LS iX7NH Fault Codes List

Troubleshoot your LS iX7NH EtherCAT servo drive with our updated guide. Learn to interpret AL-xx alarm codes, use DriveView 9 for diagnostics, and resolve common motion errors.

iX7NH Fault Codes Reference Table

Below is the complete list of alarms and warnings for the iX7NH series. Please refer to this table to match the code on your drive’s display with the specific hardware or communication diagnostic.

LS iX7NH Fault Codes List

LS iX7NH Fault Codes List

Fault Code and Meaning Cause 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.
 

How to Read iX7NH Faults via DriveView 9

While the LED display provides the primary alarm code, connecting your PC to the drive via the USB port using DriveView 9 software provides a much higher level of diagnostic detail required for 2026 industrial standards.

  • Alarm History: The iX7NH stores a history of past alarms. DriveView 9 allows you to view these with precise timestamps, helping you identify if a fault (like AL-21) is recurring at specific times of the day.
  • Status Monitoring: You can monitor real-time EtherCAT communication states, encoder pulse counts, and bus voltages. This is critical for identifying if electrical noise is corrupting the motion data.
  • Object Dictionary: For advanced EtherCAT troubleshooting, you can browse the CoE (CANopen over EtherCAT) objects to see the internal drive state that the LED display doesn’t show.

General Troubleshooting Steps for iX7NH Servos

Before performing a reset, verify these three critical areas of the servo system:

  1. EtherCAT Connectivity: For communication alarms (AL-8x), check the IN/OUT RJ45 cables for damage. Ensure the EtherCAT master (PLC/CNC) is sending valid synchronization pulses.
  2. Encoder Feedback: For AL-2x alarms, verify the encoder cable shielding. Precision servos like the iX7NH are sensitive to EMI; ensure the motor cable and encoder cable are properly separated.
  3. Safe Torque Off (STO): If the drive shows “St” or “Safe” on the display, it is not a fault; the STO safety circuit is open. Check your safety relay and the CN1/CN6 connector wiring.

Frequently Asked Questions (FAQ)

Q: What is the difference between an Alarm and a Warning?

A: An Alarm (e.g., AL-10) is a critical fault that immediately cuts power to the motor (Servo-OFF). A Warning (indicated by a flashing code or specific status bit) notifies you of a non-critical issue, like an absolute encoder battery becoming low, allowing the motor to continue running temporarily.

Q: How do I reset a fault on the LS iX7NH?

A: Once the cause of the alarm has been fixed, you can reset the drive by:

  • Using the Alarm Reset function in DriveView 9.
  • Sending a Reset command via the EtherCAT Controlword.
  • Cycling the control power supply (L1C, L2C). Note: Major faults like IPM Overcurrent (AL-10) require a power cycle.

Q: Why does my drive show “AL-24” (Absolute Position Lost)?

A: This typically happens when the battery for the absolute encoder has died while the main power was off. You must replace the battery and perform the Absolute Encoder Reset (Origin Setting) procedure via the parameters.

Q: Where is the fault history stored?

A: Fault history can be accessed through the drive parameters (usually Group 04 in the monitor group) or by using the Troubleshooting tab in the DriveView 9 software suite.

Comments

Post a Comment

Popular posts from this blog

Allen Bradley Kinetix 5500 Drive Fault Codes List

Complete guide to Allen Bradley Kinetix 5500 fault codes. Troubleshoot FLT codes, Single-Cable (DSL) feedback errors, shared bus faults, and perform diagnostics via Studio 5000. Kinetix 5500 Fault Codes Reference Table Kinetix 5500 Fault Codes Reference Table Kinetix 5500 Fault Codes Reference Table Fault Code and Meaning Cause and Remedy FLT S03 – MTR OVERSPEED FL Motor Overspeed Factory Limit Fault Cause: Motor speed has exceeded 125% of its maximum speed. Remedy: Check control loop tuning. FLT S04 – MTR OVERSPEED UL Motor Overspeed User Limit Fault Cause: Motor speed has exceeded motor overspeed user limit. Remedy: Check control loop tuning. Increase the Motor Overspeed UL attribute value. FLT S05 – MTR OVERTEMP FL Motor Overtemperature Factory Limit Fault Cause: Calculations based ...
Read more

Danfoss VACON 100 FLOW Drive Fault Codes List

Access the complete reference guide for Danfoss VACON 100 FLOW drive fault codes. Learn to diagnose Multipump communication errors, dry run faults, and use Vacon Live software. VACON 100 FLOW Fault Codes Reference Table VACON 100 FLOW Faults and Alarms VACON 100 FLOW - Fault Tracing Fault Code and Meaning Cause and Remedy Fault Code 1, ID 1 Overcurrent (Hardware Fault) Cause: There is too high a current (> 4 × IH) in the motor cable. a sudden heavy load increase a short circuit in the motor cables the motor is not the correct type the parameter settings are not properly made Remedy: Check the loading. Check the motor. Check the cables and connections. Make an identification run. Set the acceleration time longer (P3.4.1.2 and P3.4.2.2). Fault Code 1, ID 2 Overcurrent (Software Fault...
Read more

ABB ACH580 Drive Fault Codes List

Access the complete reference guide for ABB ACH580 HVAC drive fault codes. Learn to diagnose issues via the Hand-Off-Auto panel, BACnet integration, and Fireman’s Override. The ABB ACH580 is the industry-standard flagship drive for HVACR applications. Designed to control air handling units, cooling towers, and chillers, it ensures critical comfort and safety in buildings. When a malfunction occurs, the dedicated Hand-Off-Auto (HOA) control panel displays a 4-digit code alongside plain-text diagnostics, often integrated directly into the Building Management System (BMS). This guide provides the most updated reference to help you interpret these codes and maintain building environmental standards. ACH580 Fault Codes Reference Table Use the search bar below or browse the table to identify your specific error code: ABB ACH580 Drive Fault Codes List ABB ACH580 Drive Fault Codes List Fault Code and Meaning Cause and Remedy A2B1...
Read more