont.) 7.1 4 B UFFER ASSEMBLY When the breaker is closed, the energy in the closing When the break�r is opened, the end plate assembly is spring is transferred to the main s haft through the driven against the opposite end of the buffer assembly. mechanism.
  • Page 32 SECTION 7-Breaker Maintenance (Cont.) NEOPRENE WASHERS 7.1 4.1 BUFFER ADJUSTMENT Referring to Fig. 40, with the breaker closed and the mechanism not reset, a .005 " min. clearance must exist between the end plate assembly and the buffer nut as shown.
  • Page 33 SECTION 8-Contact Maintenance ARC CHUTE REMOVAL AND INSPECTION Breakers subjected to frequent interruption of high cur­ There are two types of arc chute construction used on rents may eventually require replacement of their contacts. 2000 thru ampere breakers. They are the ceramic The general rule for determining need of replacement is type shown in Fig.
  • Page 34 SECTION 8-Contact Maintenance (Cont.) CONTACT ADJUSTMENT ­ AKR 30130H & AKRU 30 The contact structure of the AKR 30 and the AKRU 30 breakers is slightly different from the AKR 30H. Referring to & B, Fig. both structures use one moveable contact arm, and two stationary arcing contacts.
  • Page 35 SECTION 8-Contact Maintenance (Cont.) A K R 30H FIG . 448 800 AMP CONTACT STR U CT U R ES...
  • Page 36 SECTION 8-Contact Maintenance {Cont.) CONTACT ADJUSTMENT - AKR 50150H & AKRU 50 · Attach a continuity checker (bell-set, light, or ohm­ The contact structure shown in Fig. 47 is used by all AKR50 breaker types. This structure uses two movable meter) between the upper and lower stud.
  • Page 37 CONTACT ADJUSTMENT­ AKRT 50/SOH 1 . Open the breaker. The contact structure shown in Fig. 48 is used by all AKRT 50 breaker types. This structure is similar to the AKR Arrange the breaker for slow-closing. 50 structure. There are two movable contact arms, each 3.
  • Page 38 SECTION 8-Contact Maintenance (Cont.) STATIONARY CONTACT IDENTIFICATION The stationary arcing, intermediate, and main contacts each have a different function during current conduction and current interruption. For this reason, these contacts are made using different material compositions. Also, the different functions require that the contacts replaced in configurations shown in Figs.
  • Page 39 CONTACT REPLACEMENT - CONTACT REPLACEMENT ­ AKR 50/50H , AKRU 50 & AKRT 50/50H AKR 30/30H & AKRU 30 Refer to Stationary Contact Identification, Section 8.5, Refer to Stationary Contact Identification, Section before replacing any stationary contacts. before replacing any stationary contacts. The stationary intermediate and main contacts are The stationary contacts are held in place by the contact replaced just like the stationary contacts on the...
  • Page 40 SECTION 8-Contact Maintenance (Cont.) FIG. ARC RU N N ER REMOVED FIG. SOC - ARCING CONTACT SOB - PIVOT REMOVED...
  • Page 41 SECTION 9-Fused Breakers SPECIAL 2500A FUSE FOR AKRU-50 There are two types of fused breakers; AKRU 30, 800 ampere frame and AKRU 50, 1 600 ampere frame. Except This fuse provides a melting time-current characteristic for the open fuse lockout device and the integrally­ that coordinates with 1 600A trip devices.
  • Page 42 SECTION 9-Fused Breakers (Cont.) WHEN REPLACING THE FUSE IN THE CAUTION: LEFT POLE (FRONT VIEW) OF THE BREAKER, NOTE PAR TI C ULARL Y THA T THIS FUSE IS MOUNTED DIFFERENTLY THAN THE OTHER TWO FUSES. A S SHOWN IN FIG . FOR THIS PHASE 1 80 THE FUSE IS ROTA TED...
  • Page 43 SECTION 9-Fused Breakers (Cont. ) OPEN FUSE LOCKOUT DEVICE This device automatically trips the fuse breaker if one of the fuses opens. When this happens, the breaker is locked open until the reset button of the phase involved is pushed. The breaker should not be reclosed, of course, until the opened fuse is replaced.
  • Page 44 SECTION 9-Fused Breakers (Cont.) -·- ==r ___) _. ARMATURE RESET BUTION FIG. 56A-DETAILS FIG. 568-INSTALLED TYP E A OR 8 B R EAKER O FLO DEVICE...
  • Page 45 SECTION Type SST Overcurrent Trip Device • The SST is a solid-state, direct-acting, self-powered trip device system. The SST system consists of the SST pro­ grammer unit, current sensors, and a flux shifter trip de­ OVOI.CWI vice. Fig. 57 shows a block diagram of the system. I TAIIGET 1 0.1 PROGRAMMER UNIT...
  • Page 46 SECTION Type SST Overcurrent Trip Device (Cont.) FIG. 59 - AKR-58-30 1 0.2 C U R RENT SENSORS · The SST system uses two types of current sensors, phase sensor and a neutral sensor. Fig. 60 shows a phast. sensor. Fig. 61 shows the neutral sensors available. The current sensor supplies the power and sig nal inputs necessary to operate the trip system .
  • Page 48 1 0.2.1 REPLACEM ENT O F CU R RENT SENSORS d) When rep laci n g the stud connector, tighten the Referri ng t o F i g . 63, replacement o f i nd ividual SST ± Allen head screws to 250 10 i n·l bs.
  • Page 49 So long as the actuator remains i n the Reset posi­ 1 . Remove the flux shifter leads from the harness. tion the breaker can be closed and opened normally 2. Referri ng to the cabl ing d i ag rams in Section 1 0.5, at will.
  • Page 51 1 0.4 TROU BLESHOOTING When malfunctioning is suspected the first step in b) using the Ground Fault Defeat Cable as shown troubleshooti ng is to examine the circuit breaker and its in Fig. This special test cable energizes a ll the power system for abnormal conditions such as: primary windings of the differential transformer in a self-cancelling, series-parallel connection so...
  • Page 52 SECTION Type SST Overcurrent Trip Device (Cont.) SST TEST SET 1 0.4.1 1 0.4.2 RESISTANCE VALUES The TAK-TS1 and TAK-TS2 Test Sets are portable in­ struments designed for field-checking the time-current For use in troubleshooting, the Common to Tap resist­ characteristics and pickup calibration of the SST's ance for SST current sensors is given in Table 8.
  • Page 54 SECTION 1 0-Type SST Overcurrent Trip Device PROGRAMMER DEVICE FLUX SHIFT ,-- - -- - UNIT TRIP WHITE BLACK WHITE BLACK WHITE LOAD PROGRAMMER CONNECTOR 201217·1) (AMP FIG. 69 - CABLING DIAGRAM - SST WITH GROUND FAULT ON 3-WIRE LOAD PROGRAMMER DEVICE FLUX SHIFT...
  • Page 56 SECTION 1 1 -Type ECS Overcurrent Trip Device The ECS is a solid-state, direct-acting, self-powered trip device system. The ECS system consists of the ECS programmer unit shown in Fig. 72, current sensors, and a fl ux shifter trip device. Fig. 73 shows a block diagram of the system.
  • Page 57 TABLE 9 ECS TRIP CHARACTERISTICS ECS PROGRAMME R ADJUSTMENT RANGE (Set Points) Trip • Rating in Amperes Short Time -- - � • SeDSOr Rating Long Time Frame Size Instantaneous ® ® Breaker Band ® Type Pick (•L) Time Pickup Time Picku p Sensor...
  • Page 58 SECTION 1 2-MicroVersaTrip™ Trip Device 1 2.1 .1 FAULT TRIP INDICATORS The MicroVersaTrip is a solid-state, direct-acting, self-powered trip device system. The MicroVersaTrip The optional fault trip indicators are similar to the SST system consists of the MicroVersaTrip programmer, indicators. They are mechanical pop-out type for identify­ current sensors, and a flux shifter trip device.
  • Page 59 The remote fault Indication switch leads are brought out the bottom of the Mi.croVersaTrlp programmer as shown In Fig. 78. This switch lead harness is plugged Into the mating connector on the breaker, see Fig. 79. The switch leads are brought out from the breaker through the Programmer Secondary Disconnect shown In Fig.
  • Page 61 TABLE 1 1 TRIP FUNCTIONS AVAILABLE Features BASIC FUNCTIONS ADD TO BASIC FUNCTIONS STD.-or-5-or-H-or-M G-or-GR A 1-or-A2-or·A:kK·A Z1 -or-22-or-Z • Adjustable Current Setti ng • Adj Long-Time Pickup • Adj Long- Time Delay LONG • TlME • Remote Long-Time Timing Ught Short - •...
  • Page 62 SECTION 1 2-MicroVersaTrip™ Trip Device (Cont.) TAPPED COMMON TERMINAL FIG. M I C ROVERSATRIP'M PHASE 83 - FIG. TYPICAL N EUTRAL S ENSOR SEN SORS "'••"'t �� '- .& • •-.G C t �a.. E :: ' � � { ' H '-Optlon Phase Sensor FIG.
  • Page 63 Since the neutral sensor is mounted separately from the breaker, a d i sconnect means is requi red to con nect its output to the breaker. Fig. 86 shows the breaker and equi pment mounted 4th wire secondary d i sconnect used with the M icroVersaTrip system. 1 2.2.1 REPLACEM ENT OF CU RRENT SENSO RS...
  • Page 64 SECTION 1 2-MicroVersaTrip™ Trip Device (Cont.) 1 2.3 FLUX SHIFTER TRIP DEVICE Once It has been established that the circuit breakf can be opened and closed normally from the test posltior., The only difference between the MicroVersaTrip and attention can be directed to the trip device proper. Testing SST flux shifter trip devices is the solenoid winding.
  • Page 66 SECTION 1 2-Micro Versa Trip ™ Trip Device (Cont.) 1 2.5 CABLI N G DIAG RAMS •B • c •A PROGRAMMER A A A FLUX SHIFT UNIT TRIP DEVICE rf -1-t- \ �-- - -- - ..? � ��� � )===)= ..
  • Page 67 • a • c PROGRAMMER SHIFT FLUX r- - --- UNIT TRIP DEVICE BREAKER BACK FRAME � NEUTRAL SENSOR - - 1 DISCONNECT LINE HARNESS PR O GR AMMER CO N NE CT O R CO N NE CTOR AM P 1 _350 356- 9 FIG.
  • Page 68 SECTION 1 2-MicroVersaTrip™ Trip Device (Cont.) BREAKER PROGRAMMER GROUND FAULT DEFEAT MODULE HARNESS UNIT , - - -, CAT. NO. TVTGD9 CONNECTOR r -t -E-+--0 o-+-< o-+-< ""t-0 o-+-< � C>-+-< ""t-0 o-+-< � 0+-< +t-O e>-t--< � o-+-< ++-<> o+-<...
  • Page 69 PROGRAMMER REMOTE FAULT MICRO-VERSA TRIP SECONDARY INDICATION PROGRAMMER CONNECTOR DISCONNECT EQUIPMENT BREAKER , - - - - -1 OVERLOAD SHORT CIRCUIT GREEN GROUND FAULT OVERLOAD PICKUP ...J _ _ _ 1·350239-9 1-350242·9 1·350235-9 1-350246-9 FIG. 95. CABLI N G DIAGRAM-REMOTE FAULT I NDICATION PROGRAMMER MICRQ-VERSA TRIP SECONDARY...
  • Page 70 SECTION 1 3-EC Trip Device Type EC overcurrent trip devices are magnetically The standard EC trip device for breaker frames up operated, using a series coil or single conductor, and an amps is the type EC-2A, see Fig. 97. An optional tr., 2000 associated magnetic structure to provide tripping force.
  • Page 71 SECTION 1 3-EC Trip Device (Cont.} ..-,."::.. "'.-.- - � ' ..,. . _ -:- ., ··---� -.- :. :: "fi • ' � I. ,. _1_ • •. • • r' , , • . . : . - :.:. ·...
  • Page 72 1 3.1 .2 INSTANTANEOUS LOW-SET TRIPPING 13.1 SERIES OVERCURRENT TRIPPING DEVICE EC-2A The low-set instantaneous pick-up point may be varied by the adjustment knob The calibration in this case usually ranr (3). The Type EC-2A overcurrent tripping device is available in from 80 percent to 250 percent of the series coil rating, with .
  • Page 73 comes this restraining force, the armature movement is further 1 3.2 SERIES OVERCURRENT TRIPPING retarded by an escapement mechanism which produces an in­ DEVICE Ec-1 verse time delay characteristic. The mechanism is shown on Each series overcurrent tripping is enclosed in a device Fig.
  • Page 74 1 3.3 POSITIVE TRIP ADJUSTMENT 1 3.2.3 INSTANTANEOUS TRIPPING Before attempting any checks or adjustments on breaker wi� (a) Adjustable instantaneous tripping takes place after the EC trip devices, the breaker mechanism and trip latch should magnetic force produced by an overcurrent condition, over­ comes the restraining force of the calibration spring which checked to assure their proper functioning so that the breakt.
  • Page 75 SECTION 1 3-EC Trip Device {Cont.) normal direction, the magnetic flux of the series coil and the 1 3.4 REVERSE CURRENT TRIPPING DEVICE magnetic flux of the potential coil produce a torque which tends case The device is enclosed in a molded and is mounted on to rotate the armature counterclockwise.
  • Page 76 1 3.6 13.4.1 TRIP DEVICE REPLACEMENT ADJUSTMENTS Overcurrent devices on AKR30 & AKR50 breakers may bA The only adjustment to be made on the reverse current de­ · dismounted by removing fastening hardware at the rear vice is to make sure that the trip has a minimum overtravel beia of 1 /32 in.

