Mitsubishi FR-D700 Fault Codes List

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Access the complete reference guide for Mitsubishi FR-D700 micro drive fault codes. Learn to diagnose E.OC1, safety stop (E.SAF) errors, and use the integrated digital dial.

Mitsubishi FR-D700 Fault Codes Reference Table

Use the search bar below or browse the table to identify your specific error code.

Mitsubishi FR-D700 Fault Codes List

Mitsubishi FR-D700 Fault Codes List

Fault Code and Meaning Cause and Remedy
HOLD

Operation panel lock		 Cause: Operation has been attempted during the operation panel lock.

Remedy:
Press MODE for 2s to release the lock.
LOCd

Password locked		 Cause: Reading/writing of a password-restricted parameter has been attempted.

Remedy:
Enter the password in Pr. 297 (Password lock/unlock) to unlock the password function before operating.
Er1

Write disable error		 Cause:
  • Parameter setting has been attempted although parameter writing is set to be disabled.
  • Overlapping range has been set for the frequency jump.
  • PU and the inverter cannot make normal communication.

Remedy:
  • Check the setting of Pr. 77 (Parameter write selection).
  • Check the settings of Pr. 31 to Pr. 36 (frequency jump).
  • Check the connection of PU and the inverter.
Er2

Write error during operation		 Cause: Parameter writing has been attempted while a value other than "2" is set in Pr. 77 and the STF (STR) is ON.

Remedy:
  • Set "2" in Pr. 77 (Parameter write selection).
  • After stopping the operation, set parameters.
Er3

Calibration error		 Cause: Analog input bias and gain calibration values have been set too close.

Remedy:
Check the settings of calibration parameters C3, C4, C6 and C7.
Er4

Mode designation error		 Cause:
  • Parameter setting attempted in External/NET mode when Pr. 77 is not "2".
  • Parameter writing attempted when command source is not operation panel.

Remedy:
  • Set operation mode to "PU operation mode".
  • Set "2" in Pr. 77.
  • Disconnect PU, set Pr. 551 = "9999".
  • Set Pr. 551 = "4".
Err.

Inverter reset		 Cause: The reset signal (RES signal) is ON (Inverter output is shutoff).

Remedy:
Turn OFF the reset command.
OL

Stall prevention (overcurrent)		 Cause: The overcurrent stall prevention has been activated.

Remedy:
  • Increase/decrease Pr. 0 Torque boost by 1%.
  • Set larger value in Pr. 7 Accel time and Pr. 8 Decel time.
  • Reduce load weight. Try General-purpose magnetic flux vector control.
  • Adjust Pr. 13 Starting frequency. Change Pr. 14 Load pattern.
  • Adjust Pr. 22 Stall prevention level.
oL

Stall prevention (overvoltage)		 Cause: The overvoltage stall prevention function has been activated.

Remedy:
Set the deceleration time longer.
rb

Regenerative brake pre-alarm		 Cause: The regenerative brake duty has reached 85% of the Pr. 70 setting or higher.

Remedy:
  • Set the deceleration time longer.
  • Check Pr. 30 and Pr. 70 settings.
TH

Electronic thermal relay pre-alarm		 Cause: The cumulative value of the electronic thermal O/L relay has reached 85% of the Pr. 9 setting.

Remedy:
  • Reduce the load and frequency of operation.
  • Set an appropriate value in Pr. 9.
PS

PU stop		 Cause: STOP/RESET on the operation panel has been pressed during External operation.

Remedy:
Turn the start signal OFF and release with PU/EXT.
MT

Maintenance signal output		 Cause: The cumulative energization time has exceeded the maintenance output timer set value.

Remedy:
Setting "0" in Pr. 503 Maintenance timer erases the signal.
Uu

Undervoltage		 Cause: The voltage at the main circuit power has been lowered.

Remedy:
Investigate the devices on the power supply line such as the power supply itself.
SA

Safety stop		 Cause: Safety stop function activating (Outputs are being shut off).

