LS Electric L7NH Drive

LS Electric L7NH Drive Fault Codes:

Fault Code and MeaningCause and Remedy
AL-10
IPM fault (Over current H/W)
Cause:


  • Motor or Encoder cable wiring is incorrect or shorted.

  • Parameter setting error (Motor ID, Encoder type/form).

  • Machine part has a problem (conflict or binding).

  • Drive error or Noise interference.




Remedy:

  • Replace motor or encoder cable.

  • Modify the parameter to match motor label information.

  • Check if the machine part has a problem.

  • If alarm continues, replace drive.

  • Check wiring condition for FG (Frame Ground) and match wire size.
AL-11
IPM temperature (Overheating)
Cause:


  • Ambient temperature is over 50 [°C].

  • Continuous Overload (accumulated load > 100%).

  • High-frequency operation of regenerative drive.

  • Drive setting direction error.




Remedy:

  • Lower surrounding temperature.

  • Change drive and motor capacity or tune gain.

  • Adjust regeneration resistor setting [0x2009] or use external resistor.

  • Refer to wiring and connection manual.

  • If alarm continues, replace drive.
AL-14
Over current (S/W)
Cause:

Check motor phase resistor (U-V, V-W, W-U).



Remedy:

  • Replace motor.
AL-15
Current offset
Cause:

Motor U/V/W phase current offset oversetting (are 5% of rated current or higher).



Remedy:

  • Rerun adjusting phase current offset.

  • If alarm occurs continually after adjusting, replace the drive.
AL-16
Current limit exceeded
Cause:

Drive error or Error by noise.



Remedy:

  • If alarm continues after servo on again, replace drive.

  • Check method to improve noise of wiring/installation.
AL-21
Continuous overload
Cause:


  • Load exceeds rated load during operation.

  • Motor brake is not holding.

  • Parameter setting error (Motor ID, Encoder type).

  • Machine part has binding/conflict.

  • Motor or Encoder cable wiring incorrect/short.




Remedy:

  • Change drive and motor capacity; please tune gain.

  • Provide supply power to motor brake.

  • Modify parameter to match motor label; set proper overload detecting values.

  • Check machine part for problems.

  • Replace motor or encoder cable.
AL-22
Drive temperature 1
Cause:


  • Ambient temperature is over 50 [°C].

  • Drive error (Internal temp sensor deviation).




Remedy:

  • Lower the surrounding temperature of drive.

  • Replace the drive.
AL-23
Regeneration overload
Cause:


  • Capacity excess by high frequency/continuous regenerative operation.

  • Parameter setting error (Regen resistance value).

  • Main power input voltage over 544 [Vac].




Remedy:

  • Adjust value on 0x2009. Use braking resistor.

  • Set parameters [0x2009] ~ [0x200E] to proper values.

  • Recheck the power supply.

  • If regenerative resistance temperature is high in Servo-off, replace drive.
AL-24
Motor cable open
Cause:


  • Parameter setting error (Phase current offset).

  • Motor cable disconnected.

  • Short circuit of U,V,W in Motor.




Remedy:

  • Process the Phase current offset control procedure command.

  • Replace motor cable.

  • Replace the motor.
AL-25
Drive temperature 2
Cause:

Ambient temperature over 50 [°C] or Drive error.



Remedy:

  • Lower the surrounding temperature.

  • Replace the drive.
AL-30
Encoder communication
Cause:


  • Encoder cable wiring incorrect or shorted.

  • Parameter setting error (Motor ID/Type).




Remedy:

  • Replace encoder cable.

  • Modify parameter to match motor label information.

  • If modified value is not applied, change servo motor.
AL-31
Encoder cable open
Cause:

Encoder error.



Remedy:

  • If alarm continues after servo on again, replace drive.
AL-32
Encoder data
Cause:

Drive error.



Remedy:

  • If alarm continues after servo on again, replace drive.
AL-33
Motor setting (ID Error)
Cause:

Setting Motor ID value [0x2000] is same with application motor label.



Remedy:

  • Revise it with motor label information equally.

  • Alarm may release after power off/on following parameter adjustment.

  • If alarm continues, replace drive.
AL-34
Z Phase open
Cause:


  • Parameter setting error (Warning mask).

  • Encoder cable wiring incorrect or short.

  • Encoder or Drive error.




Remedy:

  • For motors without Z phase (e.g., step motors), mask AL-34 in [0x2014].

  • Replace encoder cable.

  • If alarm continues, replace drive.
AL-35
Low battery
Cause:


  • Parameter setting error (Absolute encoder value).

  • Poor battery contact or not connected.

  • Battery voltage is low (under 3.3V).




Remedy:

  • If using absolute encoder as incremental, set [0x2005] to 1.

  • Connect battery tightly.

  • Replace battery.
AL-36
Sinusoidal ENC amplitude
Cause:


  • Encoder cable wiring incorrect/short/shield disconnect.

  • Parameter setting error (Encoder type).

  • Drive error.




Remedy:

  • Replace encoder cable.

  • Check setting encoder type. Check speed command (Max 250kHz).

  • If alarm continues, replace drive.
AL-37
Sinusoidal ENC frequency
Cause:

Converter error or Encoder error.



Remedy:

  • If alarm continues after servo on again, replace drive.
AL-38
Encoder setting error
Cause:


  • Drive / Motor combination error (Brand label mismatch).

  • Encoder cable wiring incorrect/short.

  • Encoder or Drive error.




Remedy:

  • Use motor and drive of same brand label.

  • Replace encoder cable.

