LS Industrial Systems SV-iS7 Series Troubleshooting Manual
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LS Industrial Systems SV-iS7 Series Troubleshooting Manual

Ac variable speed drive
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0.75~75kW(200V), 0.75~375kW(400V)
AC Variable Speed Drive
iS7 Troubleshooting
Safety Instructions
Read this manual carefully before servicing or inspecting this equipment.
Keep this manual within easy reach for quick reference.
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  • Page 1 0.75~75kW(200V), 0.75~375kW(400V) AC Variable Speed Drive iS7 Troubleshooting Manual Safety Instructions Read this manual carefully before servicing or inspecting this equipment. Keep this manual within easy reach for quick reference.
  • Page 2 Quick Reference Table The following table contains situations frequently encountered by users while working with inverters. Refer to the typical and practical situations in the table to quickly and easily locate answers to your questions. Situation Reference The motor is too noisy. P.

  • Page 3: Table Of Contents

     INTRODUCTION Manual Composition  PRODUCT IDENTIFICATION  ASSOCIATION MANUAL  SAFETY INFORMATION  REVISION RECORD Contents 1 BASIC CHECKLIST 1.1 Before You Think It Is Failure 1.2 Basic Operations 1.3 Parameter Change 1.3.1 Carrier Frequency Change 1.3.2 Initializing All Parameters 1.3.3 Read and Write Parameters 1.4 Fault Trip Monitoring 2 TROUBLESHOOTING...

  • Page 4: Introduction Manual Composition

    Introduction Manual Composition 1 Basic Checklist 1.1 Before You Think It Is Failure When the problem of inverter occur, 1.2 Basic Operations you can check the basic checklist before you think it is failure in these 1.3 Parameter Change pages. 1.3.1 Carrier Frequency Change 1.3.2 Initializing All Parameters check the set-up of parameter using...

  • Page 5: Product Identification

    Product Identification Model name Power source specifications Output specifications Motor capacity Series name Input voltage 2-3 상 200~230[V] 4-3 상 380~480[V] Loader N : No Loader S : Graphics Loader Association Manual iS7 user manual can be download through the homepage of LSIS. Link : http://www.lsis.com/support/download/...

  • Page 6: Safety Information

    Safety Information Read and follow all safety instructions in this manual precisely to avoid unsafe operating conditions, property damage, personal injury, or death. Safety symbols in this manual Danger Indicates an imminently hazardous situation which, if not avoided, will result in severe injury or death. Warning Indicates a potentially hazardous situation which, if not avoided, could result in injury or death Caution...
  • Page 7 Warning  This equipment must be grounded for safe and proper operation.  Do not supply power to a faulty inverter. If you find that the inverter is faulty, disconnect the power supply and have the inverter professionally repaired.  The inverter becomes hot during operation. Avoid touching the inverter until it has cooled to avoid burns.

  • Page 8: Revision Record

    Revision Record Changed main Version Date Association page contents V1.0 2015.07 First edition...

  • Page 9: Basic Checklist

    Basic Checklist 1.1 Before You Think It Is Failure Items Check Point Result Is the installation location appropriate? Installation Does the environment meet the inverter’s operating conditions? Location/ Input/Output Does the power source match the inverter’s rated input? voltage Is the inverter’s rated output sufficient to supply the equipment? Is a circuit breaker installed on the input side of the inverter? Is the circuit breaker correctly rated? Are the power source cables correctly connected to the R/S/T...
  • Page 10 Basic Checklist Items Check Point Result Are STP (shielded twisted pair) cables used for control terminal wiring? Is the shielding of the STP wiring properly grounded? If 3-wire operation is required, are the multi-function input terminals defined prior to the installation of the control wiring connections? Control Are the control cables properly wired? Terminal Wiring...