  • Page 77: Auxiliary Switch

    ·sECTION 14-Eiectrical Characteristics TABLE 1 6 CHARGING AND CLOSING OPERATING CURRENTS MOTOR ANTI·PUMP CONTROL CLOSING RELAY "W" RELAY "X" "' SOLENOID Current (Amps) "" � • • • o a. "S a. "S a. Cll . t:: CII � 0 Rated-Amps Rated Amps Rated Amps...
  • Page 78 TABLE SHUNT TRIP AND UNDERVOL TAGE DEVICE OPERATING CURRENTS SHUNT TRIP UNDER VOLTAGE "" 8 & Current Current (Amps) (Amps) 'i .! I > Operating lnruah Operlltl n g lnruah Sealed Sealed "" Voltage ,.nge Open Open Cloud CloMd Voltage ,.nge .
  • Page 79 TABLE 23 1NSTANTANEOUS UNDERVOLTAGE DEVICE SETT I NGS PICK UP VOLTAGE RANGE COI L UVR I N STALLED DROP OUT UVR O N LY MECHANISM R ESET RATING RANGE 24 VDC 1 8 . 20 1 6 . 20 7 . 8.3 48 VDC 36 .
  • Page 80 These ,nst'vtflOI"' Oc "'01 D""'P<Y' IU co..,- all o.t.,s 01 .,.,..flrOtt J , eoutpmerlf f"'()t ro oro .. •att ,.._ .., ()( l ' ' �. ( �� .. rc o. ,.,., ,., CO"W"'eC&ot" .,., '"S'Mf•ttor" For further 1nformat1on General Electnc call Gpitl•t•OI"' Of ..,.,,.,.,�...
  • Page 81 GEK-644590 Maintenance Manual Low Voltage Power Circuit Breakers Types AKR-30 I 50 AKRT-50...
  • Page 82 Low Voltage Power Circuit Brea kers Table of Contents Page Page SECTIO N 1 SECTIO N 7 1 .0 I NTRODUCTION Auxil iary Switch 7.6. 1 1 . 1 I nspection and M ai ntenance Replacement 7.6.2 Adj ustment 1 .2 Renewal Parts Shunt Trip SECTIO N 2...
  • Page 83 Page Page SECTION 1 0 SECTION 1 4 1 0.0 TYPE SST OVERCURRENT 1 4. 0 M ICROVERSATRI P '" P LUS AND M ICROVERSATRIP PM TRIP U N ITS 7 7 TRIP DEVICE 1 4. 1 Trip U n it 1 0.1 Programmer Unit 1 4.

  • Page 84: Inspectio N And Maintenance

    SECTION 1 -lntroduction A basic i nspection should consist of the following : a. Visual Check - Look for dirt, grease or other foreign These i nstructions provide the mai ntenance procedures material on any breaker parts. Check insulati ng surfaces and describe the operation of the thru amp frame...
  • Page 85 TABLE 1 BREAKER MODELS MOUNTING TYPE DRAWOUT FRAME SIZE BREAKER S U B- DEEP FUSED (AMPERES) DESIGNATION AKD-5 AKD-8 STRUCTURE STATIONARY ESCUTCHEON BREAKER AKR-(*)A 30, 30H AKR-(*)8 30, 30H AKR-(*) D 30, 30 H , 30L AKR-(*)S 30, 30H AKR-(*)A 50, 50H AKR-(*)8 50, 50H 1 600 AKR-(*)D 50, 50H...

  • Page 86: Frame Size

    The d rawing number appears on the breaker nameplate and can be obtained from GE. FUSED/NON FUSED 2 . 1 FRAME S IZ E Fused breakers are identified as either AKAU 30 (800 ampere frame size) or AKAU 50 ( 1 600 am pere frame size) .
  • Page 87 FIG. 2 Electrically Operated AKR-70-30 FIG. 3 Fused Breaker AKRU-60-30 PRIMARY 7"' " ' " " "' FIG. 4 - Drawout B reaker...

  • Page 88: Mounting

    SECTION 2-General Description (Cont.) TRIP DEVICE 2 .4 MOUNTI NG Type AKA breakers are designed for either drawout or There are several types of solid-state, direct-acti n g , self­ stationary mounting. Drawout breakers (See Fig. powered trip d evice system s associated with AKA equi pped with features which make them easy to instal l in breakers.

  • Page 89: Short Circuit Ratings

    SHORT CIRCUIT RATINGS 2 .7 Short circuit ratings vary with the applied system vol­ tage. On 240 VAC systems they are also dependent upon whether the overcurrent trip device contains an instan­ taneous trip element. See Table 4. TABLE 4 BREAKER I NTERRUPTION R ATINGS 3<!>...

