LS Electric iX7NH Drive

LS Electric iX7NH Drive Fault Codes:

Fault Code and MeaningCause and Remedy
AL-10

IPM fault
(Overcurrent H/W)
Cause:

  • Motor cable abnormality.

  • Encoder cable abnormality.

  • Parameter setting abnormality.




Remedy:

  • Check for abnormal wiring or short circuit. Replace the motor cable.

  • Check for abnormal wiring or short circuit. Replace the encoder cable.

  • Make sure settings for Motor ID [0x2000], Encoder Type [0x2001], and Format [0x2002] match the motor label. Modify parameters if necessary.
AL-11

IPM temperature
(IPM Overheat)
Cause:

  • Ambient temperature is too high.

  • Continual overload alarm.

  • Highly frequent or continual regenerative operation.

  • Drive installation direction issue.

  • Drive abnormality.




Remedy:

  • Check if ambient temperature exceeds 50°C. Lower temperature around the drive.

  • Check accumulated operation overload ratio [0x2603]. Change capacity of drive/motor or adjust gain.

  • Check accumulated regeneration overload ratio [0x2606]. Adjust regeneration brake resistor [0x2009] or use an external resistor.

  • Refer to “Wiring and Connection” section for installation status.

  • If alarm persists after power cycling, replace the drive.
AL-14

Over current
(Overcurrent S/W)
Cause:

  • Motor phase resistance issue.

  • Apparatus abnormality.




Remedy:

  • Inspect resistance between motor lines (U-V, V-W, W-U should be below several Ω). Replace motor if needed.

  • Inspect apparatus for conflicts or binding.
AL-15

Current offset
(Current offset abnormality)
Cause:

  • Motor U, V phase current offset set excessively.

  • Drive abnormality.




Remedy:

  • Check U/V/W-phase current offsets [0x2015]~[0x2017]. If 5% or higher of rated current, adjust again.

  • If alarms occur continually after adjustment, replace the drive.
AL-16

Current limit exceeded
(Overcurrent H/W)
Cause:

  • Drive abnormality.

  • Noise-related abnormalities.




Remedy:

  • If alarm occurs continually after power cycling, replace the drive.

  • Resolve noise by checking wiring/installation. Check PE wiring. Adjust PE wiring size to match drive main circuit wiring.
AL-21

Continuous overload
Cause:

  • Continuous operation with load exceeding rated value.

  • Motor brake abnormality.

  • Parameter setting abnormality.

  • Apparatus or Cable abnormality.




Remedy:

  • Check load rate [0x2603]. Change motor/drive capacity or adjust gain.

  • Check opening of motor brake during SVON. Supply power to brake.

  • Verify Motor ID, Encoder Type/Format settings match label. Check overload check base [0x200F].

  • Inspect apparatus for binding. Check motor/encoder cables for shorts/wiring issues.
AL-22

Drive temperature 1
(Drive overheat 1)
Cause:

  • Ambient temperature too high.

  • Drive abnormality.




Remedy:

  • Check if ambient temp > 50°C. Lower temperature.

  • Check if displayed temp [0x260B] differs greatly from ambient. Replace drive if sensor is faulty.
AL-23

Regenerative overload
Cause:

  • Capacity exceeded due to frequent operation or continual regeneration.

  • Parameter setting abnormality.

  • Main power input voltage too high (544 Vac or higher).

  • Drive abnormality (Resistor generating heat when not in operation).




Remedy:

  • Check accumulated regeneration rate [0x2606]. Adjust resistor config [0x2009] or use external resistor.

  • Re-inspect main power source voltage.

  • Replace the drive if resistor heats up unexpectedly.
AL-24

Motor cable open
(Motor disconnection)
Cause:

  • Parameter setting abnormality (Current offsets).

  • Motor cable abnormality (Disconnection).

  • Motor abnormality (Internal short).

  • Drive abnormality.




Remedy:

  • Check settings at [0x2015]-[0x2017]. Execute command for current offset adjustment.

  • Check for cable disconnection. Replace motor cable.

  • Check for U, V, W short inside motor. Replace motor.

  • If alarm occurs continuously after SV-ON, replace the drive.
AL-25

Drive temperature 2
(Drive overheat 2)
Cause:

  • Ambient temperature.

  • Drive abnormality.




Remedy:

  • Lower temperature around the drive if > 50°C.

