Mitsubishi Electric FR-D700 Series, Инструкция по эксплуатации

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249
5
TROUBLES
HOOTING
Causes and corrective actions
(3) Alarm
When an alarm occurs, the output is not shut off. You can also output an alarm signal by making parameter setting.
(Set "98" in
Pr. 190 or Pr. 192 (output terminal function selection) . Refer to page 114 ).
(4) Fault
When a fault occurs, the inverter trips and a fault signal is output.
Operation panel
indication
FN
FR-PU04
FR-PU07
FN
Name Fan fault
Description
For the inverter that contains a cooling fan, appears on the operation panel when the cooling fan stops due to
an alarm or different operation from the setting of Pr. 244 Cooling fan operation selection .
Check point
Check the cooling fan for an alarm.
Corrective action
Check for fan alarm. Please contact your sales representative.
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 200% of the rated current during acceleration, the
protective circuit is activated and the inverter trips.
Check point
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/ground fault.
4. Check that stall prevention operation is appropriate.
5. 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
1. Increase the acceleration time. (Shorten the downward acceleration time in vertical lift application.
2. 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.
3. Check the wiring to make sure that output short circuit/ground fault does not occur.
4. Perform stall prevention operation appropriately.
(Refer to page 74).
5. Set base voltage (rated voltage of the motor, etc.) in Pr. 19 Base frequency voltage . (Refer to page 80)
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 200% of the rated current during constant speed
operation, the protective circuit is activated and the inverter trips.
Check point
1. Check for sudden load change.
2. Check for output short-circuit/ground fault.
3. Check that stall prevention operation is appropriate.
Corrective action
1. Keep load stable.
2. Check the wiring to make sure that output short circuit/ground fault does not occur.
3. Perform stall prevention operation appropriately.
(Refer to page 74).
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 200% of the rated inverter current during
deceleration (other than acceleration or constant speed), the protective circuit is activated and the inverter trips.
Check point
1. Check for sudden speed reduction.
2. Check for output short-circuit/ground fault.
3. Check for too fast operation of the motor's mechanical brake.
4. Check that stall prevention operation is appropriate.
Corrective action
1. Increase the deceleration time.
2. Check the wiring to make sure that output short circuit/ground fault does not occur.
3. Check the mechanical brake operation.
4. Perform stall prevention operation appropriately.
(Refer to page 74).