Instruction manual

74
Errors (Alarms)
6 ERRORS AND PROTECTIVE FUNCTIONS
6.1 Errors (Alarms)
When an alarm occurs in the inverter, the protective function is activated bringing the inverter to an alarm stop and
the PU display automatically changes to any of the following error (alarm) indications.
If the fault does not correspond to any of the following errors or if you have any other problem, please contact your
sales representative or distributor.
z Retenation of alarm output signal....... When the alarm output signal holding protective function is activated,
opening the magnetic contactor (MC) provided on the inverter's power
supply side will cause the control power of the inverter to be lost and the
alarm output not to be held.
z Alarm indication.................................. When the alarm display protective function is activated, the control panel
display section is changed automatically.
z Resetting method ............................... When the resetting method protective function is activated, the inverter
output stop status is held, and the inverter cannot restart unless it is reset.
To reset, switch power off once, then on again, or turn on the RES signal
for more than 0.1s.
If the RES signal is kept on, "Err." appears (flickers) to indicate that the
inverter is in a reset status.
z When any protective function is activated, take the appropriate corrective action, then reset the inverter, and
resume operation.
6.1.1 Major faults
When the protective function is activated, the inverter output is shut off and an alarm is output.
*1: E. OC3 appears if the overcurrent shutoff occurs during positioning.
Control Panel
Indication
E.OC1 FR-PU04V OC During Acc
Name
Overcurrent shut-off during acceleration (*1)
Description
• When the inverter output current reaches or exceeds approximately 200% of the rated inverter
current during acceleration, the protective circuit is activated to stop the inverter output.
• Power is supplied to only the R1 and S1 terminals. This indication also appears when the start
signal is entered.
Check point
• Check for sudden acceleration.
• Check for long descending acceleration time of lift applications
• Check for output short circuit.
• Check that main circuit power (R, S, T) is supplied.
Corrective action
• Decrease the acceleration time.
• Supply main circuit power (R, S, T).
Control Panel
Indication
E.OC2 FR-PU04V Stedy Spd OV
Name
Overcurrent shut-off during constant speed (*1)
Description
When the inverter output current reaches or exceeds approximately 200% of the rated inverter
current during constant speed operation, the protective circuit is activated to stop the inverter
output.
Check point
• Check for sudden load change.
• Check for output short circuit.
Corrective action
Keep load stable.