Operational Check; Adjustments; Factory Settings - GE AKR-30 Series Maintenance Manual

SECTION 7 -Breaker Maintenance (Cont.)
TRIP PADDLE
ASM

7 . 8 . 2 OPERATIONAL CHECK

(BREAKER WITH UV DEVICE INSTALLED)
Check the pickup and d ropout values at room tempera­
ture. See table 2 5 .
Check t h e positive trip abi lity a s follows:
armature closed, close the breaker. Insert a 0.032
inch shim (wire gage or flat stock) against the armature
open stop (see Fig. 32 D) and release the armature. The
breaker must tri p .
7 . 8 . 3 ADJUSTM ENTS
If the operational checks (7. 8.2) indicate that ad just­
ments are necessary, these procedures should be followed:
verify tri p latch engagement as described in sec­
First
tion 7 . 1 5 , and verify that the trip shaft torq ue requ ired to
tri p a closed b reaker is no g reater than 24 inch-ounces.
Then proceed as follows:
PICKUP VOLTAGE:
The Q.i.Q.!s!,m level is changed by turning the adjustment
screw shown in Fig. 32A. The screw is secured by either
a locking wire or a jam nut inside the frame. Devices with
a jam nut requ ire removal of the device to make this
oq
adjustment. The pickup voltage at room tem peratu re
(approx. 20-24 should be 85 % or less of coil rating and
should be measured at the secondary d isconnects with
the coil energized .
Note:
between the armature and magnet initially to 0. 030 inch
using the closed gap ad justment screw shown in Fig. 32C
before making pickup ad justments.
Be sure to secure the pickup adjustment screw with the
jam nut o r lockwire.
24
MODIFIED
MAINTAIN
BUFFER
THI
ASM
DIMENSION
FIG. 31 - 2ND
UNDERVOLTAGE DEVICE
With the
±
. 005
On DC devices set the gap
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.
after the pickup level has been established per the above
procedure. If requ i red, use the closed gap adjustment
screw shown in Fig. 32C to obtain the d ropout setting. A
gap must remain between the armature and magnet on
DC devices to prevent seal ing in u pon loss of voltage.
Secu re the adjustment screw with the locknut and apply
RTV to the locknut.
POSITIVE TR I P:
Check positive trip ability per 7.8.2. Adjust the trip
paddle screw if necessary to assure positive t ri p . With the
undervoltage d evice closed (picked u p), and the mecha­
nism reset, there m ust be clearance between the trip
p addle and the device armature. If clearance adjustment
necessary, re-verify positive trip ability.
I S
FIG. 32A ­
UNDERVOL TAGE DEVICE

7 . 8 . 4 FACTORY SETTINGS

� This section covers certain factory settings a s an aid to
rouble shooting. They are for reference only, and are not
mtended to be field ad justed. They should not be consid­
ered criteria for acceptance or rejection.
AR MATU RE LOCATI N G RIVET:
The rivet shown in figu re 32A serves as a locater for the
armature. A clearance of 0.001 to 0. 0 1 0 inch should exist
between the rivet and armature as shown in fig. 32A. The
rivet should be able to turn freely.
ARMATU RE OPEN GAP :
The air gap between the armature and the magnet with
�
he d evice d e-energized should be approximately 0.250
mches. This is, checked by inserting a 0.201
d iameter gage pin between the armature and magnet as
shown in Fig. 328.
This is accomplished
.00 1 "
. 0 1 0 "
±
. 005 inch