Mitsubishi FR-F700 Drive

Mitsubishi FR-F700 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
HOLD
Operation panel lock
Cause: Operation lock mode is set. Operation other than STOP/RESET is invalid.



Remedy:

  • Press MODE for 2s to release lock.
Er1
Write disable error
Cause:

  • Attempted parameter setting when Pr. 77 is set to disable write.

  • Frequency jump setting range overlapped (Pr. 31-36).

  • Adjustable 5 points V/F settings overlapped (Pr. 100-109).

  • The PU and inverter cannot make normal communication.




Remedy:

  • Check the setting of Pr. 77 Parameter write selection.

  • Check the settings of Pr. 31 to 36 (frequency jump).

  • Check the settings of Pr. 100 to Pr. 109 (Adjustable 5 points V/F).

  • Check the connection of the PU and inverter.
Er2
Write error during operation
Cause: Parameter write was performed during operation with a value other than “2” in Pr. 77 and the STF (STR) is on.



Remedy:

  • Set “2” in Pr. 77.

  • After stopping operation, make parameter setting.
Er3
Calibration error
Cause: Analog input bias and gain calibration values are too close.



Remedy:

  • Check the settings of C3, C4, C6 and C7 (calibration functions).
Er4
Mode designation error
Cause:

  • Attempted to make parameter setting in the NET operation mode when Pr. 77 is not “2”.

  • Parameter write performed when the command source is not at the operation panel.




Remedy:

  • Check that operation mode is “PU operation mode”.

  • Set “2” in Pr. 77 (Parameter write selection).

  • Check the Pr. 551 setting; set Pr. 551 = “2”.
rE1
Parameter read error
Cause: An error occurred in the EEPROM on the operation panel side during parameter copy reading.



Remedy:

  • Make parameter copy again.

  • Check for an operation panel (FR-DU07) failure.
rE2
Parameter write error
Cause:

  • Attempted to perform parameter copy write during operation.

  • An error occurred in the EEPROM on the operation panel side during parameter copy writing.




Remedy:

  • After stopping operation, make parameter copy again.

  • Check for an operation panel (FR-DU07) failure.
rE3
Parameter verification error
Cause:

  • Data on the operation panel side and inverter side are different.

  • An error occurred in the EEPROM on the operation panel side during parameter verification.




Remedy:

  • Press SET to continue verification.

  • Make parameter verification again.

  • Check for an operation panel failure.
rE4
Model error
Cause:

  • A different model was used for parameter write and verification during parameter copy.

  • Parameter copy write is stopped after parameter copy read is stopped.




Remedy:

  • Use the same model (FR-F700 series) for parameter copy and verification.

  • Perform parameter copy read again.
Err.
Communication/Power Error
Cause:

  • The RES signal is on.

  • The PU and inverter cannot make normal communication (connector fault).

  • Voltage drop in the inverter’s input side.

  • Control circuit power and main circuit power are connected to separate power.




Remedy:

  • Turn off the RES signal.

  • Check the connection of the PU and inverter.

  • Check the voltage on the inverter’s input side.
OL
Stall prevention (overcurrent)
Cause: The output current exceeds the stall prevention operation level (Pr. 22). The inverter stops frequency increase/decrease to prevent overcurrent trip.



Remedy:

  • Check that Pr. 0 Torque boost setting is not too large.

  • Check that Pr. 7 Acceleration time and Pr. 8 Deceleration time are not too small.

  • Reduce the load weight.

  • Try Simple magnetic flux vector control (Pr. 80).

  • Increase the stall prevention operation level (Pr. 22).
oL
Stall prevention (overvoltage)
Cause: Regenerative energy from the motor becomes excessive. The inverter stops frequency decrease to prevent overvoltage trip.



Remedy:

  • Check for sudden speed reduction.

  • Check if Regeneration avoidance function (Pr. 882) is being used.

  • Increase the deceleration time using Pr. 8 Deceleration time.
PS
PU stop
Cause: Stop with STOP/RESET of the PU is set in Pr. 75. Stop made by pressing STOP/RESET.



Remedy:

  • Turn the start signal off and release with PU/EXT.
RB
Regenerative brake prealarm
Cause: Regenerative brake duty reaches or exceeds 85% of the Pr. 70 setting.



Remedy:

  • Check that the brake resistor duty is not high.

  • Increase the deceleration time.

