STARTING GUIDE FRENIC-Eco . FRN-F1 - Welcome to Fuji Electric

7. TROUBLESHOOTING
Alarm code Alarm Name Alarm contents
OC1 Overcurrent during acceleration
OC2 Overcurrent during deceleration
OC3 Overcurrent at constant speed
The inverter output current has exceeded the overcurrent level.
Possible causes: short-circuit in the output phase, F09 too large, ground faults,
EMC noise, acceleration/deceleration times are too short or motor load is too
heavy.
EF Ground fault (90kW or above) A ground fault current flowed from the inverter output to the ground.
OU1 Overvoltage during acceleration
OU2 Overvoltage during deceleration
OU3 Overvoltage at constant speed
The internal DC-Voltage has exceeded the overvoltage level.
Possible causes: the input voltage is too high, the braking load is too high or the
deceleration time is too short.
LU Undervoltage The DC voltage is below the undervoltage level.
Lin Input phase loss The unbalance between the input phases is too big.
OPL Output phase loss One output phase is not connected or has no load.
OH1 Heat sink overheat The temperature of the heat sink has exceeded the alarm level.
OH2 Alarm issued by an external device THR external failure. Check the external device which is connected to the
inverter.
OH3 Inside of the inverter overheat The temperature inside the inverter has exceeded the alarm level.
OH4 Motor protection (PTC thermistor) PTC failure. Probably the motor temperature is too high.
FUS Fuse blown (90kW or above) The fuse inside the inverter is blown.
PbF Charger circuit fault (55kW or above) The magnetic contactor (MC) failed. This MC is inside the inverter and shortcircuits
the charging resistor.
OL1 Electronic thermal overload relay Inverter detects an overload of the connected motor (related function codes
F10 to F12).
OLU Inverter overload The temperature inside the inverter is too high or the load is too heavy.
Er1 Memory error An error occurred while writing data to inverter memory.
Er2 Keypad communications error Communication error between the remote keypad and the inverter.
Er3 CPU error The CPU is not working properly.
Er4 Option board communications error Communication error between the option board and the inverter. Refer to the
option manual.
Er5 Option board error An error has been detected by the option board. Refer to the option manual.
Er6 Incorrect operation error Check setting of H96.
Er7 Autotuning error Auto-tuning failed (check motor connections, motor parameters, check if
main contactors are being closed properly and check if there is a BX or BBX
functions assigned to a ON level digital input).
Er8 RS485 communications error A communication error occurred during RS485 communication.
ErF Data saving error during undervoltage The inverter was not able to save the frequency command and PID process
command set by the keypad when the power was cut off.
ErP RS485 communications error
(option board)
A communication error occurred during RS485 communication through the
RS485 option board.
ErH Power PCB error (55kW or above) Failure caused by an internal inverter board.
For further information about alarm codes please refer to the FRENIC-Eco user's manual.
Chapter 7: Troubleshooting
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