  • Page 90: Storag

    3 . 1 Safety SECTIO N 3 . 0-Storage, Safety, Maintenance Each user must maintain a safety program for the protec­ tion of personnel, as wel l as other equipment, from the I t is recommended that the breaker be put into service potential hazards associated with electrical equ ipment.
  • Page 91 3 . 2 Maintenance Instruction books supplied by manufacturers address Both long and short term maintenance o f a l l electrical com ponents that would normally require service or main­ equipment is essential for rel iability and safety. Mainte­ tenance during the useful life of the equi pment.

  • Page 92: Alternate Control Circuit 1

    ALTERNATE CONTROL CIRCUIT USED 5.2.1 equipped) or by a remote closing switch. Operation of the A second type of electrical control is shown in Fig . 9A closing switch energizes the K-relay, which in turn ener­ for all control voltages except 250 volts D.C. which uses g izes the closing solenoid "CC".

  • Page 93: Mechanism Operation 1

    M ECHA'N ISM O PE RATIO N Figures 1 OA, 1 08 and 1 O C show the mechaniSm com .. ponents in the Closed, Trip ped and Reset positions. The closing spring is in the charged position for all of these details.
  • Page 94 SECTION 5-Breaker Operation (Cont.) FIG . 1 2 - R O L L E R ENGAG E D WITH CLOSING PROP T h e r e i s a ratchet asse m b ly attached t o t h e c a m s h aft Rotate the camshaft u s i n g the m ai ntena nce h a n d l e u n t i l exte n s i o n .

  • Page 95: Racking M Echanism I Nterlock 1

    SECTION 6-lnterlocks AKR breakers are equipped with safety interlock devices that are requi red by I ndustry Standards and Certifyi ng Au­ thorities. I nterlock devices for special applications are also available as options. The standard interlock devices de­ scribed below are used only on drawout breakers. Station­ ary breakers h ave no required interlocks.

  • Page 96: Positive Interlock

    SECTION 6-lnterlocks (Cont. ) INTERLOCK FIG. 1 5 FIG. 1 6 - POSITIVE INTERLOCK RACKING SCREW COVER I NTER LOCK CLOSED POSITION crank pin reaches the end of the slot in the linkage. Continued motion of the racking mechanism causes the linkage to rotate the lever which m oves the c losing sole­...

  • Page 97: Discon Nect Position I Nterlock

    DISCONNECT POSITION I NTER LOCK The function of the Discon nect Position I nterlock i s to block the RAC KING SCREW cover open when the racking mechanism is in the D I SCONN ECTED position. When the cover is held open, the T R I P button is depressed . The mechanism is held trip-free and there is no contact arm movement when the closing spring is discharged by the Closing Spring i nterlock.

  • Page 98: Key I Nterlock-Stationary Breaker 1

    SECTION 6- lnterlocks (Cont.) KEY I NTERLOCK-STATIONARY When the breaker is in the C LOSED position , the fly­ B R EAKER wheel assembly item #2 is away from the lever item #6. The lever is spring loaded and rotates clockwise causing its pin to block the lock bolt extension.

  • Page 99: Manual Handle Adjustment

    SECTION 7-Breaker Maintenance (Cont.} MANUAL HANDLE ADJUSTMENT The areas req u i ri ng l u brication are: The adjustment l i n kage co nnects the handle assembly to Contacts Pivots - A t h i n fi l m on t he stat ionary the chain drive mechanism which turns the cam shaft.

  • Page 100: Drawout Mechanism Position

    SECTION 7-Breaker Maintenance ( Cont.) D RAWOUT MECHANISM POSITION Remove the hex-head bolt only, do not remove or loosen Maintenance or inspection should be cond ucted with the the slotted head screw shown in Fig . 2 1 . Removal of the breaker on a workbench.

  • Page 101: Primary Disconnects 2

    SECTION 7 -Breaker Maintenance {Cont.) The 800 ampere b reake rs w it h the exception of P R IMARY DISCONNECTS 30L use four primary d isconnect fingers per term inal. Primary disconnects are found only on drawout break­ The 1 600 amp, 2000 amp and 30L b reakers use ers.

  • Page 102: Replacement

    The GE S8- 1 2 replacement switch should have its shown i n Fig. 26 . 766" to . 797" Note that this d imension...

  • Page 103: Replacement

    E LECTROSWITCH TYP E 1 01 Adjustment is the same as the GE S B 1 2 except that when the switch "A" contacts touch, the breaker arcing contacts m ust be w ithin 0 to .250 inches of c losing.

  • Page 104: Operational Check

    SECTION 7 -Breaker Maintenance (Cont.) D ROPOUT VOLTAGE: On AC devices the d ropout level will fall within the req u i red limits (30% to 60% of the coil rating) if the pickup is set properly. On DC d evices, the d ropout level may need independent adjustment.

  • Page 105: Static Time-Delay Undervoltage

    INSERT WIR E OPEN GAP G A GE ADJUSTM ENT FIG. 328 - OPEN GAP CHECK FIG. 320 POSITIVE TRIP CHECK When installed, the voltage to be monitored is connected across term inals No. 1 and No. 2 of the static delay box.

  • Page 106: Electric Lockout Device

    SECTION 7 -Breaker Maintenance (Cont.) 3. Check resis t ance of the disconnected undervoltage device. See Table 5 for values. See i nstruction Sheet G EH-4545 for more detai led infor­ mation, i ncluding schematic diagrams and circuit descrip­ tion. The undervoltage device must be calibrated through the time-delay unit after the device pick up has been adjusted.

  • Page 107: Adjustments

    SECTION 7-Breaker Maintenance ( Cont.) 7.1 1 .3 REPLACEMENT The mechanism i s reset by disengaging the side latch link from the upper latch link or by closing the breaker if a The bel l alarm is mounted on the right hand side of the locklever is not provided.

  • Page 108: Component Replacement

    SECTION 7-Breaker Maintenance (Cont.) 7.1 2.1 COM PONENT REPLACEMENT To gai n access to the electrical control com ponents, the breaker's front escutcheon m ust be removed. Type B and D breakers requ i re that both the deep molded escut­ cheon and the shal low steel escutcheon be removed.

  • Page 109: Drawout Mechanism

    7 . 1 2.2 F AND G SWITCH ADJUSTME NT For proper electrical operation, the F and G mechani­ cally operated switches must operate at the proper point in the closing cycle. If these switches are to be replaced, measure the distance between the tip of the switch button and the bracket on which they are mounted.
  • Page 110 S E C T I O N 7 - B re a k e r M ai n t e n a n c e ( C o nt A D J U S T M E NT S L E E V L U B R I C A Ti O C O LL A...

  • Page 111: Buffer Assembly

    SECTION 7-Breaker Maintenance (Cont.) 7 . 1 4 BUFFER ASSEMBLY When the breaker is closed , the energy in the c losing When the break � r is opened, the end plate assembly is spring i s transferred to the m a i n s h aft thro u g h the driven against the opposite end of the buffer assembly.

  • Page 112: Buffer Adjustment

    SECTION 7-Breaker Maintenance (Cont.) NEOPRENE WASHERS 7 . 1 4 . 1 B U FF E R ADJUSTMENT WASHERS Referring to Fig. 40, with the b reaker closed and the m echanism not reset, a . 005" clearance m ust exist be­ tween the end p late assem bly and the buffer nut as shown.

  • Page 113: Contact Maintenance

    SECTION 8-Contact Maintenance 8 . 1 ARC C H UTE R E M OVAL A N D I N S P ECTIO N Breakers subjected to frequent interruption of high cur­ Th ere are two types of arc ch ute const ru cti on used rents may eventually requ ire replacement of their contacts.

  • Page 114: Contact Adjustment

    SECTION 8-Contact Maintenance (Cont.) CONTACT ADJUSTM ENT - AKR 30/30H & AKRU The contact structure of the AKR 30 and the AKRU 30 breakers is s lightly different from the AKR 30H. Referring to Fig. 44 A & B, both structures use one moveable contact arm, and two stationary arcing contacts.
  • Page 115 SECTION 8-Contact Maintenance ( Cont.) FIG. 44A - AKR30, AKRU30 FIG. 448 - AKR 30H 800 AMP CONTACT STR U CTURES...
  • Page 116 SECTION 8-Contact Maintenance (Cont.) C ON TACT A D J U STM ENT ­ AKR30L, A K R50/50H & A K R U 50 5. Attach a continuity checker (bell-set, light, or ohm­ The contact breaker shown i n F i g . 47 is used by meter) between the upper and lower stud.
  • Page 117 CONTACT ADJUSTMENT­ AKRT 50/SOH 1 . Open the breaker. The contact structure shown in Fig. 48 is used by all AKRT 50 breaker types. This structure is similar to the AKR 2 . Arrange the breaker tor slow-closing. 50 structure. There are two movable contact arms, each 3.
  • Page 118 SECTION 8-Contact Maintenance (Cont.) 8 . 5 STATI ONARY CONTACT I DE NTIFIC AT I O N T h e stationary arc i n g , i ntermediate, a n d m a i n contacts each have a d i fferent function d u r i n g cu rrent con d u ction and c u rrent i nterruption .
  • Page 119 8 . 6 CONTACT R E P LAC E M E NT­ 8. 7 CONTACT R EP LACEMENT- AKR 30L, AKA 30/30H/30L & AKRU 30 AKR 50/SOH , AKRU 50 & AKRT 50 Refer to Stationary Contact Identif ication , Section 8.5 Refer to Stationary Contact Identification, Section 8.5, before replacing any stationary contacts.
  • Page 120 SECTION 8-Contact Maintenance (Cont.) FIG. SOB - ARC RU N N ER REMOVED FIG. SOC - ARCING CONTACT PIVOT REMOVED...

