🧠 How the Inovance MD500 Reports Errors

When a fault occurs, the drive automatically stops output to protect the motor and displays an “ErrXX” code on its keypad. The TUNE/TC LED flashes, and a trip log is saved.

Type	Description	LED Behavior	Recovery
Fault (Err)	Stops drive output immediately.	LED flashes	Must be manually reset.
Warning (AL)	Alerts of an issue; continues running.	LED steady	Correct parameter or cooling.
Protection Stop	Stops output; self-resets after condition clears.	—	Auto reset when safe.

📘 Tip: Access F9-14 to F9-44 to view the last three fault logs (including voltage, current, and status at the time of failure).

🔁 How to Reset Faults

Method	Action	Use Case
Panel Reset	Press STOP/RES if F7-02 = 1.	Normal reset after fix.
DI Terminal Reset	Assign DI terminal function = 9 (Fault Reset).	Remote reset from PLC.
Power Cycle	Turn OFF then ON.	Clears latched faults.
Communication Reset	Set F0-02 = 2, write “7” to address 2000H.	Remote monitoring systems.

🧾 Inovance MD500 Error Codes and Solutions

Below is the comprehensive list of Inovance MD500 error codes (Err01–Err62), organized with fault names, causes, and corrective actions — extracted from the official manual and restructured for field use.

Error Code	Fault Name	Possible Causes	Solutions
Err02	Overcurrent during acceleration	Ground fault, short circuit, no auto-tuning, accel too short, wrong current limit, external interference.	Check motor wiring; perform auto-tuning; increase accel time; enable current limit (F3-19 = 1); adjust F3-18 (120–150%), F3-20 (20–40).
Err03	Overcurrent during deceleration	Short circuit, no auto-tuning, decel too short, missing brake resistor, interference.	Check cables; perform auto-tuning; install braking resistor; extend decel time.
Err04	Overcurrent at constant speed	Ground fault, improper torque boost, undersized drive, interference.	Inspect motor leads; reduce F3-01 torque boost; upgrade drive class.
Err05	Overvoltage during acceleration	Input voltage high, short accel time, regenerative energy.	Normalize supply; enable voltage limit (F3-23 = 1); install brake resistor; increase accel time.
Err06	Overvoltage during deceleration	Short decel, external force, missing resistor.	Enable voltage limit; increase decel time; install braking resistor.
Err07	Overvoltage at constant speed	External load feedback energy.	Install braking resistor; tune F3-22 (700–770 V); adjust F3-24 (30–50).
Err08	Pre-charge resistor fault	Bus voltage fluctuation.	Contact Inovance or agent.
Err09	Undervoltage	Power dip, supply out of range, rectifier fault.	Enable ride-through (F9-59 ≠ 0); stabilize input power; replace rectifier if faulty.
Err10	Drive overload	Heavy load or locked rotor.	Reduce mechanical load; use larger-rated drive.
Err11	Motor overload	Wrong F9-01 setting or excessive torque.	Set F9-01 correctly; reduce load.
Err12	Input phase loss	Missing phase or rectifier damage.	Inspect input R/S/T; check fuses; replace rectifier if needed.
Err13	Output phase loss	Broken motor winding, bad cable, or IGBT fault.	Check continuity; replace motor or drive board if unbalanced.
Err14	IGBT overheat	High temperature, blocked fan, sensor failure.	Clean vents; replace fan or sensor; reduce ambient temperature.
Err15	External fault	DI input or virtual I/O triggered.	Reset after clearing input (F8-18/A1 settings).
Err16	Communication fault	Wrong protocol, cable noise, Modbus setting mismatch.	Verify F0-28, Fd-group; check cable shielding.
Err17	Contactor fault	Relay or lightning board failure.	Replace defective boards or contactor.
Err18	Current detection fault	Hall sensor failure.	Replace hall sensor or drive board.
Err19	Auto-tuning fault	Wrong motor data, encoder issue.	Enter correct motor parameters; verify encoder wiring.
Err20	Encoder fault	Wrong type, damaged encoder, wiring error.	Correct encoder setting (F1-27); check PG card; replace encoder.
Err21	EEPROM fault	Memory failure.	Replace main control board.
Err23	Ground short circuit	Motor insulation failure.	Replace cable or motor; perform megger test.
Err26	Running time limit reached	Runtime limit triggered.	Reset via parameter initialization.
Err27 / Err28	User-defined faults	DI/virtual I/O triggered.	Reset; verify user logic settings.
Err29	Power-on time exceeded	Accumulated time limit reached.	Reset runtime counter.
Err30	Load loss	Output current < F9-64.	Reconnect load; adjust F9-64/F9-65.
Err31	PID feedback lost	Feedback signal below FA-26.	Check PID sensor; correct FA-26 threshold.
Err40	Pulse-by-pulse current limit	Heavy load or undersized drive.	Reduce torque; use higher-rated drive.
Err41	Motor switchover fault	Switched motor during run.	Switch only when stopped.
Err42	Speed error	Encoder data mismatch, no auto-tuning.	Perform auto-tuning; check F9-69/F9-70 values.
Err43	Overspeed	Encoder/parameter mismatch.	Perform auto-tuning; adjust F9-67/F9-68.
Err45	Motor overtemperature	High temperature or loose sensor wiring.	Tighten connections; improve cooling; reduce carrier frequency.
Err51	Braking unit overload	Resistor too small or frequent decel.	Replace with larger resistor; extend decel time.
Err62	Braking circuit short	Braking IGBT damaged.	Replace IGBT; contact Inovance.

🧮 Parameter Groups to Check

Parameter Group	Function	Notes
F3-xx	Voltage and current limit	Adjust F3-18, F3-22, F3-24 for stall and voltage protection.
F8-xx	DI/DO logic setup	Check F8-18 for restart permissions.
F9-xx	Protection and monitoring	F9-59 = ride-through; F9-64–F9-70 = load and speed error detection.
FA-xx	PID control parameters	Adjust FA-26 for feedback level detection.

⚠️ Safety Reminder: Before inspection or resetting, disconnect power for at least 10 minutes to allow DC bus capacitors to discharge.

🧰 Quick Troubleshooting Flow

1. Read code on display (e.g., “Err06”).
2. Check fault log (F9-14 – F9-44).
3. Verify motor and wiring for shorts, phase loss, or overheating.
4. Confirm parameters (F3, F8, F9) are within safe ranges.
5. Fix mechanical causes (load, fan, environment).
6. Reset drive via keypad or DI input.
7. Run test to confirm stability.

🔧 Preventive Maintenance

• Inspect fans, vents, and heatsinks quarterly.
• Use shielded cables and grounded wiring to minimize EMI.
• Perform motor auto-tuning after replacement or rewiring.
• Back up parameters before firmware or hardware changes.
• Monitor F9-05 (DC bus voltage) and U4-xx (lifetime counters) regularly.

✅ Summary

The Inovance MD500 error codes system provides a structured, intelligent diagnostic method to keep your VFDs healthy.
From simple faults like Err02 (Overcurrent) to complex control issues like Err20 (Encoder fault), each code reflects a specific hardware or operational problem — and offers clear guidance for resolution.

By learning these codes and keeping your parameters optimized, you can dramatically reduce unplanned downtime and extend the life of your Inovance MD500 drive.