Inovance MD290 Drive Fault Codes List
A comprehensive guide to Inovance MD290 general-purpose drive fault codes. Learn to interpret Err codes, troubleshoot conveyor/pump issues, and use InoDriveShop.
Inovance MD290 Fault Codes Reference Table
Below is the complete list of fault codes, descriptions, and potential solutions associated with the MD290 series.
| Fault Codes | Cause & Solution |
| Err02 Overcurrent during acceleration |
Cause &
Solution: 1. Ground fault or short circuit exists in the output circuit. - Check whether short-circuit occurs on the motor, the motor cable or contactor. 2. Acceleration time is too short. - Increase acceleration time. 3. Customized torque boost or V/F curve is not appropriate. - Adjust the customized torque boost or V/F curve. 4. The voltage is too low. - Adjust the voltage to normal range. 5. The spinning motor is started. - Enable the catching a spinning motor function or start the motor after it stops. 6. A load is applied suddenly during acceleration. - Cancel the suddenly added load. 7. The rated AC drive power is low. - Replace the drive by one with higher rated power. 8. The braking resistor resistance is small. - The braking resistor is short circuited. - Replace a new braking resistor. |
| Err03 Overcurrent during deceleration |
Cause &
Solution: 1. Ground fault or short circuit exists in the output circuit. - Check whether short-circuit occurs on motor, motor cable or contactor. 2. Acceleration time is too short. - Increase acceleration time. 3. The voltage is too low. - Adjust the voltage to normal range. 4. A load is added suddenly during deceleration. - Cancel the suddenly added load. 5. Braking unit and braking resistor are not installed. - Install the braking unit and braking resistor. 6. The braking resistor resistance is small or the braking resistor is short circuited. - Replace a new braking resistor. |
| Err04 Overcurrent at constant speed |
Cause &
Solution: 1. Ground fault or short circuit exists in the output circuit. - Check whether short-circuit occurs on the motor, motor cable or contactor 2. The voltage is too low. - Adjust the voltage to normal range. 3. A load is added suddenly during running. - Cancel the suddenly added load. 4. The rated AC drive power is low. - Replace the drive by one with higher rated power. 5. The braking resistor resistance is small or the braking resistor is short circuited. - Replace a new braking resistor. |
| Err05 Overvoltage during acceleration |
Cause &
Solution: 1. Input voltage is too high. - Adjust input voltage to normal range. 2. An external force drives motor during acceleration. - Cancel the external force. 3. Braking unit and braking resistor are not installed. - Install the braking unit and braking resistor. 4. Acceleration time is too short. - Increase acceleration time. |
| Err06 Overvoltage during deceleration |
Cause &
Solution: 1. Input voltage is too high. - Adjust input voltage to normal range. 2. An external force drives motor during deceleration. - Cancel the external force or install the braking resistor. 3. Deceleration time is too short. - Increase deceleration time. 4. Braking unit and braking resistor are not installed. - Install the braking unit and braking resistor. |
| Err07 Overvoltage at constant speed |
Cause &
Solution: 1. Input voltage is too high. - Adjust input voltage to normal range. 2. An external force drives motor during running. - Cancel the external force or install a braking resistor. |
| Err08 Pre-charge resistor fault |
Cause: Bus voltage fluctuates around undervoltage threshold
continuously Solution: There is an hardware or software issue in drive. Need to repair or replace drive. |
| Err09 Undervoltage |
Cause &
Solution: 1. An instantaneous power failure occurs. - Reset the fault 2. The AC drive's input voltage is not within the permissible range. - Adjust the voltage to normal range. 3. The bus voltage is abnormal. - Replace the AC drive. 4. The rectifier bridge, the pre-charge resistor, the drive board or the control board are abnormal. - Replace the AC drive. |
| Err10 Drive overload |
Cause &
Solution: 1. The load is too heavy or locked-rotor occurs on the motor. - Reduce the load or check motor and mechanical conditions. 2. The rated AC drive power is low. - Replace the drive by one with higher rated power. |
| Err11 Motor overload |
Cause &
Solution: 1. F9-01 (Motor overload protection gain) is set improperly. - Set F9-01 correctly. 2. The load is too heavy or locked-rotor occurs on the motor. - Reduce the load or check motor and mechanical conditions. 3. The rated AC drive power is low. - Replace the drive by one with higher rated power. |
| Err12 Input phase loss |
Cause &
Solution: 1. Three phase input is abnormal. - Eliminate faults in external circuitry 2. Drive board is abnormal. - Eliminate faults in external circuitry 3. Lightning protection board is abnormal. - There is an hardware or software issue in drive. Need to repair or replace drive. 4. Control board is abnormal. - There is an hardware or software issue in drive. Need to repair or replace drive. |
| Err13 Output phase loss |
Cause &
Solution: 1. Motor winding is damaged. Check resistance between motor cables. - Replace motor is winding is damaged. 2. The cable connecting the AC drive and the motor is abnormal. - Check for wiring errors and ensure the output cable is connected properly 3. The AC drive's three-phase outputs are unbalanced when the motor is running. - Check whether the motor three-phase winding is normal. 4. The drive board or the IGBT is abnormal. - Replace the AC drive. |
| Err14 IGBT overheat |
Cause &
Solution: 1. The ambient temperature is too high. - Lower the ambient temperature. 2. The ventilation is clogged. - Clean the ventilation. 3. The fan is damaged. - Replace the cooling fan. 4. The thermally sensitive resistor of IGBT is damaged. - Replace the AC drive. 5. The AC drive IGBT is damaged. - Replace the AC drive. |
| Err15 External fault |
Cause &
