Inovance MD800 Drive Fault Codes List

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A comprehensive guide to Inovance MD800 multidrive fault codes. Learn to interpret Err codes, use InoDriveShop for diagnostics, and resolve multidrive issues.

Inovance MD800 Fault Codes Reference Table

Below is the complete list of error codes and alarm definitions associated with the MD800 multidrive system.

Fault Codes Cause & Solution
E01.06
STO model
identification
error		 Cause: The hardware is faulty.

Solution:

- Check the AC drive nameplate to confirm whether the AC drive has the STO function.
- After this same fault comes then there is an hardware or software issue in drive. Need to repair or replace drive.
E01.07
AC drive
axis type
identification
setting error		 Cause: The hardware is faulty.

Solution:

- Check the AC drive nameplate to confirm the axis type (single-axis or dual-axis) of the AC drive.
E02.04
Overcurrent
during
acceleration		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The set acceleration time is too short.
4 The overcurrent stall suppression setting is improper.
5 The manual torque boost or V/f curve is improper.
6 The motor is started while rotating.
7 The AC drive suffers external interference.

Solution:

1 Check the motor and the relay contactor and make sure that they are not short- circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Increase the acceleration time (F0-17).
4 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value between 120% and 160%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
5 Adjust the manual torque boost or V/f curve.
6 Select the flying start mode or start the AC drive after the motor stops.
7 Check whether the fault current reaches the overcurrent stall suppression current (F3-18) by viewing the fault log. If not, the fault is possibly caused by external interference. In this case, find out the external interference source and rectify the fault.If no external interference source is found, the drive board or Hall device may be damaged.
E02.05
Overcurrent
during
acceleration		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The set acceleration time is too short.
4 The overcurrent stall suppression setting is improper.
5 The manual torque boost or V/f curve is improper.
6 The motor is started while rotating.
7 The AC drive suffers external interference.

Solution:

1 Check the motor and the relay contactor and make sure that they are not short- circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Increase the acceleration time (F0-17).
4 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value between 120% and 160%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
5 Adjust the manual torque boost or V/f curve.
6 Select the flying start mode or start the AC drive after the motor stops.
7 Check whether the fault current reaches the overcurrent stall suppression current (F3-18) by viewing the fault log. If not, the fault is possibly caused by external interference. In this case, find out the external interference source and rectify the fault.If no external interference source is found, the drive board or Hall device may be damaged.
E02.06
Overcurrent
during
acceleration		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The set acceleration time is too short.
4 The overcurrent stall suppression setting is improper.
5 The manual torque boost or V/f curve is improper.
6 The motor is started while rotating.
7 The AC drive suffers external interference.

Solution:

1 Check the motor and the relay contactor and make sure that they are not short- circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Increase the acceleration time (F0-17).
4 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value between 120% and 160%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
5 Adjust the manual torque boost or V/f curve.
6 Select the flying start mode or start the AC drive after the motor stops.
7 Check whether the fault current reaches the overcurrent stall suppression current (F3-18) by viewing the fault log. If not, the fault is possibly caused by external interference. In this case, find out the external interference source and rectify the fault.If no external interference source is found, the drive board or Hall device may be damaged.
E03.04
Overcurrent
during
deceleration		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The set deceleration time is too short.
4 The overcurrent stall suppression setting is improper.

Solution:

1 Check the motor and make sure that the motor is not short-circuited or open-circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Increase the deceleration time (F0-18).
4 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value
between 120% and 150%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
E03.05
Overcurrent
during
deceleration		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The set deceleration time is too short.
4 The overcurrent stall suppression setting is improper.

Solution:

1 Check the motor and make sure that the motor is not short-circuited or open-circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Increase the deceleration time (F0-18).
4 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value
between 120% and 150%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
E03.06
Overcurrent
during
deceleration		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The set deceleration time is too short.
4 The overcurrent stall suppression setting is improper.

Solution:

1 Check the motor and make sure that the motor is not short-circuited or open-circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Increase the deceleration time (F0-18).
4 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value
between 120% and 150%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
E04.04
Overcurrent
at constant
speed		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The overcurrent stall suppression setting is improper.
4 The AC drive power rating is too low.
5 The AC drive suffers external interference.

Solution:

1 Check the motor and make sure that the motor is not short-circuited or open-circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value
between 120% and 150%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
4 During stable running, if the running current exceeds the rated motor current or rated output current of the AC drive, replace the AC drive with one of higher power rating.
5 Check whether the fault current reaches the overcurrent stall suppression current (F3-18) by viewing the fault log. If not, the fault is possibly caused by external interference. In this case, find out the external interference source and rectify the fault.If no external interference source is found, the drive board or Hall device may be damaged.
E04.05
Overcurrent
at constant
speed		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The overcurrent stall suppression setting is improper.
4 The AC drive power rating is too low.
5 The AC drive suffers external interference.