  • Check displayed temp 2 value [0x260C]. Replace drive if faulty.
AL-26

Encoder temperature
(Encoder Overheat)
Cause: Reserved.


Remedy: –
AL-28

Fan trip
(DC cooling fan abnormality)
Cause: DC cooling fan abnormality (Disconnection, short, abnormal connection).


Remedy: Connect DC cooling fan. If alarm persists after power cycle, replace the DC cooling fan.
AL-29

Regeneration brake fault
Cause: Regeneration resistor abnormality (Disconnection or short).


Remedy: Connect regeneration brake resistor. If alarm persists, replace the regenerative resistor.
AL-30

Encoder communication
(Serial Encoder Error)
Cause:

  • Encoder cable abnormality.

  • Parameter setting abnormality.

  • Encoder abnormality.

  • Drive abnormality.




Remedy:

  • Check for disconnection/short. Replace encoder cable.

  • Match Encoder Type [0x2001] and Resolution [0x2002] to label.

  • If alarm persists, replace motor or drive.
AL-31

Encoder cable open
(Disconnection)
Cause: Encoder abnormality.


Remedy: If alarm occurs continually, replace the motor (internal encoder issue).
AL-32

Encoder data
(Encoder Data Error)
Cause: Drive abnormality.


Remedy: If alarm occurs continually after power cycling, replace the drive.
AL-33

Motor setting
(Motor ID Setting Error)
Cause:

  • Motor ID setting mismatch.

  • Drive abnormality.




Remedy:

  • Ensure Motor ID [0x2000] matches motor label. Alarm clears after param modification and power cycle.

  • If alarm persists, replace the drive.
AL-34

Z Phase open
(Encoder Z-phase Loss)
Cause:

  • Parameter setting abnormality.

  • Encoder cable abnormality.

  • Encoder or Drive abnormality.




Remedy:

  • If using step motor (no Z phase), set 14th bit in warning mask [0x2014] to mask AL-34.

  • Check wiring/shorts. Replace encoder cable.

  • Replace motor or drive if hardware is faulty.
AL-35

Low battery
(Encoder battery low)
Cause:

  • Parameter setting abnormality.

  • Defective battery connection.

  • Low battery voltage (< 3.3V).




Remedy:

  • For incremental usage of absolute encoder, set Absolute Encoder Config [0x2005] to 1.

  • Connect battery accurately.

  • Replace the battery.
AL-36

Sinusoidal ENC amplitude
Cause:

  • Encoder cable abnormality (Shield/PE).

  • Drive abnormality.




Remedy:

  • Check for disconnection, shield, and PE connection. Replace cable.

  • Replace drive if alarm persists.
AL-37

Sinusoidal ENC frequency
Cause:

  • Parameter setting abnormality.

  • Converter failure.

  • Encoder abnormality.




Remedy:

  • Check Encoder Type [0x2001] and Speed Command (Max 250kHz).

  • Replace converter or encoder if hardware is faulty.
AL-38

Encoder setting error
Cause:

  • Abnormal combination of drive and motor.

  • Encoder cable abnormality.

  • Encoder/Drive abnormality.




Remedy:

  • Use a drive and motor with the same brand label.

  • Check wiring. Replace encoder cable.

  • Replace motor or drive if alarm persists.
AL-3b

Encoder position error
(Position loss)
Cause:

  • Defective battery connection.

  • Low battery voltage.




Remedy:

  • Check connection, then execute GB preset procedure.

  • Replace battery (> 3.3V), then execute GB preset procedure.
AL-40

Under voltage
(Low Voltage)
Cause:

  • Main power input voltage abnormality (< 134 Vac).

  • DC link voltage low (< 190 Vdc).

  • Lowered power voltage during operation.




Remedy:

  • Re-inspect main power source.

  • Check DC link voltage [0x2605]. Replace drive if internal reading is wrong.

  • Use 3-phase voltage supply.
AL-41

Over voltage
Cause:

  • Main power input voltage too high (> 286 Vac).

  • DC link voltage high (> 405 Vdc).

  • Too large external regeneration resistor.

  • Rapid acceleration/deceleration.




Remedy:

  • Re-inspect main power source.

  • Recheck regeneration resistor value.

  • Set a higher value for acceleration/deceleration time.
AL-42

Main power fail
Cause:

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

  • Parameter setting abnormality (Check mode).

  • Momentary power outage.




