Inovance MD500 Plus Drive Fault Codes List

A comprehensive guide to Inovance MD500-Plus fault codes. Troubleshoot this enhanced vector drive, interpret Err codes, and access diagnostic data via InoDriveShop.

Inovance MD500-Plus Fault Codes Reference Table

Below is the complete list of fault codes, definitions, and troubleshooting steps associated with the MD500-Plus series.

  Inovance MD500 Plus Drive Fault Codes List

Inovance MD500 Plus Drive Fault Codes List

Fault Code and Meaning Cause and Remedy
E02.00

Overcurrent during acceleration
Cause: Grounded or short-circuited output circuit of the AC drive.

Remedy:
  • Check whether the motor or relay contactor is short-circuited.
Cause: Auto-tuning is not performed in SVC or FVC control mode.

Remedy:
  • Set motor parameters according to the motor nameplate and perform motor auto-tuning.
Cause: Excessively short acceleration time.

Remedy:
  • Increase the acceleration time (F0-17).
Cause: Inappropriate overcurrent stall suppression.

Remedy:
  • Ensure that overcurrent stall suppression (F3-19) is enabled.
  • If the value of F3-18 (overcurrent stall suppression level) is too large, adjust it to a level between 120% and 160%.
  • If the value of F3-20 (overcurrent stall suppression gain) is too small, adjust it to a level between 20 and 40.
Cause: Inappropriate customized torque boost or V/f curve.

Remedy:
  • Adjust the customized torque boost or V/f curve.
Cause: Startup of a running motor.

Remedy:
  • Use flying start or restart the motor after the motor stops.
Cause: External interference to the AC drive.

Remedy:
  • View the fault records to check whether the fault current has ever reached the overcurrent suppression level (F3-18).
  • If not, check for external interference source.
  • If no external interference source is found, the driver board or Hall device might be damaged. Contact Inovance for replacement.
E03.00

Overcurrent during deceleration
Cause: Grounded or short-circuited output circuit of the AC drive.

Remedy:
  • Check whether the motor is short-circuited or open-circuited.
Cause: Auto-tuning is not performed in SVC or FVC control mode.

Remedy:
  • Set motor parameters according to the motor nameplate and perform motor auto-tuning.
Cause: Excessively short deceleration time.

Remedy:
  • Increase the deceleration time (F0-18).
Cause: Inappropriate overcurrent stall suppression.

Remedy:
  • Ensure that overcurrent stall suppression (F3-19) is enabled.
  • If the value of F3-18 is too large, adjust it to a level between 120% and 150%.
  • If the value of F3-20 is too small, adjust it to a level between 20 and 40.
Cause: The braking unit and braking resistor are not installed.

Remedy:
  • Install a braking unit and a braking resistor.
Cause: External interference to the AC drive.

Remedy:
  • View fault records to check if current reached suppression level (F3-18).
  • Check for external interference. If none, driver board/Hall device might be damaged. Contact Inovance.
E04.00

Overcurrent during operation at constant speed
Cause: Grounded or short-circuited output circuit of the AC drive.

Remedy:
  • Check whether the motor is short-circuited or open-circuited.
Cause: Auto-tuning is not performed in SVC or FVC control mode.

Remedy:
  • Set motor parameters according to the motor nameplate and perform motor auto-tuning.
Cause: Inappropriate overcurrent stall suppression.

Remedy:
  • Ensure overcurrent stall suppression (F3-19) is enabled.
  • Adjust F3-18 between 120% and 150%.
  • Adjust F3-20 between 20 and 40.
Cause: Inadequate power rating of the AC drive.

Remedy:
  • If running current exceeds rated motor current or rated output current during stable running, select an AC drive with a higher power rating.
Cause: External interference to the AC drive.

Remedy:
  • Check fault records and external interference sources. Contact Inovance if board is damaged.
E05.00

Overvoltage during acceleration
Cause: High input grid voltage.

Remedy:
  • Adjust the voltage to the normal range.
Cause: External force driving the motor during acceleration.

Remedy:
  • Cancel the external force or install a braking resistor.
  • If F3-26 (frequency rise threshold during overvoltage suppression) is too small, adjust it to between 5 Hz and 15 Hz.
Cause: Inappropriate overvoltage suppression.