Remedy:
  • Short across terminals S1-SC and S2-SC if not using safety stop.
  • Check wiring of S1, S2, and SC.
  • Contact sales representative if wiring has no fault.
Fn

Fan alarm		 Cause: The cooling fan is at a standstill although it is required to be operated.

Remedy:
Check for fan failure. Please contact your sales representative.
E.OC1

Overcurrent trip during acceleration		 Cause: Overcurrent has occurred during acceleration.

Remedy:
  • Set acceleration time longer.
  • Disconnect motor and restart; if fault persists, inverter may be faulty.
  • Check wiring for short circuit/ground fault.
  • Set Pr. 3 Base frequency to 50Hz (if motor is 50Hz).
  • Lower stall prevention level.
  • Activate stall prevention (Pr. 156).
E.OC2

Overcurrent trip during constant speed		 Cause: Overcurrent has occurred during constant speed operation.

Remedy:
  • Keep load stable.
  • Check wiring for shorts/ground faults.
  • Lower stall prevention level.
E.OC3

Overcurrent trip during deceleration or stop		 Cause: Overcurrent has occurred during deceleration or at a stop.

Remedy:
  • Set deceleration time longer.
  • Check wiring for shorts/ground faults.
  • Check mechanical brake timing.
  • Lower stall prevention level.
E.OV1

Regenerative overvoltage trip during acceleration		 Cause: Overvoltage has occurred during acceleration.

Remedy:
  • Set acceleration time shorter.
  • Use regeneration avoidance function (Pr. 882, etc).
  • Set Pr. 22 Stall prevention correctly.
  • Set Pr. 154 = "11".
E.OV2

Regenerative overvoltage trip during constant speed		 Cause: Overvoltage has occurred during constant speed operation.

Remedy:
  • Keep load stable.
  • Use regeneration avoidance function.
  • Use brake resistor/unit/converter.
  • Set Pr. 154 = "11".
E.OV3

Regenerative overvoltage trip during deceleration		 Cause: Overvoltage has occurred during deceleration or at a stop.

Remedy:
  • Set deceleration time longer.
  • Make brake cycle longer.
  • Use regeneration avoidance function.
  • Use brake resistor/unit.
  • Set Pr. 154 = "11".
E.THT

Inverter overload trip		 Cause: The electronic thermal relay function for inverter element protection has been activated.

Remedy:
  • Set acceleration/deceleration time longer.
  • Adjust Pr. 0 Torque boost.
  • Adjust Pr. 14 Load pattern.
  • Reduce the load.
E.THM

Motor overload trip		 Cause: The electronic thermal relay function for motor protection has been activated.

Remedy:
  • Reduce the load.
  • For constant-torque motor, set Pr. 71.
  • Set stall prevention level accordingly.
E.FIN

Heatsink overheat		 Cause: The heatsink has overheated.

Remedy:
  • Set surrounding air temperature within specifications.
  • Clean the heatsink.
  • Replace cooling fan.
E.ILF

Input phase loss		 Cause: One of the three phases on the inverter input side has been lost or largely unbalanced.

Remedy:
  • Wire cables properly.
  • Repair cable breaks.
  • Check Pr. 872 setting.
E.OLT

Stall prevention stop		 Cause: The output frequency has dropped to 1Hz due to excess motor load deceleration.

Remedy:
Reduce the load. (Check Pr. 22).
E.BE

Brake transistor alarm detection		 Cause: A fault has occurred in the brake circuit (e.g., transistor breakage).

Remedy:
Replace the inverter.
E.GF

Output side earth fault overcurrent at start		 Cause: An earth (ground) fault occurred on the inverter's output side.

Remedy:
Remedy the ground fault portion.
E.LF

Output phase loss		 Cause: One of the three phases (U, V, W) on the inverter's output side has been lost.

Remedy:
  • Wire cables properly.
  • Check if motor capacity matches inverter.
E.OHT

External thermal relay operation		 Cause: The external thermal relay connected to the OH signal has been activated.