  • Page 121: Fuse Sizes And Mounting

    SECTION 9-Fused Breakers S P ECIAL 2500A FUSE FOR AKRU-50 There are two types of fused breakers; AKRU 30, 800 ampere frame and AKRU 50, 1 600 ampere frame. Except This fuse provides a melti ng time-current characteristic for the open fuse lockout device and the i ntegrally­ that coordinates with 1 600A trip devices.
  • Page 122 CAUTION : WHEN REPLACING THE F U S E I N THE LEFT POLE (FRONT VIEW) O F THE BREA KER, SECTION 9-Fused Breakers (Cont.) NO TE PA R TI C UL A R L Y THA T THIS F U S E I S MOUN TED DIFFERENTL Y THAN THE O THER TWO FUSES.

  • Page 123: Open Fuse Lockout Device

    SECTION 9- Fused Breakers (Cont.) OPEN FUSE LOCKOUT DEVICE This device automatically trips the fuse breaker if one of the fuses opens. When this happens, the breaker is locked open until the reset button of the phase i nvolved is pushed. The breaker should not be reclosed , of course, u ntil the opened fuse is replaced .
  • Page 124 SECTION 9-Fused Breakers (Cont.) ARMAT U R E R E S ET BUTION FIG. 56A-DETAILS FIG. 568-INSTALLED TYP E A OR 8 B R EAKER OFLO DEVICE...

  • Page 125: Type Sst Overcurrent Trip Device

    SECTION 1 0-Type SST Overcurrent Trip Device The SST is a solid-state, direct-acting, self-powered trip - - - - - device system . The SST system consists of the SST pro­ grammer unit, current sensors, and a flux shifter trip de­ OYERlMD vice .

  • Page 126: Current Sensors

    SECTION 1 0-Type SST Overcurrent Trip Device (Cont.) M O U N T I N G BRACKET -... .. FIG. 59 - AKR-58-30 1 0.2 C U R R ENT S ENSORS The SST system uses two types of current sensors, a phase sensor and a ne utral sensor.
  • Page 127 B R E A K E P ­ MOU N T E D FIG. 60 SST PHASE SENSOR WITH TAP BOARD E Q U I P MENT ­ MOUNTED 600 - 1 600 300 - eoo SHORTING STRAP FIG. 62 N EUTRAL SENSOR 1 0 0 - 3 0 0 SECONDARY DISCONN ECT...

  • Page 128: Replacement Of Current

    1 0.2.1 REPLAC E M ENT O F C U R R ENT S E N SO R S d) When replac i n g the stud con nector, tig hten the Referri n g to F i g . 63, rep l acement o f i n d iv i d u al SST ±...
  • Page 129 So long as the act u ator rem a i n s i n the Reset posi­ 1 . Remove t h e f l ux s h i fter leads f rom t h e h arness. tion, the b reaker can be c l o sed and opened n o rmal l y 2.
  • Page 130 SECTION 1 0-Type SST Overcurrent Trip Device (Cont.) Bottom view Top view 1 . Actuator 4 . Trip shaft 2 . Trip rod adjuster end 5 . A ctuator arm 3 . Trip paddle 6 . Reset linkage FLUX S H I FT TRIP DEVIC E COMPON ENTS FIG.

  • Page 131: Troubleshooting

    1 0.4 TROUBLESHOOTING W h e n malfu nction ing i s suspected t h e fi rst step i n b) using the Ground Fault Defeat Cable as shown troubleshoot ing is to exam i ne t h e c i rc u it breaker a n d its in Fig.

  • Page 132: Sst Test Set

    SECTION 1 0-Type SST Overcurrent Trip Device {Cont.) 1 0.4.1 SST TEST SET 1 0.4.2 R ES ISTANCE VAL U ES The TAK-TS1 and TAK-TS2 Test Sets are portable in­ stru m ents des ig ned for field-checking the t i m e-cu rrent For use in troubleshooting, the Com mon to Tap resist­...

  • Page 133: 0.4.3 False Tripping-Br Eakers

    1 0.4.3 FALSE TRIPPING-BR EAKERS EQUIPPED WITH G RO U N D FAU LT c) Verify that the harness connections to the sensors When nuisance tripping occurs on breakers equipped meet the polarity constraints i ndicated by the cabling dia­ with the G round Fault trip element, a probable cause is the gram, i .

  • Page 134: Trip Device

    SECTION 1 0-Type SST Overcurrent Trip Device - - - -- q, B q, c PROGRAMMER FLUX SHIFT UNIT TRIP DEVICE BREAKER (48V. de) BACK FRAME � (TO SCR ANODE) LEFT POLE CURRENT WHITE SENSOR BLACK WHITE BLACK WHITE BLACK _ _ _ _ _ HARNESS CON NECTOR...
  • Page 136 SST, see Fig. 74. 3. Neutral sen sors are not req u i red becau se there is no G round Fau l t fu nction.
  • Page 137 TABLE 9 ECS TRIP CHARACTERISTICS Trip Rating ECS PROGRAMMER ADJUSTMENT RANGE (Set Points) in Amperes • Sensor Rating Long Time Short Time - - - - - - Frame ® ® Instantaneous Breaker Size • Pick Time Pickup Time Pickup Type Sensor (Amperes)

  • Page 138: M Icroversatri P '" Trip D Evice

    SECTION 1 2- MicroVersaTrip ™ Trip Device 1 2.1 .1 FAU LT TRIP I N DICATORS The M ic roVersaTri p is a solid-state , d i rect-act i n g , self-powered tri p device system . T h e M icroVersaTrip The optional fault trip indicators are similar to the SST system consist s of the M ic roVersaTr i p p rog ram mer, indicators.

  • Page 139: Microversatrip� Installation

    The remote fault ind ication switch leads are brought out the bottom of the M icroVersaTrip program mer as shown in Fig . This switch lead harness is pl ugged i nto the mati ng con nector on the breaker, see Fig . 79. The switch leads are brought out from the breaker through the Program mer Secondary Discon nect shown in Fig .

  • Page 140: 2.2 Current Sensors 60

    SECTION 1 2- MicroVersaTriprM Trip Device (Cont.) 1 2.2 C U R R ENT SENSORS The tapped and fixed phase sensors have a polarity as­ The cu rrent sensors su pply the power and signal in­ sociated with their windings. Their COMMON terminal is the put necessary to o perate the trip system .
  • Page 141 TAB L E 1 1 TRIP FU NCTIONS AVAILABL E ADD TO BASIC FUNCTIONS BASIC FUNCTIONS Z1 -or-Z2-or-Z STD.-or-5-or-H-or-M G-or-GR A 1 -or-A2-or-A3-or-A • Adjustable Current Setti ng • Adj Long-Time Pickup • LONG Adj Long-Time Delay • TIME • Remote Long-Time Timing Light •...
  • Page 142 SECTION 1 2- Micro Versa Trip Trip Device (Cont.) TAPPED FIG. 83 - M I C ROVERSAT R I PTI'' PHASE FIG. 85 - TYPICAL N E UTRAL S ENSOR SENSORS A M P E R E RATING CONNECTIONS FIG. 84 - 'H'-OPTION P HASE SENSOR...

  • Page 143: 2.2.1 Replacement Of Current

    Si nce t h e neutral sensor i s m o u n ted separately from the breaker, a d i scon nect means i s req u i red to con nect its o u t p u t to the b reaker. F i g . 86 shows the b reaker and eq u i pment mou nted 4th w i re secon dary d i scon nect u sed w i t h the M i c roVersaTri p syste m .

  • Page 144: Flux Shi Fter Trip Device

    SECTION 1 2- MicroVersaTriprM Trip Device (Cont.) 1 2.3 FLUX SHI FTER TRIP DEVICE Once it has been establ ished that the circuit breaker can be opened and closed normally from the test position, The only difference between the MicroVersaTrip and attention can be directed to the trip device proper.

  • Page 145: Resistance Values

    SECTION 1 2- MicroVersaTrip ™ Trip Device (Cont.) 1 2.4.2 FALSE TRIPPING- B R EAKERS EQU I P P E D WITH G ROU ND FAU LT When n u isance tri pping occu rs on breakers eq u i p ped with the G round Fault tri p element, a p robable cause is the existence of a false "g round"...
  • Page 146 SECTION 1 2- MicroVersaTrip ™ Trip Device (Cont.) 1 2.5 CABLI N G DIAG RAM S � B 4> C �A PROGRAMMER A. A. .A -- -- -- FLUX SHIFT UNIT r "f - 1- t - 1 TRIP DEVICE :�...
  • Page 147 PROGRAMMER FLUX SHIFT UNIT TRIP DEV I CE �- - - - - - HARNESS PR O GR AMMER CO NN EC TOR CO N NE CT OR AM P 1 -35 0 35 6 -9 EQUIPMENT -MOUNTED NEUTRAL SENSOR 4-WIRE LOAD FIG.