Remedy:
  • Ensure overvoltage suppression (F3-23) is enabled.
  • If F3-22 is too large, adjust it to between 700 V and 770 V.
  • If F3-24 is too small, adjust it to between 30 and 50.
Cause: The braking unit and braking resistor are not installed.

Remedy:
  • Install a braking unit and a braking resistor.
Cause: Excessively short acceleration time.

Remedy:
  • Increase the acceleration time.
E06.00

Overvoltage during deceleration
Cause: Inappropriate overvoltage suppression.

Remedy:
  • Ensure overvoltage suppression (F3-23) is enabled.
  • If F3-22 is too large, adjust it to between 700 V and 770 V.
  • If F3-24 is too small, adjust it to between 30 and 50.
Cause: External force driving the motor during deceleration.

Remedy:
  • Cancel the external force or install a braking resistor.
  • If F3-26 is too small, adjust it to between 5 Hz and 15 Hz.
Cause: Excessively short deceleration time.

Remedy:
  • Increase the deceleration time.
Cause: The braking unit and braking resistor are not installed.

Remedy:
  • Install a braking unit and a braking resistor.
E07.00

Overvoltage during operation at constant speed
Cause: Inappropriate overvoltage suppression.

Remedy:
  • Ensure overvoltage suppression (F3-23) is enabled.
  • If F3-22 is too large, adjust it to between 700 V and 770 V.
  • If F3-24 is too small, adjust it to between 30 and 50.
Cause: External force driving the motor during operation.

Remedy:
  • Cancel the external force or install a braking resistor.
  • If F3-26 is too small, adjust it to between 5 Hz and 15 Hz.
E09.00

Undervoltage
Cause: Instantaneous power failure.

Remedy:
  • Enable the power dip ride-through function (F9-59).
Cause: AC drive input voltage out of range.

Remedy:
  • Adjust the voltage to a value within the normal range.
Cause: Abnormal bus voltage.

Remedy:
  • Contact Inovance for technical support.
Cause: Abnormal rectifier, IGBT driver board, or IGBT control board.

Remedy:
  • Contact Inovance for technical support.
E10.00

AC drive overload
Cause: Excessively heavy load or stalled motor.

Remedy:
  • Reduce the load and check the motor and mechanical conditions.
Cause: Inadequate power rating of the AC drive.

Remedy:
  • Use an AC drive with a higher power rating.
Cause: Auto-tuning is not performed in SVC or FVC control mode.

Remedy:
  • Set motor parameters according to the motor nameplate and perform motor auto-tuning.
Cause: Excessively high torque boost (F3-01) in V/f control mode.

Remedy:
  • Decrease the value of F3-01 by 1.0% each time or set F3-01 to 0 (automatic torque boost).
Cause: Output phase loss on the AC drive.

Remedy:
  • Check the output wiring of the AC drive.
E11.00

Motor overload
Cause: Inappropriate F9-01 (motor overload protection gain) setting.

Remedy:
  • Increase the value of F9-01 to prolong the motor overload time.
Cause: Excessively heavy load or stalled motor.

Remedy:
  • Reduce the load and check the motor and mechanical conditions.
E12.00

Input phase loss
Cause: Input phase loss.

Remedy:
  • Ensure proper input RST cables and three-phase input voltage.
E13.00

Output phase loss
Cause: Motor fault.

Remedy:
  • Check whether the motor is disconnected.
Cause: Abnormal lead wire connecting the AC drive to the motor.

Remedy:
  • Rectify external faults.
Cause: Unbalanced three-phase output of the AC drive during motor operation.

Remedy:
  • Ensure proper functioning of the motor three-phase winding.
Cause: Abnormal driver board or IGBT.

Remedy:
  • Contact the agent or Inovance for technical support.
E14.00

IGBT overtemperature		 Cause:
High ambient temperature; Blocked air filter; Damaged fan; Damaged thermistor of the IGBT; Damaged IGBT.

Remedy:

  • Lower the ambient temperature.
  • Clean the air filter.
  • Replace the damaged fan.
  • Contact the agent or Inovance for technical support.
E15.01

External fault		 Cause:
External fault signal input to the multi-function DI terminal (normally open).

