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VFD68 Variable Frequency Drives
65
Table 53: Overcurrent Trip During Constant Speed
Operation
Panel
Indication
E.OC2
Description
When the VFD output current reaches or exceeds approximately 200% of the rated current during
constant speed operation, the protective circuit is activated and the VFD 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.
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.
Table 54: Overcurrent Trip During Deceleration or Stop
Operation
Panel
Indication
E.OC3
Description
When the VFD output current reaches or exceeds approximately 200% of the rated VFD current
during deceleration (other than acceleration or constant speed), the protective circuit is activated and
the VFD 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.
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.
Table 55: Regenerative Overvoltage Trip During Acceleration
Operation
Panel
Indication
E.OV1
Description
If regenerative energy causes the VFD's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated and the VFD trips. The circuit may also be activated
by a surge voltage produced in the power supply system.
Check Point
Check that the setting of P. 22 is not too small.
Corrective
Action
Set P. 22 correctly.
Table 56: Regenerative Overvoltage Trip During Constant Speed
Operation
Panel
Indication
E.OV2
Description
If regenerative energy causes the VFD's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the VFD output. The circuit may also be
activated by a surge voltage produced in the power supply system.
Check Point
Check that the setting of P. 22
is not too small.
Corrective
Action
Set P. 22 correctly.