  • Page 148: Testing

    & & SECTION 12- MicroVersaTrip™ RMS-9 Epic MicroVersaTrip™ Device (Cont.) BREAKER PROGRAMMER GROUND FAULT DEFEAT M O D U LE HARNESS U N IT CAT. NO. TVTGD9 CONNECTOR , - - --, � I I o-+-< r -t I o-+-< �...
  • Page 149 PROGRAMMER REMOTE FAULT MICRO-VERSA TRIP SECONDARY INDICATION PROGRAMMER DISCONNECT CONNECTOR EQUIPMENT BREAKER - - - - - YELLOW OVERL OAD SHORT CIRCUIT GREEN GREEN BLUE OVERLOAD BLUE PICKUP _ _ _ _ 1 -35024 6 -9 1 -350239-9 1 - 350 242 -9 1 -350235-9 FIG.
  • Page 150 & SECTION 1 3-RMS-9 E p ic MicroVersaTri p ® 1 3.1 .1 FAULT TRIP INDICATORS The RMS-9/Epic M ic roVersaTri p® is a solid-state, d i ­ rect-acting, self-powered t r i p device system. The RMS-9 The optional fault tri p indicators are similar to the system consists of the RMS-9 programmer, current sen­...
  • Page 151 & SECTIO N 1 3-RMS-9 Epic M icroVersaTrip® {Cont. ) 1 3.2 CURRENT SENSORS The current sensors supply the power and signal i nput n ec essary to o p erate the t r i p syst e m . L i ke t h e M icroVersaTrip '), t h e RMS-9 and Epic MicroVersaTrip(' uses a phase and neutral sensor.
  • Page 152 & SECTIO N 1 3- RMS-9 Epic M icroVersaTrip ® TAB L E 1 1 TRIP FUNCTIONS AVAILABLE BASIC FUNCTIONS ADD TO BASIC FUNCTIONS G-or-GR A 1 -or-A2-or-A3-or-A Z1 -or-Z2-or-Z STD.-or-5-or-H-or-M • Adjustable Current Setting • Adj Long-Time Pickup • LONG Adj Long-Time Delay •...
  • Page 153 FIG. 1 03 - TYPICAL N EUTRAL SENSOR Fig. 1 03 shows the neutral sensor. The neutral sensor is required when integral ground fault protection is used on single phase-three wire or three phase-four wire sys­ tems. It is inserted into the neutral conductor and therefore is separately mounted in the cable or bus com partment.
  • Page 154 Socket P I N Zone In p uts Zone PROGRAMMER Selective FLUX SHIFT UNIT �-- - - - � TRIP DEVICE Interlock Zone Out p uts S p are E p ic � � ��� �6� 6 PRO GRA MM ER CON NE CTO R EOUIPM AMP 1-350356 -9...
  • Page 155 SECTION 1 4-MicroVersaTrip® Plus and M icroVersaTrip® PM Trip U nits The MVT-Pius/MVT-PM is a sol id-state d i rect-acting self-powered trip device system . The system consists of the MVT- Plus/MVT- PM programmer, current sensors and a flux sh ifter trip device. Figure 1 1 0 shows location of features on programmer.
  • Page 156 SECTION 1 4-MicroVersaTrip ® Plus and MicroVersaTrip® PM Trip Units 1 4.2 TESTING Testing of M icroVersaTrip® Plus and MicroVersaTri p® PM tri p un its may be performed with the trip unit installed in the circuit breaker, the rating plug installed in the tri p unit, and the breaker carrying current.
  • Page 157 SECTIO N 1 4-M icroVersaTri pTM Plus and M icroVersaTripT\1 PM Trip Un its 1 4.4 TRIP UNIT REMOVAL AND REPLACEMENT Socket The programmer m o u nts to the u p per l eft of the breaker Class 1 1 5 . as shown in F i g .
  • Page 158 SECTION 1 4-MicroVersaTrip® Plus a nd M icro Versa Trip® PM Trip Units TAPPED COMMON TERM I NAL FIG. 1 1 5 FIG. 1 1 6 1 4.5 PHASE C U RRENT SENSORS The fixed phase sensors are available with an additional winding.
  • Page 159 SECTIO N 1 4-MicroVersaTrip® Plus and M icroVersaTrip® PM Trip Units 1 4.7 RATING PLUG REMOVAL AND RE­ 1 4.6 NEUTRAL C U RRENT SENSORS PLACEMENT CAUTION: Neutral current sensors are req uired for three­ phase, four-wire systems . When the trip u n it is con nected CAUTION: Removal of the rating plug while the breaker to a three-phase, three-wire system, the neutral sensor is carrying current reduces the breaker's current-carrying...
  • Page 160 SECTION 1 4-MicroVersaTrip® Plus and M icroVersaTrip® PM Tri p Units 1 4.8 TRIP U N IT FUNCTIONS - G round-fault protection, with or without 1 2T M icroVersaTri p® P l us and M icroVersaTrip® PM tri p units have specific standard and o ptional fu nctions.
  • Page 161 SECTIO N 1 4-MicroVersaTrip® Plus and M icroVersaTrip® PM Trip Units 1 4.9 TROUBLE-SHOOTI NG G U I D E The following g u i d e is provided for trouble-shooting and isolating common problems. It does not cover every possi ble condition .
  • Page 162 TABLE 23 SH U NT TRIP AND UNDERVOLTAGE DEVICE OPERATING C U R RENTS SHUNT TRIP UNDER VOLTAGE 0 .. > O cr� Current Current - ..- G> N (Amps) (Amps) :::l :t: e > Operating Inrush Sealed Inrush Sealed Operating...
  • Page 163 TABLE 25 I N STANTAN EOUS U N DERVOLTAG E DEVICE SETT I NGS COI L MAXI MUM DROP OUT RATI NG PIC K U P VOLTAGE RANGE 7-1 4 24 VDC 1 4-29 48 VDC 38-75 1 25 VDC 1 06 47-93 1 55 VDC...
  • Page 164 , the m a tter s h o u l d be referred to the GE Company.
  • Page 165 GEK-64459C Maintenance Manual Low Voltage Power Circuit Breakers Types AKR-30/50 AKRT-50...
  • Page 166 Low Voltage Power Circuit Brea kers Table of Contents Page Page SECTION 1 SECTION 7 1 .0 INTRODUCTION Aux i l iary Switch 7.6. 1 Replacement 1 . 1 I nspection and Mai ntenance 7.6.2 Adj ustment 1 .2 Renewal Parts Shunt Tri p SECTION 2 7.7.
  • Page 167 Page Page SECTION 1 0 SECTIO N 1 4 1 4 .0 1 0.0 TYPE SST OVERCU RRENT M I C ROVERSATRIP . PLUS AND MIC ROVERSATRI P PM TRIP U N ITS 77 TRIP D EVICE 1 4 . 1 Tri p U nit 1 0 .
  • Page 168 SECTION 1 - lntroduction A basic i nspection should consist of the following: a. Visual Check - Look for dirt, grease or other foreign These instructions provide the mai ntenance procedures material on any breaker parts. Check insulati ng su rfaces and describe the operation of the 800 thru 2000 amp frame for conditions that could degrade i nsulating properties size type AKA low voltage power circuit breakers listed i n...
  • Page 169 TABLE 1 BREAKER MODELS MOU NTING TYPE DRAWOUT FRAME SIZE BREAKER SUB- DEEP FUSED (AMPERES) DESIGNATION AKD-8 STRU CTURE STATIONARY ESCUTCHEON B R EAKER AKD-5 AKR-(*)A 30, 30H AKR-( *) 8 30, 30H AKR- ( * ) D 30, 30H AKR-( *)8 30 , 30H AKR-( *)A 50, SOH 1 600...
  • Page 170 The drawing n um ber appears on the breaker nameplate and can be obtained from GE. FUSED/NON FUSED 2 . 1 FRAME SIZE Fused breakers are identified as either AKAU 30 (800 ampere frame size) or AKAU 50 ( 1 600 ampere frame size).
  • Page 171 FIG. 3 Fused Breaker AKR U-60-30 FIG. 2 - Electrically Operated AKR-70-30 • • RACKING MECHANISM FIG. 4 Orawout B reaker...
  • Page 172 SECTION 2-General Description {Cont.) 2 .5 TRIP DEVICE MOUNTING Type AKA breakers are designed for either drawout or There are several types of soli d-state, direct-acting, self­ stationary mounting. Drawout breakers (See Fig. 4) are powered trip device systems associated with AKA equ ipped with features which make them easy to instal l i n breakers.
  • Page 173 SHORT CIRCUIT RATI NGS Short circuit ratings vary with the applied system vol­ tage. On 240 VAC syste ms they are also dependent upon whether the overcurrent trip device contains an i nstan­ taneous tri p element. See Table 4 . TAB L E 4 - B R EAKER I NTE R R U PTI ON RATI NGS 3$ INTERR U PTION RATING KA RMS SYMM ETRICAL...
  • Page 174 SECTION 3 .0-Stora g e , Safety, 3 . 1 Safety M a i nten ance Each user m ust maintain a safety program for the protec­ tion of personnel, as wel l as other equipment , from the I t i s recom mended that the breaker be put into service potential hazards associated with electrical equipment.
  • Page 175 3 . 2 Maintenance Both long and short term maintenance o f all electrical I nstruction books supplied by manufacturers address equipment is essential for reliabi l ity and safety. Mainte­ com ponents that would normally req uire service or main­ nance programs must be tuned to the specific application, tenance during the useful life of the equipment.
  • Page 176 SECTION Drawout Breaker Interchangeability I n general, drawout breakers of the same type and rating are i nterchangeable in their equi pment compartments ; drawout breakers of different frame sizes are not i nter­ changeable. To prevent inserting the wrong type breaker i nto a drawout compartment, suitable "...
  • Page 177 SECTIO N 1 4-M icroVersaTrip® Plus and M icroVersaTri p® PM Trip Units 1 4.9 TRO U BLE-SHOOTI NG G UI DE The following guide is provided for trouble-shooting and isolating common problems. It does not cover every possi ble cond ition. Contact the Customer Support at 800-843-37 42 if the problem is not resolved by these procedures.
  • Page 178 SECTION 1 5-EC Trip Device Type E C overcurrent trip devices are magnetically The standard EC trip device for breaker frames up to operated, using a series coi l or single conductor, and an 2000 amps is the type EC-2A, see Fig. 1 1 9. An optional trip associated magnetic structure to provide tripping force.
  • Page 179 SECTION 1 5-EC Trip Device (Cont . ) FIG. 1 2 1 OVERC U R R ENT TRIPPING DEVICE - EC-2A...
  • Page 181 SECTIO N 1 5-EC Tri p D evice {Cont.) comes this restraining force, the armature movement is further 1 5.2 SERIES OVERCURR ENT TRIPPING retarded by an escapement mechanism which produces an in­ DEVICE EC-1 verse time delay characteristic. The mechanism is shown on Each series overcurrent tripping device is enclosed in a Fig.
