Mitsubishi FR-V220E Fault Codes List

Diagnose issues with your Mitsubishi FR-V220E Vector Inverter using our troubleshooting guide. Decode “E.” fault codes, check encoder feedback errors, and learn reset procedures to minimize downtime.

FR-V220E Fault Codes Reference Table

Below is the comprehensive list of fault codes for the Mitsubishi FR-V220E vector inverter:

Mitsubishi FR-V220E Fault Codes List

Mitsubishi FR-V220E Fault Codes List

Fault Code and Meaning Cause and Remedy
OC During Acc
E.OC1

Overcurrent during acceleration 		Cause:
Overcurrent. Main circuit device overheat.

Remedy:
  • Check if acceleration is too fast.
  • Check for output short circuit or ground fault.
  • Check for cooling fan stop.
  • Increase acceleration time.
  • Change fan. Remove obstacle to cooling fan.
Stedy Spd Oc
E.OC2

Overcurrent during constant speed 		Cause:
Overcurrent. Main circuit device overheat.

Remedy:
  • Check for sudden load change.
  • Check for output short circuit or ground fault.
  • Check for cooling fan stop.
  • Keep load stable.
  • Change fan. Remove obstacle to cooling fan.
OC During Dec
E.OC3

Overcurrent during deceleration 		Cause:
Overcurrent. Main circuit device overheat.

Remedy:
  • Check if deceleration is too fast.
  • Check for output short circuit or ground fault.
  • Check for cooling fan stop.
  • Check if mechanical brake operates too fast.
  • Increase deceleration time.
  • Check brake operation.
Ov During Acc
E.OV1

Overvoltage during acceleration 		Cause:
Overvoltage on DC bus (terminals P (+) and N (-)).

Remedy:
  • Check if acceleration is too fast.
  • Increase acceleration time.
Stedy Spd Ov
E.OV2

Overvoltage during constant speed 		Cause:
Overvoltage on DC bus (terminals P (+) and N (-)).

Remedy:
  • Check for sudden load change.
  • Keep load stable.
Ov During Dec
E.OV3

Overvoltage during deceleration 		Cause:
Overvoltage on DC bus (terminals P (+) and N (-)).

Remedy:
  • Check if deceleration is too fast.
  • Increase deceleration time (Set deceleration time which matches load GD²).
  • Reduce braking duty.
Motor Overload
THM

Overload alarm (Thermal relay for motor) 		Cause:
Motor used under overload.

Remedy:
  • Reduce load.
  • Increase motor and inverter capacities.
Inv. Overload
THT

Overload alarm (Thermal relay for inverter) 		Cause:
Motor used under overload.

Remedy:
  • Reduce load.
  • Increase motor and inverter capacities.
Inst. Pwr. Loss
IPF

Instantaneous power failure 		Cause:
Instantaneous power failure.

Remedy:
  • Check the cause of instantaneous power failure.
  • Investigate power supply system.
Under Voltage
UVT

Undervoltage 		Cause:
Drop of power supply voltage. No jumper across terminals P (+) - P1.

Remedy:
  • Large-capacity motor started?
  • Check for jumper across terminals P (+) - P1.
  • Check power system equipment such as power supply capacity.
  • Install jumper if disconnected.
Br. Cct. Fault
BE

Brake transistor alarm 		Cause:
Brake transistor fault (only 5.5K or less).

Remedy:
  • Check if braking duty is proper.
  • Reduce load GD².
  • Reduce braking duty.
Overspeed occurrence
OS

Overspeed occurrence 		Cause:
The motor speed exceeded the set overspeed level.

Remedy:
  • Check Pr. 69 "number of PLG pulses" setting correctness.
  • Set Pr. 69 "number of PLG pulses" value correctly.
OH Fault
OHT

External thermal relay operation 		Cause:
Temperature detector in motor operated.

Remedy:
  • Check motor for overheat.
  • Reduce load and frequency of operation.
Stll Prev STP
OLT

Stall prevention 		Cause:
Stall prevention or current limit function activated too long.

Remedy:
  • Check if motor is used under overload.
  • Reduce load.
  • Increase motor and inverter capacities.
Option Fault
OPT

Inboard option connection alarm 		Cause:
Option and inverter connected improperly.