  • Page 11: Basic Operations

    Basic Checklist 1.2 Basic Operations  Key Functions Refer to the following illustration to identify part names and functions 14. Move Up 1. Cancel(ESC) 13. Program Set 12. Move to Right 2. Move to Left 11. Multi-Function 3. Mode Selection 10.
  • Page 12 Basic Checklist Reverse Key - Motor rotates in reverse direction. - Stop during operating. Stop/Reset Key - Trip release after a trip occurs.
  • Page 13 Basic Checklist  Composition of Display (1) Monitor Mode Operating/Frequency command Multi-function Key Mode Display Inverter Operating Status command Status Display Item Monitor Mode Display Item 1 Monitor Mode Cursor Monitor Mode Display Item 2 Monitor Mode Display Item 3 (2) Parameter change display Group Display Inverter Operating Status...
  • Page 14 Basic Checklist FBus Option frequency command V2, I2 frequency command of sub-terminal block Jog frequency command Internal 485 frequency command 1~9 A~F Sequential frequency command JOG Key Used for shift to Keypad JOG mode Multi Local/Remote Used to select local or remote operation Function Used to register parameters as a user group in the UserGrp...

  • Page 15: Parameter Change

    Basic Checklist 1.3 Parameter Change 1.3.1 Carrier Frequency Change The following example demonstrates how to configure Carrier Frequency by modifying CON group 04 code(Carrier Frequency) from 5.00(Hz) to 10.00(Hz). You can configure the parameters for different codes in any other group in exactly the same way. Step Instruction Keypad Display...
  • Page 16 Basic Checklist Change the Carrier Frequency to 10 using Up key. Press ENT. The display come back to the initialization selection after finishing Carrier Frequency Change Adjust motor operational noise by changing carrier frequency settings. Power transistors (IGBT) in the inverter generate and supply high frequency switching voltage to the motor.

  • Page 17: Initializing All Parameters

    Basic Checklist 1.3.2 Initializing All Parameters You can initialize the parameter that has been changed by the user to the initial state at the time of delivery. Not only the entire parameter but a group of the parameter mode can be selected and initialized. Step Instruction Keypad Display...

  • Page 18: Read And Write Parameters

    Basic Checklist Step Instruction Keypad Display The display come back to the initialization selection after finishing Initialization. Note Following parameter initialization, all parameters are reset to factory default values. Ensure that parameters are reconfigured before running the inverter again after an initialization. 1.3.3 Read and Write Parameters This is the function of copying the parameter saved in the inverter to the keypad and copying the parameter saved in the keypad to the inverter.

  • Page 19: Fault Trip Monitoring

    Basic Checklist 1.4 Fault Trip Monitoring  Failure during operation Step Instruction Keypad Display In case of a failure during operation, the mode automatically shifts to Trip Mode and the type of the current failure is displayed. If you press Down key, the output frequency, current and operating status at the time of the failure occurring are displayed.
  • Page 20 Basic Checklist  Multiple failures at a time Step Instruction Keypad Display In case of multiple failures, the number of failures is displayed next to the failure type. Press PROG. The type of failures is displayed. Press PROG. The display mode before failure checking comes back.
  • Page 21 Basic Checklist  Saving and monitoring of failure history Step Instruction Keypad Display In case of a failure during operation, the mode automatically shifts to Trip Mode with the trip displayed. If you press Reset or the terminal is entered, the failure above is automatically saved and the display goes back to the place before the failure.

  • Page 22: Troubleshooting

    Troubleshooting Troubleshooting This chapter explains how to troubleshoot a problem when inverter protective functions, fault trips, warning signals, or a fault occurs. If the inverter does not work normally after following the suggested troubleshooting steps, please contact the LSIS customer service center. 2.1 Trips and Warnings When the inverter detects a fault, it stops the operation (trips) or sends out a warning signal.
  • Page 23 Troubleshooting Category LCD Display Details Page Over Current2 Trip from ARM short current P.29 Fuse Open Fuse open trip Option Trip-x Option Trip Over Heat Trip from Over heat P.29 Out Phase Open Trip from output phase open P.29 In Phase Open Trip from input phase open P.28 Inverter OLT...
  • Page 24 Troubleshooting Category LCD Display Details Page Emergency stop trip Lost Command Trip from lost command Lost Keypad Trip from lost-keypad EEP Err Exterior Memory Error ADC Off Set Analog Input Error Fatal type Watch Dog-1 CPU Watchdog trip Watch Dog-2 Gate Pwr Loss DRV operation power error Over Load...
  • Page 25 Troubleshooting Category LCD Display Details Page Retry Tr Tune Warning for Tr tuning retrial Fire Mode Warning for working fire function...