  • Page 182 SECTIO N 1 5-EC Trip Device (Cont . ) 1 5.2.3 INSTANTANEOUS TRIPPING 1 5.3 POSITIVE TRIP ADJUSTMENT (a) Adjustable instantaneous tripping takes place after the Before attempting any checks or adjustments on breaker with magnetic force produced by an overcurrent condition, over­ EC trip devices, the breaker mechanism and trip latch should be checked to assure their proper functioning so that the breaker comes the restraining force of the calibration spring which can...
  • Page 183 SECTIO N 1 5-EC Tri p Device (Cont . ) normal direction, the magnetic flux of the series coil and the 1 5.4 R EVERSE CUR RENT TRIPPING DEVICE magnetic flux of the potential coil produce a torque which tends The device is enclosed in a molded case and is mounted on to rotate the armature counterclockwise.
  • Page 184 SECTIO N 1 5-EC Trip Device (Cont . ) 1 5.4.1 ADJ USTM ENTS 1 5.6 TRIP DEVICE REPLACEMENT & The only adjustment to be made on the reverse current de­ Overcurrent devices on AKR30 AKR50 breakers may be vice is to make sure that the trip rod has a minimum overtravel dismounted by removing the fastening hardware at the rear of of 1 /32 in.
  • Page 185 SECTIO N 1 6-Eiectrical Characteristics 1 8 - Char g in g and Closin g Operatin g Currents TABLE MOTOR ANTI-PUMP CONTROL "W" "X" CLOSING > Current (Amps) RELAY RELAY SOLENOID "' ;;; .., Cl> c; ..C QI .., .., c;...
  • Page 186 TABLE 23 SHUNT TRIP AND UN DERVOLTAG E DEVICE OPERATING CURR ENTS UNDER VOLTAGE SHUNT TRIP > " Current Current 8 � Cll N (Amps) (Amps) � � ij. :r ·- > Inrush Operating Inrush Sealed Sealed Operating Open Closed Voltage range Open Closed...
  • Page 187 TABLE 25 I N STANTAN EOUS UNDERVOLTAG E DEVICE SETTINGS COI L MAXI M U M DROP OUT RATING PIC K U P VOLTAGE RANGE 7- 1 4 24 VDC 1 4-29 48 VDC 1 25 VDC 38-75 1 06 47-93 1 55 VDC 1 32...
  • Page 188 Should furth er information be desired or should particular problems arise which arc not covered sufficien tly fi:lr the purchaser's purposes, th e matter should be referred to the GE Company. GE Electrical Distribution & Control General Electric Company 4 1 Woodford A ve., Plainville, CT 06062...
  • Page 189 ELECTRICAL CLOSING SECTION 5-Breaker Operation On electrically operated brea kers the closing springs are charged by a gear motor. With the springs discharged, voltage appl ied to the control circuit will energize the motor through the " G " switch contacts - see Fig. 9 . The motor, A breaker may be eq u i pped to operate either manually through the gear reduction output crank, compresses the or electrical ly.
  • Page 190 5.2.1 ALTERNATE CONTROL C I RC U IT USED A second type of electrical control is shown i n Fig. 9A equipped) or by a remote closing switch . Operation of the , closing switch energizes the K-relay, which i n turn ener­ for all control voltages except 250 volts D .C .
  • Page 191 M ECHAN ISM O P E RATION Figures 1 OA, 1 OB and 1 OC show the mechan iSm com .. ponents in the C losed, Tri p ped and Reset positions. The closing spring is in the charged position for all of these d etails.
  • Page 192 SECTION 5-Breaker Operation (Cont.) FIG . 1 2 - ROLLER ENGAG ED WITH CLOSING P ROP There is a ratchet asse mbly attached to the camshaft Rotate the camshaft using the m aintenance handle until extension . This ratchet is normally driven by the breaker's the ratchet assembly roller engages with the prop.
  • Page 193 SECTION 6-lnterlocks AKR breakers are equipped with safety interlock devices that are requi red by Industry Standards and Certifying Au­ thoriti es. I nterlock devices for special applications are also avai lable as options. The standard interlock devices de­ scri bed below are used only on drawout breakers. Stati on­ ary breakers have no required interlocks.
  • Page 194 SECTION 6-lnterlocks (Cont.) • I NTERLOCK FIG. FIG. 1 6 - POSITIVE INTERLOCK RACKING SCREW COVER INTERLOCK CLOSED POSITION cran k pin reaches the end of the slot i n the li nkage. Continued motion of the racking mechanism causes the li nkage to rotate the lever which moves the closing sole­...
  • Page 195 DISCONN ECT POSITION I NTER LOCK The function of the D iscon nect Position I nterlock is to block the RACKING SCREW cover open when the racking mechanism is in the D I SCONN ECTED position. When the cover is held open, the T R I P button is depressed. The mechanism is held trip-free and there is no contact arm movement wh en the closing spring is discharged by the Closing Spring interlock.
  • Page 196 SECTION 6-lnterlocks (Cont.) KEY INTERLOCK-STATIONARY When the breaker is in the CLOSED position, the fly­ B REAKER wheel assembly item #2 is away from the lever item #6. The lever is spring loaded and rotates clockwise causing its pin to block the l oc k bolt extension. The function of the Key I nterlock is to prevent an open breaker from being closed when the lock bolt is extended and its key is removed.
  • Page 197 SECTION 7-Breaker Maintenance (Cont.) MANUAL HANDLE ADJ USTM ENT The areas requiri ng l ubrication are: The adjustment li nkage connects the handle assembly to Contacts Pivots - A thin fi l m on the stationary the chain drive mechanism which turns the cam shaft. The and movable contact assembly pivot surfaces.
  • Page 198 SECTION 7 -Breaker Maintenance (Cont.) DRAWO UT M ECHANISM POSITION Remove the hex-head bolt only, do not remove or loosen Maintenance or i nspection should be conducted with the the slotted head screw shown in Fig. 2 1 . Removal of the slotted head will cause the closing spring to become d is­...
  • Page 199 SECTION 7- Breaker Maintenance (Cont.) PRI MARY DISCONN ECTS The 800 ampere breakers use four primary discon nect fingers per terminal. The 1 600 and 2000 ampere breakers Pri mary disconnects are found only on drawout break­ use eight fingers per term inal . Fig. 22 shows a line and ers.
  • Page 200 The GE SB-1 2 replacement switch should have its shown in Fig. 26 . 766" to .797" Note that this di mension...
  • Page 201 ELECTROSWITCH TYPE 1 01 Adjustment i s the same as the GE S B 1 2 except that when the switch "A" contacts touch , the breaker arcing contacts must be within 0 to .250 inches of c losing.
  • Page 202 SECTION 7 -Breaker Maintenance (Cont.) DROPOUT VOLTAGE: � On AC devices the dropout level will fall within the requ i red limits (30 % to 60% of the coil rating) if the picku p is set properly. On DC devices, the d ropout level may need independent adjustment.
  • Page 203 STOP OPEN GAP INSERT W I R E GAGE ADJ USTM ENT ± 005 D I A .201 P I N FIG. 328 - OPEN GAP CHECK FIG. 320 - POSITIVE TRIP CHECK When i nstalled, the voltage to be monitored is connected across term inals No.
  • Page 204 SECTION 7 -Breaker Maintenance (Cont.) 3. Check resis t ance of the disconnected undervoltage device. See Table 5 for values. See i nstruction Sheet G EH-4545 for more detai led infor­ mation, including schematic diagrams and circuit descrip­ tion. The undervoltage device must be cal i brated through the time-delay unit after the device pick up has been adjusted.
  • Page 205 SECTION 7-Breaker Maintenance (Cont.) 7.1 1 .3 REPLACEM ENT The mechanism i s reset by disengaging the side latch l i nk from the upper latch link or by closing the breaker if a The bel l alarm is mounted on the right hand side of the locklever is not provided.
  • Page 206 SECTION 7-Breaker Maintenance (Cont.) 7.1 2.1 COM PON ENT REPLACEM ENT To gain access to the electrical control components, the breaker's front escutcheon m ust be removed. Type B and D breakers requ i re that both the deep molded escut­ cheon and the shal low steel escutcheon be removed.
  • Page 207 F AND G SWITCH ADJ USTMENT 7.1 2.2 For proper electrical operation, the F and G mechani­ cally operated switches must operate at the proper point in the closing cycle. If these switches are to be replaced, measure the distance between the tip of the switch button and the bracket on which they are mounted.
  • Page 208 S E C TI O N 7 - B r e a k e r M a i n t e n a n c e ( C o n t . L U B Ri C A Ti O C O L L A l U B RI C A TI O...
  • Page 209 SECTION 7-Breaker Maintenance (Cont.} BUFFER ASSE M B LY 7. 1 4 When the breaker is closed, the energy in the closing When the breaker is opened, the end plate assembly is " driven against the opposite end of the buffer assembly. spring i s transferred to the main shaft thro u g h the mechanism.
  • Page 210 SECTION 7-Breaker Maintenance (Cont.) NEOPRENE WAS H E RS 7 . 1 4. 1 B U FFER ADJ USTME NT Referring to !=ig. 40, with the breaker c losed and the mechanism not reset, a . 005 " c learance must exist be­ tween the end p late assembly and the buffer nut as shown.