Solution:

1 Check the motor and make sure that the motor is not short-circuited or open-circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value
between 120% and 150%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
4 During stable running, if the running current exceeds the rated motor current or rated output current of the AC drive, replace the AC drive with one of higher power rating.
5 Check whether the fault current reaches the overcurrent stall suppression current (F3-18) by viewing the fault log. If not, the fault is possibly caused by external interference. In this case, find out the external interference source and rectify the fault.If no external interference source is found, the drive board or Hall device may be damaged.
E04.06
Overcurrent
at constant
speed		 Cause:

1 A grounding fault or short circuit exists in the output circuit of the AC drive.
2 The SVC control mode is adopted, and motor auto-tuning is not performed.
3 The overcurrent stall suppression setting is improper.
4 The AC drive power rating is too low.
5 The AC drive suffers external interference.

Solution:

1 Check the motor and make sure that the motor is not short-circuited or open-circuited.
2 Set the motor parameters according to the motor nameplate and perform motor auto- tuning.
3 Ensure that overcurrent stall suppression (F3-19) is enabled.The overcurrent stall action current (F3-18) is too large. Adjust it to a value
between 120% and 150%.The overcurrent stall suppression gain (F3-20) is too small. Adjust it to a value between 20 and 40.
4 During stable running, if the running current exceeds the rated motor current or rated output current of the AC drive, replace the AC drive with one of higher power rating.
5 Check whether the fault current reaches the overcurrent stall suppression current (F3-18) by viewing the fault log. If not, the fault is possibly caused by external interference. In this case, find out the external interference source and rectify the fault.If no external interference source is found, the drive board or Hall device may be damaged.
E05.00
Overvoltage
during
acceleration		 Cause:

- The input grid voltage is too large.
- An external force drives the motor during acceleration.
- The overvoltage stall suppression parameters are set improperly.
- The power supply unit is not provided with a braking unit and no braking resistor is installed
- The acceleration time is too short.

Solution:

- Adjust the input grid voltage to the normal range.
- Cancel the external force or install a braking resistor.
The maximum rise frequency during overvoltage stall suppression (F3-26) is too low. Adjust it to a value between 5 Hz and 15 Hz when an external force is applied.
- Ensure that the overvoltage stall suppression function (F3-23) is enabled.
The overvoltage stall suppression voltage (F3-22) is too large. Adjust it to a value between 700 V and 770 V.
- Replace the power supply unit with one that has a braking unit and install a braking resistor.
- Increase the acceleration time (F0-17).
E06.00
Overvoltage
during
deceleration		 Cause & Solution:

1. The overvoltage stall suppression parameters are set improperly.

- Ensure that the overvoltage stall suppression function (F3-23) is enabled.
- The overvoltage stall suppression voltage (F3-22) is too large. Adjust it to a value between 700 V and 770 V.
- The overvoltage stall suppression frequency gain (F3- 24) is too small. Adjust it to a value between 30 and 50.

2. An external force drives the motor during deceleration.

- Cancel the external force or install a braking resistor.
- The maximum rise frequency during overvoltage stall suppression (F3-26) is too low. Adjust it to a value between 5 Hz and 15 Hz when an external force is applied.

3. The deceleration time is too short.

- Increase the deceleration time (F0-18).

4. The power supply unit is not provided with a braking unit and no braking resistor is installed.

- Replace the power supply unit with one that has a braking unit and install a braking resistor.
E07.00
Overvoltage
at constant
speed		 Cause & Solution:

1. The overvoltage stall suppression parameters are set improperly.
- Ensure that the overvoltage stall suppression function (F3-23) is enabled.
- The overvoltage stall suppression voltage (F3-22) is too large. Adjust it to a value between 700 V and 770 V.
- The overvoltage stall suppression frequency gain (F3- 24) is too small. Adjust it to a value between 30 and 50.

2. An external force drives the motor during running.
- Cancel the external force or install a braking resistor.
- The maximum rise frequency during overvoltage stall suppression (F3-26) is too low. Adjust it to a value between 5 Hz and 15 Hz when an external force is applied.
E07.01
Overvoltage
at constant
speed		 Cause: The bus voltage of the single- phase AC drive is too large.