  • Check Pr. 30 and Pr. 70 settings.
TH
Electronic thermal relay prealarm
Cause: Cumulative value of Pr. 9 Electronic thermal O/L relay reaches or exceeds 85% of the preset level. Large load or sudden acceleration.



Remedy:

  • Reduce the load weight or the number of operation times.

  • Set an appropriate value in Pr. 9.
MT
Maintenance signal output
Cause: Cumulative energization time has reached the limit set in Pr. 503/504.



Remedy:

  • Setting “0” in Pr. 503 Maintenance timer erases the signal.
CP
Parameter copy
Cause: Parameters are copied between models with capacities of 55K or less and 75K or more.



Remedy:

  • Resetting of specific parameters (Pr. 9, 30, 51, 52, 54, 56, 57, 70, 72, 80, 90, 158, 190-196, 557, 893) is necessary.

  • Set the initial value in Pr. 989 Parameter copy alarm release.
FN
Fan alarm
Cause: Cooling fan stops due to a fault or different operation from the setting of Pr. 244.



Remedy:

  • Check the cooling fan for an alarm.

  • Check for fan failure. Please contact your sales representative.
E.OC1
Overcurrent trip during acceleration
Cause:

1. Check for sudden acceleration.

2. Check that the downward acceleration time is not long in vertical lift application.

3. Check for output short circuit.

4. Check that the Pr. 3 Base frequency setting is not 60Hz when motor is 50Hz.

5. Check that stall prevention operation is correct.

6. Check for frequent regeneration.


Remedy:


  • Increase the acceleration time.

  • If “E.OC1” is always lit at starting, disconnect the motor and start inverter to isolate.

  • Check the wiring to make sure that output short circuit does not occur.

  • Set the Pr. 3 Base frequency to 50Hz.

  • Perform a correct stall prevention operation setting.

  • Set base voltage in Pr. 19.
E.OC2
Overcurrent trip during constant speed
Cause:

1. Check for sudden load change.

2. Check for output short circuit.

3. Check that stall prevention operation is correct.


Remedy:


  • Keep load stable.

  • Check the wiring to avoid output short circuit.

  • Check that stall prevention operation setting is correct.
E.OC3
Overcurrent trip during deceleration or stop
Cause:

1. Check for sudden speed reduction.

2. Check for output short circuit.

3. Check for too fast operation of the motor’s mechanical brake.

4. Check that stall prevention operation setting is correct.


Remedy:


  • Increase the deceleration time.

  • Check the wiring to avoid output short circuit.

  • Check the mechanical brake operation.

  • Check that stall prevention operation setting is correct.
E.OV1
Regenerative overvoltage trip during acceleration
Cause:

1. Check for too slow acceleration (e.g. descending with lifting load).

2. Check that Pr. 22 Stall prevention level is not lower than no load current.


Remedy:


  • Decrease the acceleration time.

  • Use regeneration avoidance function (Pr. 882 to Pr. 886).

  • Set a value larger than the no load current in Pr. 22.
E.OV2
Regenerative overvoltage trip during constant speed
Cause:

1. Check for sudden load change.

2. Check that Pr. 22 Stall prevention level is not lower than no load current.


Remedy:


  • Keep load stable.

  • Use regeneration avoidance function (Pr. 882 to Pr. 886).

  • Use the brake unit or power regeneration common converter (FR-CV).

  • Set a value larger than the no load current in Pr. 22.
E.OV3
Regenerative overvoltage trip during deceleration or stop
Cause:

Check for sudden speed reduction.


Remedy:


  • Increase the deceleration time (match moment of inertia of load).

  • Longer the brake cycle.

  • Use regeneration avoidance function (Pr. 882 to Pr. 886).

  • Use the brake unit or power regeneration common converter (FR-CV).
E.THT
Inverter overload trip (electronic thermal relay function)
Cause:

Check that acceleration/deceleration time is not too short.

Check that torque boost setting is not too large.

Check that load pattern selection is appropriate.

Check the motor for use under overload.


Remedy:


  • Increase acceleration/deceleration time.

  • Adjust the torque boost setting.

  • Set the load pattern selection setting according to the machine.

  • Reduce the load weight.
E.THM
Motor overload trip (electronic thermal relay function)
Cause:

1. Check the motor for use under overload.

2. Check that the setting of Pr. 71 Applied motor is correct.

3. Check that stall prevention operation setting is correct.


Remedy:


  • Reduce the load weight.

  • For a constant-torque motor, set the constant-torque motor in Pr. 71.