  • Page 211: Arc Chute Removal

    SECTION 8-Contact Maintenance ARC CHUTE REMOVAL AND INSPECTION Breakers subjected to frequent i nterruption of high cur­ There are two types of arc chute construction used on rents may eventually req uire replacement of their contacts . the 800 thru 2000 ampere breakers. They are the cerami c The general rule for determi ning need of replacement is type shown i n Fig.
  • Page 212 SECTION 8-Contact Maintenance (Cont.) CONTACT ADJUSTM ENT ­ AKR 30/30H & AKRU 30 The contact structure of the AKR 30 and the AKRU 30 breakers is slightly different from the AKR 30H. Referring to Fig. A & B, both structures use one moveable contact arm, and two stationary arcing contacts.
  • Page 213 SECTION 8-Contact Maintenance (Cont.) FIG. 44A - AKR30, AKRU30 FIG. AKR 30H 800 AMP CONTACT STR U CTU R ES...
  • Page 214 SECTION 8-Contact Maintenance (Cont.) & CONTACT ADJUSTM ENT ­ AKRU 50/SOH The contact structure shown in Fig. 47 is used by all 5. Attach a conti nuity checker (bell-set, light, or ohm­ AKR50 breaker types. This structure uses two movable meter) between the upper and lower stud.

  • Page 215: Contact Adjustment

    CONTACT ADJUSTMENT­ AKRT 50/SOH 1 . Open the breaker. The contact structure shown in Fig. 48 is used by all AKRT 50 breaker types. This structure is similar to the AKR 2. Arrange the breaker for slow-closing. 50 structure. There are two movable contact arms, each acting against single stationary arcing and intermediate 3 .
  • Page 216 SECTION 8-Contact Maintenance (Cont.) STATIONARY CONTACT I DENTI FICATION The stationary arcing, intermediate, and main contacts each have a different function d uring current conduction and current i nterruption. For this reason, these contacts are made using different material compositions. Also, the different functions require that the contacts be replaced in configurations shown i n Figs.

  • Page 217: Aka 30/30H & Akru 30

    CONTACT R EPLACEM E NT­ CONTACT R E P LACEMENT- AKA 30/30H & AKRU 30 AKA 50/SOH , AKRU 50 & AKRT 50/SOH Refer to Stationary Contact Identification , Section 8.5 Refer to Stationary Contact Identification, Section 8.5, before replacing any stationary contacts. before replacing any stationary contacts.
  • Page 218 SECTION 8-Contact Maintenance (Cont.) FIG. SOB - ARC RU N N ER REMOVED FIG. SOC - ARC I N G CONTACT PIVOT REMOVED...

  • Page 219: Fused Breaker

    SECTION 9-Fused Breakers There are two types of fused breakers ; A K R U 30, 800 SPECIAL 2500A FUSE FOR AKRU-50 am pere frame and AKRU 50, 1 600 ampere frame. Except This fuse provides a melting time-current characteristic for the open fuse lockout device and the i ntegrally­...
  • Page 220 CAUTION: WHEN REPLACING THE FUSE I N THE LEFT POLE (FRONT VIEW) OF THE B REAKER, SECTION 9-Fused Breakers (Cont.) N O TE PA R TI C UL A R L Y THA T THIS F U S E I S MOUNTED DIFFERENTL Y THAN THE O THER TWO FUSES.