Remedy:

Rectify the external fault, and ensure that the mechanical condition allows restart (F8-18).
E15.02

External fault		 Cause:
External fault signal input to the multi-function DI terminal (normally closed).

Remedy:

Rectify the external fault, and ensure that the mechanical condition allows restart (F8-18).
E16.01

Communication fault (Modbus)		 Cause:
Modbus communication timeout.

Remedy:

  • Ensure proper wiring of the RS485 communication cable.
  • Ensure proper settings of FD-04 and PLC communication cycle.
E16.11

Communication fault (CANopen)		 Cause:
CANopen communication timeout.

Remedy:

  • Ensure proper connection of the CAN communication cable.
  • Check the values of FD-15 to FD-17 and eliminate interference.
E16.12

Communication fault (CANopen PDO)		 Cause:
Inconsistency between the configured CANopen-based PDO mapping and the actual mapping.

Remedy:

Check the PDO mapping of parameters in group AF.
E16.21

Communication fault (CANlink)		 Cause:
CANlink heartbeat timeout.

Remedy:

  • Ensure proper connection of the CAN communication cable.
  • Check the values of FD-15 to FD-17 and eliminate interference.
E16.22

Communication fault (CANlink Conflict)		 Cause:
CANlink station number conflict.

Remedy:

Change the value of FD-13 to make CANlink station numbers different from each other.
E17.00

Contactor fault		 Cause:
Abnormal driver board and power supply; Abnormal contactor; Abnormal lightning protection board.

Remedy:

  • Replace the driver board or power supply board.
  • Replace the contactor.
  • Replace the lightning protection board.
E18.00

Damaged current sampling circuit		 Cause:
Abnormal AC drive current sampling.

Remedy:

  • Power on the main circuit.
  • If the Hall sensor or sampling current circuit is damaged, contact Inovance.
E19.02

Motor auto-tuning fault		 Cause:
Fault in auto-tuning on the magnetic pole position angle of the synchronous motor.

Remedy:

Ensure that the motor is connected and there is no output phase loss.
E19.06
E19.07
E19.08

Motor auto-tuning fault		 Cause:
Fault in auto-tuning on the stator resistance.

Remedy:

  • Ensure that the motor is connected.
  • Set F1-03 (rated motor current) according to the motor nameplate.
E19.09
E19.10

Motor auto-tuning fault		 Cause:
Fault in auto-tuning on the transient leakage inductance of the asynchronous motor.

Remedy:

  • Check whether the motor is connected or output phase is normal without loss.
  • Ensure that the motor is connected properly.
E19.11

Motor auto-tuning fault		 Cause:
Inertia auto-tuning fault.

Remedy:

  • Set F1-03 (rated motor current) according to the motor nameplate.
  • Increase the value of F2-43 (inertia auto-tuning and dynamic speed reference).
E19.20

Motor auto-tuning fault		 Cause:
Timeout of auto-tuning on the no-load zero position angle of the synchronous motor.

Remedy:

Check the Z feedback signal.
E19.23

Motor auto-tuning fault		 Cause:
Fault in auto-tuning on the magnetic pole position of the synchronous motor.

Remedy:

  • Set F1-03 (rated motor current) according to the motor nameplate.
  • Decrease the value of F2-29 (synchronous motor initial angle detection current).
E19.24

Motor auto-tuning fault		 Cause:
Errors in auto-tuning on the transient leakage inductance of the asynchronous motor.

Remedy:

Check whether the power rating of the AC drive is low. If yes, use an AC drive with a proper power rating matching the motor power.
E20.00

Encoder fault		 Cause:
Encoder disconnected.

Remedy:

Restore the connection.
E20.01
E20.02
E20.03...E20.08

Encoder fault / Disconnected / Tuning fault		 Cause:
General encoder faults, disconnections, or faults during no-load/with-load auto-tuning.

Remedy:

  • Ensure proper wiring of the PG cable.
  • Ensure proper wiring of the PG cable and power supply.
  • Ensure consistency between the encoder pulses per revolution and the value of F1-27.
  • Ensure proper wiring of the AB signal cable.
E20.09

Encoder fault		 Cause:
Encoder fault during auto-tuning of the synchronous motor.