  • Page 26: Troubleshooting Fault Trips

    Troubleshooting 2.1.2 Troubleshooting Fault Trips When a fault trip or warning occurs due to a protection function, refer to the following table for possible causes and remedies. LCD Display Type Description Displayed when you select the motor overload failure and the Overload Over Load Latch...
  • Page 27 Troubleshooting LCD Display Type Description Over Displayed when inverter output current exceeds 200% of the Over Current1 Latch Current Trip rated current. Cause Remedy Acc/Dec time is too short, compared Increase Acc/Dec time. to load inertia (GD2). The inverter load is greater than the Replace the inverter with a model that has increased capacity.
  • Page 28 Troubleshooting LCD Display Type Description Displayed when internal DC circuit voltage is less than the Low Voltage Level Voltage trip specified value. Cause Remedy The input voltage is too low. Determine if the input voltage is below the specified value. The actual DC link voltage is Need to inspect hardware.
  • Page 29 Troubleshooting The inverter has been operated Replace the motor with a model that supplies extra power to the at low speed for an extended cooling fan. duration. LCD Display Type Description Displayed when one of the three phases output of the Out Phase Out Phase Open Latch...
  • Page 30 Troubleshooting LCD Display Type Description Over Heat Displayed when the temperature of the inverter heat sink Over Heat Latch Trip exceeds the specified value. Cause Remedy There is a problem with the Determine if a foreign object is obstructing the air inlet, outlet, or vent. cooling system.
  • Page 31 Troubleshooting LCD Display Type Description Displayed when a fault condition occurs in the inverter cooling fan. FAN Trip Fan Trip Latch Operation resumes if PRT-79 is set at 0. Cause Remedy A foreign object is obstructing the Remove the foreign object from the air inlet or outlet. fan’s air vent.

  • Page 32: Troubleshooting Other Fault

    Troubleshooting 2.2 Troubleshooting Other Fault When a fault other than those identified as fault trips or warnings occurs, refer to the following table for possible causes and remedies. Parameters cannot be set. Cause Remedy Stop the inverter to change to program mode and set The inverter is in operation (driving mode).
  • Page 33 Troubleshooting The motor rotates in the opposite direction to the command. Cause Remedy The wiring for the motor output cable is Determine if the cable on the output side is wired incorrect. correctly to the phase (U/V/W) of the motor. The signal connection between the control circuit terminal (forward/reverse rotation) of Check the forward/reverse rotation wiring.
  • Page 34 Troubleshooting The motor stops during acceleration or when connected to load. Cause Remedy Reduce the load. The load is too high. Replace the motor and the inverter with models with capacity appropriate for the load. The motor does not accelerate. /The acceleration time is too long Cause Remedy The frequency command value is low.
  • Page 35 Troubleshooting The motor deceleration time is too long even with Dynamic Braking (DB) resistor connected. Cause Remedy The deceleration time is set too long. Change the setting accordingly. If motor parameters are normal, it is likely to be a motor The motor torque is insufficient.
  • Page 36 Troubleshooting The motor vibrates severely and does not rotate normally. Cause Remedy Check the input voltage and balance the voltage. Phase-to-phase voltage of 3-phase power source is not balanced. Check and test the motor’s insulation. The motor makes humming, or loud noises. Cause Remedy Resonance occurs between the motor's...
  • Page 37 Troubleshooting The output frequency does not increase to the frequency reference. Cause Remedy The frequency reference is within the jump Set the frequency reference higher than the jump frequency range. frequency range. The frequency reference is exceeding the Set the upper limit of the frequency command higher upper limit of the frequency command.