  • Page 221: Open Fuse Lockout Device

    SECTION 9- Fused Breakers (Cont.) OPEN FUSE LOCKOUT DEVICE This device automatically trips the fuse breaker if one of the fuses opens. When this happens, the breaker is locked open until the reset button of the phase involved is pushed . The breaker should not be reclosed, of course, until the opened fuse is replaced.
  • Page 222 SECTION 9-Fused Breakers (Cont.) ARMAT U R E RESET BUTTON FIG. 56A-DETAILS FIG. 568-I NSTALLED TYPE A OR B B R EAKER OFLO DEVICE...
  • Page 223 SECTION 1 0-Type SST Overcurrent Trip Device �- - - - - - The SST is a s o l i d-state, d i rect-acti n g , self-powered trip device syste m . The S S T system consists of t h e SST pro­ grammer u n it, c u rrent sensors, a n d a flux sh ifter t r i p de­...
  • Page 224 SECTION 1 0-Type SST Overcurrent Trip Device (Cont.) M O U N T I N G � BRACKET FIG. 59 - AKR-58-30 1 0.2 C U R R ENT S ENSORS The SST system uses two types of cu rrent sensors, a phase sensor and a neutral sensor.
  • Page 225 B R E A K E F' ­ M O U N T E D FIG. 60 - SST PHASE S ENSOR WITH TAP BOA R D EQUI PME N T ­ MOU N TED 600 - 1 600 FIG. 62 - N EUTRAL SENSOR 10 0 - 3 00 SECONDARY DISCONNECT FIG.
  • Page 226 1 0. 2 . 1 R E P LAC EM ENT O F C U R R E NT S E N SO R S d) When re p l ac i n g t h e stud connector, t i ghten t h e Referri ng t o F i g .
  • Page 227 So long as the act u ator re m a i n s i n the Reset posi­ 1 . Remove t h e flux s h i fter leads from the h arness. tion, the b reaker can be c l osed and opened norm a l l y 2 .
  • Page 228 SECTION 1 0-Type SST Overcurrent Trip Device (Cont.) Bottom view Top view 1 . A ctuator 4 . Trip shaft 2 . Trip rod adj uster end 5 . Actuator arm 3 . Trip paddle 6 . Reset linkage FIG. 65 - F LUX S H I FT TRIP DEVICE COMPON ENTS T R I P PAJDLE IN "...
  • Page 229 1 0.4 TROUBLESHOOTI N G When malfunctioning i s suspected t h e fi rst step i n b) using the Ground Fault Defeat Cable as shown troubleshooti n g i s t o exam i ne the c i rc u i t breaker and its in Fig.
  • Page 230 SECTION 1 0-Type SST Overcurrent Trip Device (Cont.) 1 0.4.1 SST TEST SET 1 0.4.2 R ES ISTANCE VAL U ES The TA K-TS1 and TA K-TS2 Test Sets are portable in­ struments desig ned for field-checking the t i me-cu rrent For use in troubleshooting, the Common to Tap resist­...
  • Page 231 1 0.4.3 FALSE TRIPPI NG-B R EAKERS EQUIPPED WITH G RO U N D FAU LT c) Verify that the harness connections to the sensors When nuisance tripping occurs on breakers equi pped meet the polarity constraints i ndicated by the cabling dia­ with the G round Fault trip element, a probable cause is the gram, i .
  • Page 232 SECTION 1 0-Type SST Overcurrent Trip Device cp S cp C - - - - PROGRAMMER FLUX SHIFT U N IT TRIP DEVICE BREAKER � BACK FRAME (48V. (TO SCR ANODE) LEFT POLE CURRENT WHITE SENSOR BLACK WHITE BLACK WHITE BLACK HARNESS PR O GR AM ME R...
  • Page 234 SECTION 1 1 -Type ECS Overcurrent Trip Device The ECS is a so l id-state, d i rect-act i n g , sel f-powered trip devi ce system . The ECS system consi sts of the ECS p rog rammer u n i f shown in Fig. 72, cu rrent sensors, and a flux s h i fter trip device.
  • Page 235 TABLE 9 ECS TRIP CHARACTERISTICS Trip Rating ECS PROGRAMMER ADJUSTMENT RANGE (Set Points) in Amperes • Sensor Rating Long Time Short Time Frame ® ® Instantaneous Breaker Size Pick (•L) Time Pickup Time Pickup Type Sensor (Amperes) Delay Delay Am � ere Multiple Band Multiple...
  • Page 236 SECTION 1 2- MicroVersaTrip Trip Device FAU LT TRIP IN DICATORS 1 2. 1 . 1 The M i c roVersaTri p is a solid-state , d i rect-acti n g , self- powered trip device system . The M icroVersaTri p The optional fault trip indicators are similar t o t h e SST system consists of the M icroVersaTri p p rog rammer, indicators.
  • Page 237 The remote fault indication switch leads are brought out the bottom of the MicroVersaTrip program mer as shown in Fig. 78. This switch lead harness is plugged into the mating connector on the breaker, see Fig. 79. The switch leads are brought out from the breaker through the Programmer Secondary Disconnect shown in Fig.
  • Page 238 SECTION 1 2- MicroVersaTrip™ Trip Device (Cont.) 1 2.2 C U R R ENT SENSORS The tapped and fixed phase sensors have a polarity as­ sociated with their windings. Their COMMON terminal is the The cu rrent sensors supply the power and signal in­ put necessary to operate the trip system .
  • Page 239 TAB L E 1 1 TRIP FUNCTIONS AVAI LAB LE BASIC FUNCTIONS ADD TO BASIC FUNCTIONS G-or-G R A 1 -or-A2-or-A3-or-A Z1 -or-Z2-or-Z STD.-or-5-or-H-or-M • Adjustable Current Setti ng • Adj Long-Time Pickup • LONG Adj Long-Time Delay • TIME •...
  • Page 240 SECTION 1 2- M icro Versa Trip Trip Device (Cont.) TAPPED COMMON TER M I NAL FIG. 83 - M I C ROVERSATRI Pr"' PHASE FIG . 85 - TYPICAL N EUTRAL SENSOR SENSORS AMPERE RATING CONNECTIONS FIG . 84 - 'H'-O PTION PHASE SENSOR...
  • Page 241 S i n ce t h e neutral senso r is m o u n ted separately from the b reaker, a d i sconnect means i s req u i red to con nect its o u t p u t to the breaker. Fig. 86 s hows the b reaker and e q u i pment m o u nted 4th w i re second ary d i scon nect u sed w i t h t h e M i c roVersaTri p system.
  • Page 242 SECTION 1 2- MicroVersaTrip™ Trip Device (Cont.} 1 2.3 FLUX S H I FTER TRIP DEVICE Once it has been establ ished that the circuit breaker can be opened and closed normally from the test position, The only d ifference between the MicroVersaTrip and attention can be di rected to the tri p device proper.
  • Page 243 SECTION 1 2- Micro Versa Trip Trip Device (Cont.) 1 2.4.2 FALSE TRI PPI NG-B R EAKERS EQU I PP E D WITH G R O U N D FAU LT When nu isance tripping occu rs on breakers equipped with the G round Fault trip element, a p robable cause is the existence of a false "g round"...
  • Page 244 SECTION 1 2- MicroVersaTrip ™ Trip Device (Cont.) 1 2.5 CABLI N G DIAG RAM S cp A ci> C PROGRAMMER A- A- A­ FLUX SHIFT U N IT r 1 -[-t - 1 TRIP DEVICE :� � � � � � �- - - - - - �...
  • Page 245 A A A PROGRAMMER FLUX SH I FT UNIT r 1 -t - t- l TRIP DEV I CE �- - - - - , : � � � � ; � � }= = =)===)= LEFT POLE CURRENT SENSOR NEUTRAL SENSOR - - 1...
  • Page 246 & & SECTIO N 12- MicroVersaTrip ™ RMS-9 Epic MicroVersaTrip™ Device (Cont.) BREAKER PROGRAMMER GROU N D FAULT DEFEAT M O D U LE HARNESS UNIT CAT. NO. TVTGD9 CONNECTOR � I crt-< � I o-+-< � o---t- -< I o--1- --< �...
  • Page 247 PROGRAMMER REMOTE FAULT MICRQ-VERSA TRIP SECONDARY INDICATION PROGRAMMER DISCONNECT CONNECTOR EQUIPMENT BREAKER - - - -- - YELLOW OVERLOA D SHORT CIRCUIT GREEN GROU ND GREEN FAULT BLUE OVERLOAD BLUE PICKUP _ _ _ _ _ _ 1 -35024 6- 9 1 -350242-9 1 -3502 35 -9 1 -350239-9...
  • Page 248 & SECTION 1 3-RMS-9 E p ic MicroVersaTri p ® 1 3.1 .1 FAULT TRIP I N DICATORS The RMS-9/Epic MicroVersaTri p® is a sol id-state, di­ rect-acting, self-powered tri p d evice system. The RMS-9 The optional fau lt trip indicators are similar to the system consists of the RM S-9 programmer, cu rrent sen­...
  • Page 249 & SECTIO N 1 3-RMS-9 Epic MicroVersaTrip® (Cont . ) 1 3.2 CURRENT SENSORS The current sensors supply the power and signal i n put nec essary to o p erate the tri p system . L i k e the M icroVersaTrip"' , the RMS-9 and Epic MicroVersaTri p ' uses a phase and neutral sensor.
  • Page 250 & SECTION 1 3-RMS-9 Epic MicroVersaTrip® TAB L E 1 1 T R I P FU NCTIONS AVAILABL E BASIC FUNCTIONS ADD TO BASIC FUNCTIONS STD.-or-S-or-H-or-M G-or-GR A 1 -or-A2-or-A3-or-A Z1 -or-Z2-or-Z • Adjustable Current Setting • Adj Long-Time Pickup •...
  • Page 251 FIG. 1 03 - TYPICAL N EUTRAL SENSOR Fig. 1 03 shows the neutral sensor. The neutral sensor is req uired when i ntegral grou nd fault protection is used on single phase-three wire or three phase-four wire sys­ tems. It is inserted into the neutral conductor and therefore is separately mounted in the cable or bus compartment.
  • Page 252 & SECTIO N 1 3-RMS-9 Epic M icroVersaTrip ® Device (Cont . ) 2 . Test the components of the R MS-9 system using Since the neutral sensor is mounted separately from the portable Test Set Type. The applicable test procedures breaker, a d iscon nect means is required to connect its are detailed in i nstruction Book G E K-97367.
  • Page 253 1 3.4.2 FALSE TRIPPING - BREAKERS 1 3.5 CABLING DIAGRAMS EQU IPPED WITH GROUND FAULT FLUX SHIFT q, s q, c UNIT PROGRAMMER ;__ ;__ ;__ When nu isance tripping occurs on b reakers eq uipped r t - 1- t- 1 TRIP DEVICE - - - - , t �...
  • Page 254 Socket P I N N o . Zone Zone Inputs PROGRAMMER Selective �- - - - - FLUX SHIFT UNIT TRIP DEVICE Interlock Zone Outputs Spare Epic -"i ��� ��ig 1-3503 56 - 9 PROGRAMMER CON NE CTO R 24 Ret NEUTRAL SENSOR 4 - WIRE LOAD 24 VDC...
  • Page 255 PM trip units req uire external 24 Vdc control power for MicroVersaTrip® P M trip u nits communicate d i rectly on operation. The fou r sources of such power are the the GE POWER LEADER'" communications bus. following. • Breaker current sensors provide...
  • Page 256 SECTION 1 4-MicroVersaTrip® Plus and MicroVersaTrip® PM Trip U nits 1 4.2 TESTING Testing of M icroVersaTrip® Plus and M icroVersaTrip® P M tri p units may be performed with the tri p unit installed in the circuit breaker, the rating plug installed in the trip unit, and the breaker carrying c urrent.
  • Page 257 SECTION 1 4-MicroVersaTrip™ Plus and M icroVersaTrip™ PM Trip U n its 1 4.4 TRIP UNIT REMOVAL AND REPLACEMENT Socket The programmer mounts to the u pper left of the breaker Class as shown in Fig. 1 1 5 . It mounts to the bracket assembly shown in Fig.
  • Page 258 SECTION 1 4-MicroVersaTrip® Plus and MicroVersaTrip® PM Trip U nits TAPPED FIG. 1 1 5 FIG. 1 1 6 1 4.5 PHASE C U RRENT SENSORS The fixed phase sensors are avai lable with an add itional winding. Th is winding is brought out to separate flag The current sensors supply the power and signal input term inals.
  • Page 259 SECTIO N 1 4-MicroVersaTrip® Plus and MicroVersaTrip® PM Trip Units 1 4.7 RATING PLUG REMOVAL AND RE­ 1 4.6 NEUTRAL C UR RENT SENSORS PLACEMENT CAUTION: Neutral current sensors are requ i red for three­ phase, four-wire systems. When the trip unit is connected CAUTION: Removal of the rating plug while the breaker to a three-phase, three-wire system, the neutral sensor is carrying current reduces the breaker's current-carrying...
  • Page 260 SECTIO N 1 4-MicroVersaTrip® Plus and M icroVersaTrip® PM Trip U nits 1 4.8 TRIP U NIT FUNCTIONS - Grou nd-fault protection, with or without 1 2T MicroVersaTrip® Plus and MicroVersaTrip® P M trip units have specific standard and optional functions. All trip - Zone-selective interlock, with g round fault only units share a series of interchangeable rating plugs.

This manual is also suitable for:

Akr-50 seriesAkrt-50 seriesAkr a 30 seriesAkr a 30h seriesAkr b 30 seriesAkr b 30h series ... Show all

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