Remedy:
  • Reduce load and operate less frequently.
  • Reset the inverter.
E.PTC

PTC thermistor operation		 Cause: Resistance of the PTC thermistor reached the protection level.

Remedy:
Reduce the load.
E.PE

Parameter storage device fault		 Cause: Operation of the component where parameters are stored has become abnormal.

Remedy:
  • Contact sales representative.
  • If writing frequently, set Pr. 342 = "1" (RAM write).
E.PUE

PU disconnection		 Cause: Communication error between PU and inverter, or interval exceeded.

Remedy:
  • Connect PU cable securely.
  • Check communication settings.
  • Increase Pr. 122 interval or set to "9999".
E.RET

Retry count excess		 Cause: Operation restart within the set number of retries has failed.

Remedy:
Eliminate the cause of the error preceding this indication.
E.CPU

CPU fault		 Cause: An error has occurred in the CPU and in the peripheral circuits.

Remedy:
  • Take measures against electrical noise.
  • If persists, contact sales representative.
E.CDO

Output current detection value exceeded		 Cause: Output current has exceeded the output current detection level.

Remedy:
Check settings of Pr. 150, Pr. 151, Pr. 166, Pr. 167.
E.IOH

Inrush current limit circuit fault		 Cause: The resistor of the inrush current limit circuit has overheated.

Remedy:
Configure a circuit where frequent power ON/OFF is not repeated.
E.AIE

Analog input fault		 Cause: Voltage/Current input mismatch on Terminal 4 vs Pr. 267 setting.

Remedy:
Give frequency command by current input OR set Pr. 267 and switch to voltage correctly.
E.SAF

Safety circuit fault		 Cause: While safety circuit fault is occurring, terminals across S1/PC or S2/PC are opened.

Remedy:
  • Short terminals S1-SC and S2-SC if not using safety stop.
  • Check wiring of S1, S2, SC and safety relay module.
 

How to Read FR-D700 Faults via Keypad & Software

The FR-D700 is designed for simplicity, but accurate troubleshooting in 2026 requires understanding the integrated digital dial and PC connectivity:

  • Integrated Digital Dial: The D700 features a built-in center dial (M Dial).
    • Fault History: Press MODE until the “E.—” menu appears. This is the Fault History. You can view the last 8 faults. By pressing SET on a specific fault code, you can see the amperage and voltage recorded at the moment of the trip.
  • FR-Configurator2 (PC Software): To connect a PC, you need a USB-to-RS485 adapter (or the dedicated SC-09 cable) connected to the PU port (RJ-45). The software allows you to view the Life Diagnosis status to see if the main capacitor or inrush relay has reached the end of its service life.
  • Safety Stop Status: The D700 was one of the first micro drives to include hardwired safety. If the display shows “SA”, it is not a fault; it indicates the Safe Torque Off (STO) terminals are open.

Frequently Asked Questions (FAQ)

Q: What does “E.OC1” mean vs. “E.OC3”?

A: Overcurrent (OC) is broken down by when it occurs:

  • E.OC1 (Accel): Occurs during start-up. Check for a short circuit in the motor or a ramp time that is too fast (Pr. 7).
  • E.OC2 (Constant): Occurs while running at steady speed. Check for sudden load jams.
  • E.OC3 (Decel): Occurs while stopping. The load inertia is too high. Increase the deceleration time (Pr. 8) or add a brake resistor.

Q: How do I reset a Mitsubishi FR-D700 fault?

A:

  1. Press the STOP/RESET button on the drive face.
  2. Short terminals RES and SD (Sink logic) or RES and PC (Source logic) for 0.1 seconds.
  3. Power cycle the drive (Wait for the LED display to go completely dark).

Q: Why does the drive show “E.SAF”?

A: This indicates a Safety Circuit Fault.

  • The D700 has safety terminals S1, S2, and SC (or SIC).
  • If you are not using an external safety relay, ensure the factory-installed shorting wire is securely connected between S1-SC and S2-SC. If this wire is loose, the drive trips E.SAF.

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