Remedy:

Check the encoder Z signal and wiring of the PG card.
E20.10

Encoder fault		 Cause:
Synchronous motor encoder fault.

Remedy:

See general encoder remedies (Connection, F1-27 consistency).
E20.11

Encoder fault		 Cause:
The encoder is faulty during FVC no-load auto-tuning of the asynchronous motor.

Remedy:

  • Ensure that the encoder is properly connected.
  • Ensure consistency between the encoder pulses per revolution and the value of F1-27.
E20.12

Encoder fault		 Cause:
Excessive deviation between the encoder feedback speed and the speed estimated by SVC.

Remedy:

  • Check for encoder disconnection.
  • Ensure proper setting of motor parameters.
  • Ensure that motor auto-tuning is performed.
E20.13

Encoder fault		 Cause:
Resolver encoder disconnected.

Remedy:

Check the wiring of the encoder.
E20.17

Encoder fault		 Cause:
23-bit encoder disconnected.

Remedy:

Check the wiring of the 23-bit encoder.
E21.01
E21.02
E21.03
E21.04

EEPROM read/write fault		 Cause:
EEPROM read/write abnormality.

Remedy:

  • For communication write parameters, check the RAM addresses and the RAM address mapping of the parameters. (See 6.2.4 Parameter Address Rules).
  • If the EEPROM chip is damaged, contact Inovance to replace the control board.
E22.00
Motor auto-tuning error		 Cause:
Auto-tuned stator resistance out of range.

Remedy:
  • Correctly set F1-02 (rated motor voltage) and F1-03 (rated motor current) in group F1 according to the motor nameplate.
E22.01
Motor auto-tuning error		 Cause:
Auto-tuned rotor resistance of the asynchronous motor out of range.

Remedy:
  • Ensure that auto-tuning is performed after the motor stops.
E22.02
Motor auto-tuning error		 Cause:
The no-load current and mutual inductance of the asynchronous motor obtained through auto-tuning exceed the allowed range.
(Note: If this alarm is reported, the AC drive calculates values based on known parameters which may not be optimal).

Remedy:
  • Set motor parameters in group F1 according to the motor nameplate.
  • Ensure that the motor has no load before auto-tuning.
E22.03
Motor auto-tuning error		 Cause:
Auto-tuned back EMF of the synchronous motor out of range.

Remedy:
  • Set F1-02 (rated motor voltage) according to the motor nameplate.
  • Ensure that the motor has no load before auto-tuning.
E22.04
Motor auto-tuning error		 Cause:
Inertia auto-tuning fault.

Remedy:
  • Set F1-03 (rated motor current) according to the motor nameplate.
E23.00
Short circuit to ground		 Cause:
Motor shorted to the ground.

Remedy:
  • Check and replace the motor cables and motor if necessary.
E24.00
Motor inter-phase short circuit		 Cause:
Motor inter-phase short circuit.

Remedy:
  • Check whether a two-phase short circuit occurs on the output UVW.
E25.00
Rectifier fault		 Cause:
Rectifier fault (e.g., input phase loss, overtemperature).

Remedy:
Rectify corresponding faults based on feedback signals:
  • 1: Operation enabled
  • 2: Incoming circuit breaker feedback
  • 3: Auxiliary circuit breaker feedback
  • 4: Leakage protection switch feedback (Alarm reported if no signal)
  • 6: Inverter unit operation inhibited
  • 7: Inverter unit coast-to-stop
  • 8: User-defined inverter unit stop (Alarm reported if terminal active)
E26.00
Accumulative running time reach		 Cause:
The accumulative running time has reached the reference value.

Remedy:
  • Clear the record through parameter initialization.
E27.00
User-defined fault 1		 Cause:
The user-defined fault 1 signal is input via the DI OR input through the virtual I/O function.

Remedy:
  • Perform a reset.
E28.00
User-defined fault 2		 Cause:
The user-defined fault 2 signal is input via the DI OR input through the virtual I/O function.

Remedy:
  • Perform a reset.
E29.00
Accumulative power-on time reach		 Cause:
The accumulative power-on time has reached the reference value.

Remedy:
  • Clear the record through parameter initialization.
E30.00
Load lost		 Cause:
Running current of the AC drive less than the value of F9-64.