Solution:

- Check whether the bus voltage of the single-phase AC drive exceeds 410.0 V.
E09.00
Undervoltage  		 Cause & Solution:

1. An instantaneous power failure occurs.
- Enable the power dip ride-through function (F9-63).

2. The input voltage of the AC drive is beyond the specified range.
- Adjust the input voltage of the AC drive to the normal range.

3. The bus voltage is abnormal.
- There is an hardware or software issue in drive. Need to repair or replace drive.

4. The power supply unit, the drive board of the drive unit, or the control board of the drive unit is abnormal.
- There is an hardware or software issue in drive. Need to repair or replace drive.
E10.00
AC drive
overload 		 Cause & Solution:

1. The load is too heavy or locked-rotor occurs.
- Reduce the load and check the motor and mechanical conditions.

2. The AC drive power rating is too low.
- Replace the AC drive with one of higher power rating.

3. The SVC control mode is adopted, and motor auto- tuning is not performed.
- Set the motor parameters according to the motor nameplate and perform motor auto-tuning.

4. The control mode is V/f control.
- Reduce the torque boost (F3-01) reference in decrements of 1.0%, or set it to 0 (auto torque boost).
E11.00
Motor
overload 		 Cause & Solution:

1. F9-01 (motor overload protection gain) is set improperly.
- Set F9-01 correctly. Increase its value to prolong the motor overload time.

2. The load is too heavy or locked-rotor occurs.
- Reduce the load and check the motor and mechanical conditions.
E12.01
Input voltage
exception		 Cause: Input voltage phase loss.

Solution:

- Check the three-phase power supply and make sure that it is normal.
- Check the input cables and make sure that they are not broken.
- Check the input terminals and make sure that they are properly connected
E12.04
Input voltage
exception		 Cause: The input three-phase voltage is too large.

Solution: Ensure that the input voltage does not exceed the rated value:
- Three-phase 380 V models: 576 V
- Single-phase 220 V models: 288 V
E13.00
Output phase
loss 		 Cause & Solution:

1. The motor is faulty.
- Check the motor for open circuit.
 
2. The cable connecting the AC drive and the motor is abnormal.
- Check the cable between the AC drive and the motor.

3. The three-phase outputs of the AC drive are unbalanced when the motor is running.
- Check whether the motor three-phase winding is normal. If not, eliminate the fault.

4. The drive board or the IGBT is abnormal.
- There is an hardware or software issue in drive. Need to repair or replace drive.
E14.00
IGBT overheat		 Cause & Solution:

1. The ambient temperature is too high.
- Reduce the ambient temperature.

2. The air filter is blocked.
- Clean the air filter.

3. The fan is damaged.
- Replace the fan.

4. The IGBT thermistor is damaged.
- There is an hardware or software issue in drive. Need to repair or replace drive.

5. The IGBT is damaged.
- There is an hardware or software issue in drive. Need to repair or replace drive.

 

How to Read MD800 Faults via InoDriveShop

To get the most accurate diagnostic data in 2026, it is highly recommended to connect your PC to the drive using the InoDriveShop software. This provides deeper insights than the standard keypad display.

  • Fault History: You can view the history of the last several faults. Crucially, the software records the drive’s status (voltage, current, frequency) at the exact moment the fault occurred.
  • Sub-Codes: Many Inovance errors (like Err10 or Err20) have “sub-codes” that are not always visible on the small LED display. Checking the sub-code in InoDriveShop pinpoints whether an overcurrent was caused by a short circuit to ground or a phase imbalance.
  • Oscilloscope Function: The MD800 software includes a powerful oscilloscope. You can trigger it to record waveform data (current/speed curves) the moment a fault happens, helping you distinguish between noise interference and genuine load issues.

Frequently Asked Questions (FAQ)

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

A: An Alarm (typically displayed as ‘ALm’ or ‘A’ codes) indicates an abnormal condition—such as overload pre-warning—but allows the system to continue operating. A Fault (displayed as ‘Err’ codes) immediately disables the output and stops the specific axis module to protect the inverter and motor.

Q: How do I reset an Inovance MD800 fault?

A: Once the underlying issue is resolved, you can reset the drive in three ways:

  1. Pressing the STOP/RESET button on the keypad unit.
  2. Triggering a configured Digital Input (DI) assigned to the “Reset” function.
  3. Sending a fault reset command via the communication bus (EtherCAT, PROFINET, or CANopen).

Q: Where is the fault history stored?

A: Fault history is stored in the U0 monitoring parameter group (often U0-00 through U0-09 depending on firmware version). This allows you to check recent error codes directly from the keypad without a PC.

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