  • Page 38: Maintenance

    3. Maintenance Maintenance This chapter explains how to replace the cooling fan, the regular inspections to complete, and how to store and dispose of the product. An inverter is vulnerable to environmental conditions and faults also occur due to component wear and tear. To prevent breakdowns, please follow the maintenance recommendations in this section.

  • Page 39: Regular Inspection Lists

    3. Maintenance 3.1 Regular Inspection Lists 3.1.1 Daily Inspections Inspection Judgment Inspection Inspection Inspection Judgment standard method standard equipment method equipment Is the ambient No icing (ambient Thermometer, temperature and Refer to temperature: -10 - hygrometer, humidity within the Ambient Installation &...

  • Page 40: Annual Inspections

    3. Maintenance 3.1.2 Annual inspections Inspection Judgment Inspection Inspection Inspection Judgment standard method standard equipment method equipment Megger test Disconnect Must be above 5 (between inverter and MΩ input/output short terminals and and R/S/T/U/V/W earth terminal) terminals, and then measure from each terminal to the DC 500 V Megger...

  • Page 41: Bi-Annual Inspections

    3. Maintenance Inspection Judgment Inspection Inspection Inspection Judgment standard method standard equipment method equipment Is there an error in Test the The circuit must the display circuit inverter output work according to after the sequence protection in the sequence. protection test? both short and open circuit conditions.

  • Page 42: Checking The Input/Output Modules

    3. Maintenance 3.1.4 Checking the Input/Output Modules How to check the diode module and IGBT module (SV0008~0075iS7-2/4 Testing method 1) Disconnect all power cables (R,S,T) and motor output cables (U,V,W) 2) Before testing, check the discharge of electrolytic capacitor (DCP-DCN) 3) When the circuit is open, the DMM indicates a high resistance (several MΩ).
  • Page 43 3. Maintenance How to check the diode module and IGBT module (SV0110~0220iS7-2/4, SV0300iS7~1600iS7-4) Testing method 1) Disconnect all power cables (R,S,T) and motor output cables (U,V,W) 2) Before testing , check the discharge of electrolytic capacitor (DCP-DCN) 3) When the circuit is open, the DMM indicates a high resistance (several MΩ). In some situations the DMM may indicate a closed circuit (low resistance) and then indicate a high resistance due to the capacitors.
  • Page 44 3. Maintenance  Checking the diode module and IGBT module samples Checking the Diode D2 1) Measure the resistance value of D2 by placing the red lead from positive terminal of DMM on S phase and placing black lead from negative terminal of DMM on DCP+ ...
  • Page 45 3. Maintenance Checking the IGBT Tr6 1) Measure the resistance value of Tr6 by placing the red lead from positive terminal of DMM on DCN and placing black lead from negative terminal of DMM on V phase . If the DMM indicates the resistance of several hundred kΩ or less, It is normal 2) Measure the resistance value of Tr6 by placing the red lead from positive terminal of DMM on V phase and placing black lead from negative terminal of DMM on DCN ...

  • Page 46: Replacement Of The Cooling Fan

    3. Maintenance 3.1.5 Replacement of the cooling fan If operation is continued after cooling fan trip occurs, Overheat trip may happen and protective function be activated. It also reduces the life of main components due to rise in inverter inner temperature. When the fan has been operated for an extended duration, the inverter can be damaged or their lifecycle reduced.
  • Page 47 3. Maintenance Replacement of the 11~15kW 200V/400V, 18.5~22kW 400V Fan 1) Remove the screws attaching the fan 2) Remove the fan cover. 3) Disconnect the fan wire and remove the fan. <15kW> Replacement of the 18.5~22kW 200V, 30~75kW 400V Fan 1) Remove the screws attaching the fan 2) Remove the fan cover.

  • Page 48: Storage And Disposal

    3. Maintenance 3.2 Storage and disposal 3.2.1 Storage If you are not using the product for an extended period, store it in the following way: • Store the product in the same environmental conditions as specified for operation • When storing the product for a period longer than 3 months, store it between 10˚C and 30˚C, to prevent depletion of the electrolytic capacitor.

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