  • If alarm continues, replace drive.
AL-39
Preset Error
Cause:


  • Parameter setting Error (Absolute encoder value).

  • Poor battery contact.

  • Initial encoder power supply timing.




Remedy:

  • If using absolute encoder as incremental, set [0x2005] to 1.

  • Connect battery correctly, reset alarm, reapply power. Check mechanical home.

  • Reapply power after alarm reset.
AL-40
Under voltage
Cause:


  • Main power input voltage error (Over 134 Vac).

  • DC Link voltage error (Value over 190 Vdc).

  • Running when power voltage is low.

  • Main power input below 286 Vac.




Remedy:

  • Recheck the power supply.

  • Replace the drive.

  • Use 3 phase as supply voltage.
AL-41
Over voltage
Cause:


  • DC link voltage error (Below 405 Vdc).

  • When braking resistor is high.

  • Setting value of acceleration/deceleration is too short.




Remedy:

  • Replace the drive.

  • Review the regenerative resistance considering operating condition/load.

  • Set longer acceleration / deceleration time.
AL-42
Main power fail
Cause:


  • Main power input voltage error (Phase L1, L2, L3).

  • Parameter setting error (Input mode [0x2006]).

  • Momentary power failure.




Remedy:

  • Recheck the power supply.

  • Wire or set parameter as input power on (possible 3 phase).

  • Check main power source or reduce value of [0x2007].

  • If alarm continues, replace drive.
AL-43
Control power fail
Cause:

Voltage between phase of C1, C2 is not within 200-230[Vac].



Remedy:

  • Recheck power supply of drive.

  • If alarm continues, replace drive.
AL-50
Over speed limit
Cause:


  • Motor/Encoder cable wiring incorrect or short.

  • Parameter setting Error (Motor ID/Electronic gear ratio).

  • Encoder or Drive error.




Remedy:

  • Replace motor/encoder cable.

  • Set Electronic gear ratio low.

  • Readjust gain according to operating condition.

  • If alarm continues, replace drive.
AL-51
POS following
Cause:


  • Parameter setting Error (Gear ratio/Pos error range).

  • Machine part has problem (forced by drive part).




Remedy:

  • Set Electronic gear ratio low.

  • Set up correct parameter according to operating method.

  • Check machine part has problem.

  • If alarm continues, replace drive.
AL-53
Cable Error
Cause:


  • Motor cable disconnected/wiring incorrect/short.

  • Encoder cable disconnected/wiring incorrect/short.




Remedy:

  • Replace motor cable.

  • Replace encoder cable.
Excessive SPD deviation
Cause:


  • Parameter setting Error (Motor ID).

  • Machine part has problem (forced by drive part).

  • Encoder/Drive error.




Remedy:

  • Modify parameter as same as motor label information.

  • Set Electronic gear ratio low.

  • Check machine part has problem.

  • If alarm continues, replace drive.
AL-63
Parameter checksum
Cause:

When O/S is changed (Parameter setting value set as max value of variable form).



Remedy:

  • Restore initial parameter (0x1011).

  • Set up parameter before operating.

  • If alarm continues, replace drive.
AL-71
Factory setting
Cause:

Parameter setting error.



Remedy:

  • Contact service center. Check [0x1008] Device Name.

  • Please download OS or set capacity of drive again.

  • If alarm continues, replace drive.
W01 (PWR_FAIL)
Main power input Voltage error
Cause:


  • Voltage between phase 200-230[Vac] error.

  • Parameter setting error [0x2006].

  • Momentary power failure.




Remedy:

  • Recheck the power supply.

  • Wire or set parameter as input power on.

  • Check actual main power or increase checking time of loss.

  • If alarm continues, replace drive.
W02 (LOW_BATT)
Low voltage of encoder battery
Cause:


  • Parameter setting error [0x2005].

  • Bad connection of battery.

  • Battery voltage is low (over 3.3V check).




Remedy:

  • Alarm disappears if set to “1” (Incremental mode).

  • Connect battery rightly.

  • Replace battery.
W04 (SW_POS_LMT)
Software Position Limit
Cause:

Parameter setting error (Software restriction on location [0x2400]).



Remedy:

  • Change value of software position limit function [0x2400].

  • Change limit value of max/min position [0x607D].
W10 (OV_LOAD)
Operation overload
Cause:


  • Sequent operating exceeding rated load.

  • Motor brake error (not holding).

  • Parameter setting error (Motor ID).

  • Machine part has problem.

  • Cable errors.




Remedy:

  • Change drive and motor capacity, please tune gain.

  • Adjust setting value overload warning level [0x2010].

  • Provide supply power to motor brake.

  • Modify parameter to match motor label.

  • Check machine part.

  • Replace cables.
W20 (SETUP)
Abnormal combination / IO setting
Cause:


  • Drive / Motor Combination error (Capacity mismatch).

  • IO setting error (Signal assignment duplicate).




Remedy:

  • Reduce value of torque limit or use motor with lower capacity than drive.

  • Set up correct parameter according to operating method.
W40 (UD_VTG)
Low Voltage
Cause:


  • Main power input voltage error (> 134 Vac).

  • DC link voltage error (190~405 Vdc).

  • Running when power voltage is low.




Remedy:

  • Recheck the power supply.

  • Replace the drive (if DC link error persists).

  • Use 3 phase as supply voltage.
W80 (EMG)
Emergency signal input
Cause:

EMG contact error / Drive error.



Remedy:

  • Set up correct parameter according to operating method.

  • If alarm continues after servo on again, replace drive.