  • Check that stall prevention operation setting is correct.
E.FIN
Fin overheat
Cause:

1. Check for too high surrounding air temperature.

2. Check for heatsink clogging.

3. Check that the cooling fan is stopped.


Remedy:


  • Set the surrounding air temperature to within the specifications.

  • Clean the heatsink.

  • Replace the cooling fan.
E.IPF
Instantaneous power failure
Cause:

Find the cause of instantaneous power failure occurrence.


Remedy:


  • Remedy the instantaneous power failure.

  • Prepare a backup power supply.

  • Set the function of automatic restart after instantaneous power failure (Pr. 57).
E.BE
Brake transistor alarm detection/internal circuit fault
Cause:

Reduce the load inertia.

Check that the frequency of using the brake is proper.

Check that the brake resistor selected is correct.


Remedy:


  • For 75K or more: replace the brake unit with a new one.

  • For 55K or less: replace the inverter.
E.UVT
Undervoltage
Cause:

1. Check for start of large-capacity motor.

2. Check that a jumper or DC reactor is connected across P/+-P1.


Remedy:


  • Check the power supply system equipment.

  • Connect a jumper or DC reactor across terminals P/+-P1.

  • If problem persists, contact sales representative.
E.ILF
Input phase loss
Cause:

Check for a break in the cable for the three-phase power supply input.


Remedy:


  • Wire the cables properly.

  • Repair a break portion in the cable.

  • Check the Pr. 872 Input phase loss protection selection setting.
E.OLT
Stall prevention
Cause:

Check the motor for use under overload.


Remedy:


  • Reduce the load weight.
E.GF
Ground Fault
Cause:

Check for an earth (ground) fault in the motor and connection cable.


Remedy:


  • Remedy the earth (ground) fault portion.
E.LF
Output phase loss
Cause:

Check the wiring (Check that the motor is normal).

Check that the capacity of the motor used is not smaller than that of the inverter.


Remedy:


  • Wire the cables properly.

  • Check the Pr. 251 Output phase loss protection selection setting.
E.OHT
OH Fault (External thermal relay)
Cause:

Check for motor overheating.

Check that the value of 7 (OH signal) is set correctly in Pr. 178 to Pr. 189.


Remedy:


  • Reduce the load and operating duty.

  • Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.

E.PTC (Fault 14)


PTC thermistor operation

Trips when the motor overheat status is detected for 10s or more by the external PTC thermistor input connected to the terminal AU.

Cause:

  • Check the connection between the PTC thermistor switch and thermal relay protector.

  • Check the motor for operation under overload.

  • Is valid setting (= 63) selected in Pr. 184 AU terminal function selection?




Remedy:

Reduce the load weight.

E.OPT (Option Fault)


Option fault

Appears when the AC power supply is connected to the terminal R/L1, S/L2, T/L3 accidentally when a high power factor converter is connected. Appears when the switch for the manufacturer setting of the plug-in option is changed.

Cause:

  • Check that the AC power supply is not connected to the terminal R/L1, S/L2, T/L3 when a high power factor converter (FR-HC, MT-HC) or power regeneration common converter (FR-CV) is connected.

  • Check the parameter (Pr. 30) setting and wiring.




Remedy:


  • The inverter may be damaged if the AC power supply is connected to the terminal R/L1, S/L2, T/L3 when a high power factor converter is connected. Please contact your sales representative.

  • Return the switch for the manufacturer setting of the plug-in option to the initial status.

E.OP1 (Option 1 Fault)


Communication option fault

Stops the inverter output when a communication line fault occurs in the communication option.

Cause:

  • Check for a wrong option function setting and operation.

  • Check that the plug-in option is plugged into the connector securely.

  • Check for a break in the communication cable.

  • Check that the terminating resistor is fitted properly.




Remedy:


  • Check the option function setting, etc.

  • Connect the plug-in option securely.

  • Check the connection of communication cable.

E.1 (Fault 1)


Option fault

Stops the inverter output if a contact fault or the like of the connector between the inverter and communication option occurs. Appears when the switch for the manufacturer setting of the plug-in option is changed.

Cause:

  • Check that the plug-in option is plugged into the connector securely.

  • Check for excess electrical noises around the inverter.




Remedy:


  • Connect the plug-in option securely.

  • Take measures against noises if there are devices producing excess electrical noises around the inverter.

  • If the problem still persists after taking the above measure, please contact your sales representative.

  • Return the switch position for the manufacturer setting of the plug-in option to the initial status.

