Mitsubishi Electric FR-E710W-0.1K, Инструкция по эксплуатации

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296
Causes and corrective actions
(4) Fault
When a fault occurs, the inverter trips and a fault signal is output.
Operation panel
indication
E.OC1
FR-PU04
FR-PU07
OC During Acc
Name
Overcurrent trip during acceleration
Description
When the inverter output current reaches or exceeds approximately 230% of the rated current during acceleration, the
protective circuit is activated and the inverter trips.
Check point
Check for sudden acceleration.
Check that the downward acceleration time is not long for lifts.
Check for output short-circuit/ground fault.
Check that the
Pr. 3 Base frequency setting is not 60Hz when the motor rated frequency is 50Hz.
Check if the stall prevention operation level is set too high.
Check if the fast-response current limit operation is disabled.
Check that regeneration is not performed frequently. (Check that the output voltage becomes larger than the V/F
reference value at regeneration and overcurrent occurs due to the high voltage.)
Corrective action
Increase the acceleration time. (Shorten the downward acceleration time for lifts.
When "E.OC1" is always lit at starting, disconnect the motor once and start the inverter.
If "E.OC1" is still lit, contact your sales representative.
Check the wiring to make sure that output short circuit/ground fault does not occur.
Set 50Hz in
Pr. 3 Base frequency . (Refer to page 98)
Lower the setting of stall prevention operation level.
Activate the fast-response current limit operation.
(Refer to page 92)
Set base voltage (rated voltage of the motor, etc.) in
Pr. 19 Base frequency voltage
.
(Refer to page 98)
Operation panel
indication
E.OC2
FR-PU04
FR-PU07
Stedy Spd OC
Name
Overcurrent trip during constant speed
Description
When the inverter output current reaches or exceeds approximately 230% of the rated current during constant speed
operation, the protective circuit is activated and the inverter trips.
Check point
Check for sudden load change.
Check for output short-circuit/ground fault.
Check if the stall prevention operation level is set too high.
Check if the fast-response current limit operation is disabled.
Corrective action
Keep load stable.
Check the wiring to make sure that output short circuit/ground fault does not occur.
Lower the setting of stall prevention operation level.
Activate the fast-response current limit operation.
(Refer to page 92)
Operation panel
indication
E.OC3
FR-PU04
FR-PU07
OC During Dec
Name
Overcurrent trip during deceleration or stop
Description
When the inverter output current reaches or exceeds approximately 230% of the rated inverter current during
deceleration (other than acceleration or constant speed), the protective circuit is activated and the inverter trips.
Check point
Check for sudden speed reduction.
Check for output short-circuit/ground fault.
Check for too fast operation of the motor's mechanical brake.
Check if the stall prevention operation level is set too high.
Check if the fast-response current limit operation is disabled.
Corrective action
Increase the deceleration time.
Check the wiring to make sure that output short circuit/ground fault does not occur.
Check the mechanical brake operation.
Lower the setting of stall prevention operation level.
Activate the fast-response current limit operation.
(Refer to page 92)