Remedy:
  • Check for loose connector.
  • Securely connect.
Corrupt Memry
PE

Parameter storage device alarm 		Cause:
Storage device (E²PROM) fault.

Remedy:
  • Number of parameter write times too many?
  • Change inverter.
Excessive speed deflection
OSD

Excessive speed deflection 		Cause:
The deflection between the speed setting and motor speed exceeded the deflection level.

Remedy:
  • Is the load too large?
  • Check Pr. 69 "number of PLG pulses" setting correctness.
  • Lighten the load.
  • Set Pr. 69 "number of PLG pulses" value correctly.
PU Leave Out
PUE

PU disconnected 		Cause:
PU disconnected from connector.

Remedy:
  • Check for loose PU fitting.
  • Fit PU securely.
CPU Fault
CPU

CPU error 		Cause:
Internal CPU malfunction.

Remedy:
  • Check for loose connector.
  • Change inverter.
No encoder signal
ECT

No encoder signal 		Cause:
The PLG pulse is not being input.

Remedy:
  • Check for loose connector.
  • Check for wire breakage in cable.
  • Securely connect.
  • Replace cable.
PU to Inverter comms. Error
0.00 (LED display proper)

Inv. Reset ON 		Cause:
Reset signal ON. Loose connection between PU and inverter. Communication circuit fault.

Remedy:
  • Check for miswiring to reset terminal.
  • Check for loose connector.
  • Turn the reset signal off.
  • Securely connect.
  • Change inverter.
Excessive position error
OD

Position error large 		Cause:
Difference between position command and position feedback exceeded detection level.

Remedy:
  • Check that the installation direction of the encoder for position detection and parameters match.
  • Is the load too large?
  • Check Pr. 69 "number of PLG pulses" setting correctness.
  • Check the parameters.
  • Lighten the load.
  • Set Pr. 69 "number of PLG pulses" value correctly.
No encoder A signal
ECA

No encoder signal 		Cause:
The PLG pulse for the FR-VPA is not being input.

Remedy:
  • FR-VPA connected properly?
  • Check for loose connector.
  • Check for wire breakage in cable.
  • Check for detector fault.
  • Securely connect.
  • Replace cable.
  • Replace the detector.
 

How to Read FR-V220E Faults via Parameter Unit

Because the FR-V220E is a vector control drive, diagnostics are slightly more complex than standard inverters. You can read faults using the built-in LED display or an external Parameter Unit (FR-PU series).

1. The 7-Segment LED Display

On the face of the drive, the 4-digit LED display will flash the current error code (e.g., E.OS or E.ECT).
Note: If multiple faults occur simultaneously, the display will cycle through them.

2. Alarm History (Parameter Unit)

Using the FR-PU04 or compatible Parameter Unit is essential for this drive. By accessing the Alarm History menu, you can see the last 8 fault records.
Crucially, pressing the “SHIFT” key while viewing a history entry will display voltage, current, and frequency data recorded at the exact moment the drive tripped.

3. Vector-Specific Checks (Encoder Feedback)

Since the V220E uses closed-loop control, pay close attention to the Monitor Mode. Check the “Motor Speed” vs. “Command Speed.” A significant deviation often precedes an E.OS (Overspeed) or E.SE (Speed Error) fault, indicating encoder coupling slippage or noise.

Frequently Asked Questions (FAQ)

Q: What does Fault E.ECT (Encoder Cable Open) mean?

A: This is specific to the V220E vector drive. It indicates that the drive is not receiving a signal from the PLG (Pulse Generator/Encoder). Check for:

  • A disconnected or broken encoder cable.
  • Incorrect wiring sequence (A/B phases).
  • A failed encoder power supply.

Q: How do I reset the FR-V220E?

A: You can reset the drive via:

  • Panel Reset: Press the STOP/RESET key on the Parameter Unit.
  • External Reset: Short the terminals RES and SD for at least 0.1 seconds.
  • Power Cycle: Turn off the main power and wait for the “CHARGE” lamp to extinguish completely before powering back on.

Q: Why am I getting an E.UVT (Undervoltage) fault while running?

A: If E.UVT occurs during operation (not just at startup), it often indicates that the large capacity contactor (73) inside the inverter has failed or the P-P1 short bar is loose. It can also result from a momentary power dip in the facility.

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