Errors (Alarms); Error (Alarm) Definitions - Mitsubishi Electric FR-F500 Instruction Manual

5.1 Errors (Alarms)

If any fault has occurred in the inverter, the corresponding protective function is activated to bring the inverter
to an alarm stop and automatically give the corresponding error (alarm) indication on the PU display.
If your fault does not correspond to any of the following errors or if you have any other problem, please contact
your sales representative.
• When the protective function is activated, take the corresponding corrective action, then reset the inverter,
and resume operation.
• Resetting method
When the protective function is activated and the inverter has stopped its output, the inverter output is kept
stopped (and the motor is coasted to a stop). Unless reset, therefore, the inverter cannot restart. To reset,
use any of the following methods: switch power off once, then on again; short reset terminal RES-SD for
more than 0.1 seconds, then open; or press the [RESET] key of the operation panel or parameter unit (use
the help function of the parameter unit). If RES-SD are kept shorted, the operation panel shows "Err." and
the parameter unit indicates that the inverter is being reset.

5.1.1 Error (alarm) definitions

( 1 ) Major faults
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
E.OC1
Overcurrent shut-off during acceleration
When the inverter output current reaches or exceeds approximately 150% of the
rated current during acceleration, the protective circuit is activated to stop the
inverter output.
Check for sudden acceleration.
Check for output short circuit.
Increase the acceleration time.
E.OC2
Overcurrent shut-off during constant speed
When the inverter output current reaches or exceeds approximately 150% of the
rated current during constant speed, the protective circuit is activated to stop the
inverter output.
Check for sudden load change.
Check for output short circuit.
Keep load stable.
E.OC3
Overcurrent shut-off during deceleration
When the inverter output current reaches or exceeds approximately 150% of the
rated current during deceleration (other than acceleration or constant speed), the
protective circuit is activated to stop the inverter output.
Check for sudden speed reduction.
Check for output short circuit.
Check for too fast operation of motor's mechanical brake.
Increase the deceleration time.
Adjust brake operation.
PROTECTIVE FUNCTIONS
FR-PU04
FR-PU04
FR-PU04
155
OC During Acc
Stedy Spd OC
OC During Dec