146
Causes and corrective actions
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 220% of the rated inverter current during
deceleration (other than acceleration or constant speed), the protective circuit is activated to stop the inverter
output.
Check point
1. Check for sudden speed reduction.
2. Check for output short circuit.
3. Check for too fast operation of the motor's mechanical brake.
4. Check that stall prevention operation setting is correct.
5. Check that the power supply for RS-485 terminal is not shorted. (under vector control)
6. Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to
forward) during torque control under real sensorless vector control.
Corrective action
1. Increase the deceleration time.
2. Check the wiring to make sure that output short circuit does not occur.
3. Check the mechanical brake operation.
4. Check that stall prevention operation setting is correct.
(Refer to chapter 4 of
the
instruction
manual
(applied).)
5. Check RS-485 terminal connection. (under vector control)
6. Prevent the motor from switching the rotation direction from forward to reverse (or from reverse to
forward) during torque control under real sensorless vector control.
Operation Panel
Indication
E.OV1
FR-PU04
FR-PU07
OV During Acc
Name
Regenerative overvoltage trip during acceleration
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be
activated by a surge voltage produced in the power supply system. Protective circuit may activate even
if the regeneration converter is not activated due to power supply failure (Input phase failure and
instantaneous power failure).
Check point
1. Check for power supply fault or wrong wiring.
2. Check for too slow acceleration. (e.g. during descending acceleration in vertical lift load)
3. Check that the
Pr. 22 Stall prevention operation level
is not lower than the no load current.
Corrective action
1. Perform wiring correctly.
2. · Decrease the acceleration time.
· Use regeneration avoidance function
(Pr. 882 to Pr. 886)
.
(Refer to chapter 4 of
the instruction
manual (applied).)
3. Set a value larger than the no load current in
Pr. 22 Stall prevention operation level
.
Operation Panel
Indication
E.OV2
FR-PU04
FR-PU07
Stedy Spd OV
Name
Regenerative overvoltage trip during constant speed
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be
activated by a surge voltage produced in the power supply system. Protective circuit may activate even
if the regeneration converter is not activated due to power supply failure (Input phase failure and
instantaneous power failure).
Check point
· Check for power supply fault or wrong wiring.
· Check for sudden load change.
· Check that the
Pr. 22 Stall prevention operation level
is not lower than the no load current.
Corrective action
· Perform wiring correctly.
· Keep load stable.
· Use regeneration avoidance function
(Pr. 882 to Pr. 886)
.
(Refer to chapter 4 of
the
instruction
manual (applied).)
· Set a value larger than the no load current in
Pr. 22 Stall prevention operation level
.
Содержание FR-A741-11K
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