Solution: 1. External fault signal is input via DI. - Confirm that the mechanical condition allows restart (F8-18)and reset the operation. 2. External fault signal is input via virtual I/O. - Confirm that the virtual I/O parameters in group A1 are setcorrectly and reset the operation. |
| Err16 Communication fault |
Cause &
Solution: 1. The host controller is in abnormal state. - Check the cable of the host controller. 2. Communication cable is abnormal. - Check the communication cables. 3. Communication parameters in group Fd are set improperly. - Set communication parameters in group Fd properly. 4. After all the preceding checkings are done but the fault still exists, restore the default settings. |
| Err17 Contactor fault |
Cause &
Solution: 1. Drive board and power supply are abnormal. - Replace drive board or power supply board. 2. Contactor is abnormal. - Replace contactor. 3. The lightning protection board is abnormal. - Replace the lightning protection board. |
| Err18 Current detection fault |
Cause: The drive board is abnormal. Solution: There is an hardware or software issue in drive. Need to repair or replace drive. |
| Err19 Motor auto-tuning fault |
Cause &
Solution: 1. Motor parameters are not set according to nameplate. - Set motor parameters correctly according to nameplate. 2. Motor auto-tuning times out. - Check the cable connecting AC drive and motor. |
| Err21 EEPROM read- write fault |
Cause: EEPROM chip is damaged. Solution: Replace the AC drive. |
| Err23 Short circuit to ground |
Cause &
Solution: 1. The motor is short circuited to the ground. - Replace cable or motor. 2. The upper IGBT is damaged. - There is an hardware or software issue in drive. Need to repair or replace drive. |
| Err26 Accumulative running time reached |
Cause: Accumulative running time reaches the setting value. Solution: Clear the record through parameter initialization. |
| Err27 User-defined fault 1 |
Cause: User-defined fault 1 is input via DI. Solution: Reset the operation. |
| Err28 User-defined fault 2 |
Cause: User-defined fault 2 is input via DI. Solution: Reset the operation. |
| Err29 Accumulative power-on time reached |
Cause: Accumulative power-on time reaches the setting value. Solution: Clear the record through parameter initialization. |
| Err30 Off load fault |
Cause: The output current of AC drive is smaller than F9-64 (load
loss detection level). Solution: Check whether the load is disconnected or the setting of F9-64 and F9-65 (load lost detection time) satisfies actual running conditions. |
| Err31 PID feedback lost during running |
Cause: PID feedback is smaller than the setting value of FA-26
(detection level of PID feedback loss). Solution: Check PID feedback or set FA-26 properly. |
| Err40 Pulse-by- pulse current limit fault |
Cause &
Solution: 1. The load is too heavy or locked-rotor occurs on the motor. - Reduce the load or check motor and mechanical conditions. 2. The rated AC drive power is low. - Replace the drive by one with higher rated power. |
| Err41 Motor switchover fault during running |
Cause: Motor switchover via terminal during drive running of the AC
drive. Solution: Perform motor switchover after the AC drive stops. |
| Err45 Motor overtemperature |
Cause &
Solution: 1. Cable connection of temperature sensor becomes loose - Check cable connection of temperature sensor. 2. The motor temperature is too high. - Decrease carrier frequency or take other measures to cool the motor. |
| Err61 Braking unit overload |
Cause: Resistance of braking resistor is too small. Solution: Replace a braking resistor of larger resistance. |
| Err62 Short-circuit of braking circuit |
Cause: Braking IGBT is abnormal. Solution: There is an hardware or software issue in drive. Need to repair or replace drive. |
| HC Fault | Cause &
Solution: 1. The cable between the drive board and control board is in poor contact. 2. The control board is damaged. - Replace the AC drive. 3. The motor or motor cable is short circuited to ground. - Check whether short-circuit occurs on motor, motor cable or contactor. 4. The mains voltage is too low. - Check the power supply. |
How to Read MD290 Faults via InoDriveShop
While the MD290 features a user-friendly keypad, diagnosing intermittent or complex faults is much easier using the InoDriveShop PC software. In 2026, this digital approach is the standard for efficient maintenance.
- Fault Snapshot Data: When an “Err” code is triggered, the MD290 freezes its status parameters. Via the software or keypad group U0, you can review the exact Output Frequency, Current, and DC Bus Voltage at the moment of the trip. This is crucial for distinguishing between input power issues (like surges) and load issues.
- I/O Verification: Many MD290 faults stem from external wiring (e.g., a missing Enable signal or a tripped external sensor). InoDriveShop allows you to visualize the state of all Digital Inputs (DI) and Outputs (DO) to confirm if the PLC signals are valid.
- Trend Monitoring: For applications like fans or pumps, load fluctuates over time. The software’s oscilloscope function allows you to record long-term trends to see if a specific time of day or process stage is causing thermal overloads or over-current trips.
Frequently Asked Questions (FAQ)
Q: What is the difference between an Alarm and a Fault?
A: An Alarm (typically displayed as ‘A’ or ‘ALm’) serves as a warning—such as “Drive Overload Pre-alarm”—but the motor continues to run. A Fault (displayed as ‘Err’) is a protective stop that immediately disables the output to prevent hardware failure.
Q: How do I reset an Inovance MD290 fault?
A: You can reset the drive using the following methods:
- Pressing the STOP/RESET button on the keypad.
- Activating a Digital Input (DI) terminal programmed for the “Reset” function (Function 9).
- Cycling the power (turning the main breaker off, waiting for the LED to extinguish, and powering on again).
Q: Where is the fault history stored?
A: The MD290 stores the last 3 fault codes in parameters U0-00 (most recent), U0-01, and U0-02. The specific running parameters (volts, amps, etc.) recorded at the time of the most recent fault are stored in U0-03 through U0-17.
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