Remedy:
  • Check for load disconnection and mismatching between the values of F9-64 and F9-65 and actual working conditions.
E31.00
PID feedback loss during operation		 Cause:
PID feedback less than the value of FA-26.

Remedy:
  • Check the PID feedback signals or set FA-26 to a proper value.
E40.00
Pulse-by-pulse current limit fault		 Cause:
1. Excessively heavy load or stalled motor.
2. Inadequate power rating of the AC drive.

Remedy:
  • Reduce the load and check the motor and mechanical conditions.
  • Use an AC drive with a higher power rating.
E42.00
Excessive speed deviation		 Cause:
1. Incorrect setting of encoder parameters.
2. Auto-tuning is not performed on parameters.
3. Inappropriate setting of F9-69 and F9-70.

Remedy:
  • Set encoder parameters properly.
  • Perform motor parameter auto-tuning.
  • Set the parameters correctly based on actual conditions.
E43.00
Motor overspeed		 Cause:
1. Incorrect setting of encoder parameters.
2. Auto-tuning is not performed on parameters.
3. Inappropriate setting of F9-67 and F9-68.

Remedy:
  • Set encoder parameters properly.
  • Perform motor parameter auto-tuning.
  • Set the parameters correctly based on actual conditions.
E45.00
Motor overtemperature		 Cause:
1. Temperature sensor loosely connected.
2. High motor temperature.
3. Excessively low value of F9-57 (motor overtemperature protection threshold).

Remedy:
  • Check the wiring of the temperature sensor.
  • Increase the carrier frequency or take other heat dissipation measures to cool the motor.
  • Adjust the threshold to a level between 90°C and 100°C.
E60.00
AC drive overtemperature		 Cause:
High internal temperature of the AC drive.

Remedy:
  • Replace the fan in the AC drive.
  • Contact Inovance.
E61.00
Braking transistor overload		 Cause:
Excessively low resistance of the braking resistor.

Remedy:
  • Use a braking resistor with higher resistance.
E62.00
Braking transistor short circuit		 Cause:
Braking transistor short circuit.

Remedy:
  • Ensure proper functioning of the braking transistor.
  • Check whether an external braking resistor is installed.
E63.00
Low liquid level alarm		 Cause:
Low liquid level of the water tank.

Remedy:
  • Add coolant.
E64.00
Water cooling system fault		 Cause:
Water-cooling system control unit fault.

Remedy:
  • Perform a reset.
  • Replace the control unit.

How to Read MD500-Plus Faults via InoDriveShop

The MD500-Plus is often installed in critical or difficult environments (textiles, stone processing, etc.). Accurate diagnosis is vital to prevent repeat failures. In 2026, using the InoDriveShop PC software is the standard for troubleshooting.

  • Environmental Context: Since the “Plus” series is designed for harsher environments, pay close attention to thermal faults (like Err14). Use the software to check the “Module Temperature” history to see if the drive is suffering from blocked airflow or ambient heat spikes.
  • Detailed Fault Snapshot: The drive stores detailed electrical data (Bus Voltage, Current, I/O State) at the exact moment of the trip. This is accessible via parameter group U0 or the “Fault Diagnosis” window in InoDriveShop.
  • Waveform Recording: For intermittent issues, use the oscilloscope function to trigger a recording on a specific fault code. This helps verify if power supply instability or instantaneous load shocks are triggering the protection mechanisms.

Frequently Asked Questions (FAQ)

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

A: An Alarm (displayed as ‘A’ or ‘ALm’ codes) is a warning that operational limits are being reached, but the drive continues to output power. A Fault (displayed as ‘Err’ codes) is a hard stop condition where the drive immediately disables the output to protect internal components.

Q: How do I reset an Inovance MD500-Plus fault?

A: You can reset the drive using the following methods:

  1. Pressing the STOP/RESET button on the keypad.
  2. Activating a Digital Input (DI) programmed for the “Reset” function (Function 9).
  3. Cycling the main power (ensure the display turns off completely before powering back on).

Q: Where is the fault history stored?

A: The MD500-Plus stores the last 3 fault codes in parameters U0-00 (most recent), U0-01, and U0-02. The specific running data (Amps, Volts, Hz) for the most recent fault is preserved in parameters U0-03 through U0-17.

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