Remedy:

  • Re-check power (200-240 Vac).

  • Use 3-phase input if possible and adjust [0x2006].

  • Increase monitoring interval [0x2007] or check power supply.
AL-43

Control power fail
Cause: Voltage failure between C1 and C2 phases.


Remedy: Re-inspect control power (should be 200-240 Vac). Replace drive if alarm persists.
AL-50

Over speed limit
Cause:

  • Motor/Encoder cable abnormality.

  • Parameter setting abnormality.

  • Gear ratio or Gain settings.




Remedy:

  • Replace motor/encoder cable.

  • Match Motor ID/Encoder settings to label.

  • Lower electric gear ratio [0x6091]. Re-adjust gain [0x2100]~[0x211F].
AL-51

POS following
(Excessive Position Error)
Cause:

  • Parameter setting abnormality (Gear ratio, Error window).

  • Apparatus binding.

  • Drive abnormality.




Remedy:

  • Lower electric gear ratio [0x6091]. Adjust error window [0x6065] and timeout [0x6066].

  • Inspect apparatus for binding.

  • Replace drive if alarm persists.
AL-53

Excessive SPD deviation
Cause:

  • Motor/Encoder cable abnormality.

  • Parameter setting abnormality.

  • Apparatus binding or Limit contact sensor.




Remedy:

  • Replace motor/encoder cables.

  • Match Motor ID/Encoder settings to label. Lower gear ratio.

  • Inspect apparatus.
AL-56

Excessive position command
Cause:

  • Motor/Encoder cable abnormality.

  • Parameter setting abnormality.




Remedy:

  • Replace motor/encoder cables.

  • Match Motor ID/Encoder settings to label. Lower gear ratio.
AL-57

Excessive pulse output speed
Cause: Parameter setting abnormality.


Remedy:

  • Lower encoder output pulse [0x2422] setting.

  • Lower electric gear ratio [0x6091].
AL-63

Parameter checksum
Cause: O/S replacement (Variable parameters set to maximum).


Remedy: Restore default parameters (0x1011). Initialize and re-set parameters before operation.
AL-71

Factory setting
Cause: Parameter setting abnormality.


Remedy: Contact service center. Check drive capacity at [0x1008]. Reset drive capacity and download OS again.
W01

PWR_FAIL
(Main Power Phase Loss)
Cause:

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

  • Parameter setting abnormality.

  • Momentary power outage.




Remedy:

  • Re-inspect main power source (200-240 Vac).

  • Adjust main power fail check mode [0x2006].

  • Increase main power fail check time [0x2007].
W02

LOW_BATT
(Low Voltage of Encoder Battery)
Cause:

  • Parameter setting abnormality.

  • Defective battery connection.

  • Low battery voltage.




Remedy:

  • For incremental encoder usage, set [0x2005] to 1.

  • Connect battery accurately.

  • Replace battery if < 3.3V.
W03

SW_POS_LMT
(Software Position Limit)
Cause: Parameter setting abnormality.


Remedy: Change settings of software position limit function select [0x2400] or limit values [0x607D].
W10

OV_LOAD
(Operation Overload)
Cause:

  • Continuous operation with load exceeding rated value.

  • Motor brake abnormality.

  • Parameter setting abnormality.

  • Apparatus or Cable abnormality.




Remedy:

  • Check overload rate [0x2603]. Change motor/drive capacity or adjust gain.

  • Check motor brake.

  • Match Motor ID/Encoder settings.

  • Inspect apparatus and cables.
W20

SETUP
(Setting abnormality)
Cause:

  • Abnormal combination of drive and motor.

  • IO setting abnormality (Signal overlap).




Remedy:

  • Lower torque limit or replace motor/drive to match capacities.

  • Set IO parameters [0x2200]-[0x2212] correctly.
W40

UD_VTG
(Low Voltage)
Cause:

  • Main power input voltage abnormality (< 134 Vac).

  • DC link voltage low (< 190 Vdc).

  • Lowered power voltage during operation.




Remedy:

  • Re-inspect main power.

  • Replace drive if DC link voltage reading is incorrect.

  • Use 3-phase voltage supply.
W80

EMG
(Emergency Signal Input)
Cause: EMG contact abnormality.


Remedy: This represents emergency pause state. Check wiring and parameters [0x211F], [0x2200], [0x2205]. Set wiring and parameters for operation conditions.