E.PE (Corrupt Memory)


Parameter storage device fault (control circuit board)

Trips when a fault occurred in the parameter stored (EEPROM failure).

Cause:
Check for too many number of parameter write times.


Remedy:


  • Please contact your sales representative.

  • When performing parameter write frequently for communication purposes, set “1” in Pr. 342 to enable RAM write. (Note: powering off returns the inverter to the status before RAM write).

E.PE2 (Fault 14)


Parameter storage device fault (main circuit board)

Trips when a fault occurred in the parameter stored (EEPROM failure).

Cause:
Internal circuit board error.


Remedy:

Please contact your sales representative.

E.PUE (PU Leave Out)


PU disconnection

This function stops the inverter output if communication between the inverter and PU is suspended (e.g. disconnected).

Cause:

  • Check that the FR-DU07 or parameter unit is fitted tightly.

  • Check the Pr. 75 setting.




Remedy:

Fit the FR-DU07 or parameter unit (FR-PU04/FR-PU07) securely.

E.RET (Retry No Over)


Retry count excess

If operation cannot be resumed properly within the number of retries set, this function trips the inverter.

Cause:
Find the cause of the original fault occurrence.


Remedy:

Eliminate the cause of the fault preceding this error indication.

E.5 / E.6 / E.7 / E.CPU


CPU Fault

Stops the inverter output if the communication fault of the built-in CPU occurs.

Cause:
Check for devices producing excess electrical noises around the inverter.


Remedy:


  • Take measures against noises if there are devices producing excess electrical noises around the inverter.

  • Please contact your sales representative.

E.CTE


Operation panel power supply short circuit / RS-485 terminal power supply short circuit

When the operation panel power supply or RS-485 internal power supply is shorted.

Cause:

  • Check for a short circuit in the PU connector cable.

  • Check that the RS-485 terminals are connected correctly.




Remedy:


  • Check the PU and cable.

  • Check the connection of the RS-485 terminals.

E.P24


24VDC power output short circuit

When the 24VDC power output from the PC terminal is shorted.

Cause:
Check for a short circuit in the PC terminal output.


Remedy:

Remedy the earth (ground) fault portion.

E.CDO (Fault 14)


Output current detection value exceeded

This function stops the inverter output when the output current exceeds the setting of Pr. 150 or falls below Pr. 152.

Cause:
Check the settings of:

  • Pr. 150 Output current detection level

  • Pr. 151 Output current detection signal delay time

  • Pr. 152 Zero current detection level

  • Pr. 153 Zero current detection time

  • Pr. 166 Output current detection signal retention time

  • Pr. 167 Output current detection operation selection




Remedy:

Adjust parameters listed in Cause (Refer to chapter 4 of Instruction Manual).

E.IOH (Fault 14)


Inrush overheat

Trips when the resistor of the inrush current limit circuit overheats.

Cause:

  • Check that frequent power ON/OFF is not repeated.

  • Check that no meltdown is found in the primary side fuse (5A) in the power supply circuit.

  • Check that the power supply circuit of inrush current limit circuit contactor is not damaged.




Remedy:


  • Configure a circuit where frequent power ON/OFF is not repeated.

  • If the problem still persists after taking the above measure, please contact your sales representative.

E.SER (Fault 14)


Communication fault (inverter)

Stops the inverter output when communication error occurs consecutively for more than permissible retry count.

Cause:
Check the RS-485 terminal wiring.


Remedy:

Perform wiring of the RS-485 terminals properly.

E.AIE (Fault 14)


Analog input fault

Trips when 30mA or more is input or a voltage (7.5V or more) is input with the terminal 2/4 set to current input.

Cause:
Check the setting of Pr. 73 Analog input selection and Pr. 267 Terminal 4 input selection.


Remedy:

Either give a frequency command by current input or set Pr. 73 or Pr. 267 to voltage input.

E.PID (Fault 14)


PID signal fault

If any of PID upper limit, lower limit, and PID deviation limit turns ON during PID control.

Cause:

  • Check if the measured PID value is greater than the upper limit (Pr.131) or smaller than the lower limit (Pr.132).

  • Check if the absolute PID deviation value is greater than the limit value (Pr.553).




Remedy:

Make correct settings for Pr.131 PID upper limit, Pr.132 PID lower limit, Pr.553 PID deviation limit.

E.13 (Fault 13)


Internal circuit fault

Trips when an internal circuit error occurred.

Cause:
Internal component error.


Remedy:

Please contact your sales representative.