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6. Troubleshooting
6 - 31
Alarm No.
62
Frequency error
The input power frequency exceeded the specified range.
Investigation details Investigation results Remedies
CV CR
The alarm occurs each time
immediately after the power is turned
ON. Or, the alarm occurs
occasionally regardless of the
operation state.
Investigate item 2.
1 Check the state of the operation
when the alarm occurs, and check
the repeatability.
The alarm occurs only while the
motor is accelerating/decelerating.
Investigate item 3.
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The frequency is deviated from
50Hz±3% or 60Hz±3%.
Review the power facilities.
The voltage waveform dips at some
sections.
Improve the source of the distortion.
Install an AC reactor.
2 Measure the power voltage waveform
during normal operation.
There is no problem. Investigate item 4.
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The frequency greatly fluctuates
during acceleration/deceleration.
Review the power facilities.
The voltage waveform during
deceleration dips in some sections.
Improve the source of the distortion.
Install an AC reactor.
3 Measure the power voltage when the
motor is accelerating/decelerating.
There is no problem. Investigate item 4.
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No abnormality is found in particular. Replace the unit. 4 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Noise, grounding)
The grounding is incomplete.
An alarm will occur easily if another
device operates.
Take remedies according to the
causes of the abnormality.
Ex. Incomplete grounding:
Additionally ground.
Noise: Noise measures for
other devices.
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Alarm No.
63
Auxiliary regeneration error
The auxiliary regenerative transistor is still ON.
Investigation details Investigation results Remedies
CV CR
Cutting oil or oil mist is adhered on
the regenerative resistor.
Take measure to prevent cutting oil
and dust from getting on the fins at
the back of the unit, and then carry
out investigation details 2.
1 Check whether the regenerative
resistor on the back of the unit is dirty.
The resistor is not dirty. Replace the unit.
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There is continuity. Replace the unit. 2 Using a tester, check the continuity of
the terminal block and resistor
surface.
The resistance value is ∞. Clean the resistor or fins.
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Alarm No.
65
Rush relay error
The rush resistance short-circuit relay does not turn ON.
Investigation details Investigation results Remedies
CV CR
The alarm occurs each time READY
is turned ON.
Replace the unit. 1 Check the repeatability.
The alarm occurs occasionally. Investigate item 2.
{
No abnormality is found in particular. Replace the unit. 2 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Noise, grounding)
The grounding is incomplete.
An alarm will occur easily if another
device operates.
Take remedies according to the
causes of the abnormality.
Ex. Incomplete grounding:
Additionally ground.
Noise: Noise measures for
other devices.
{
Alarm No.
67
Phase failure
There is a phase failure in the input power.
Investigation details Investigation results Remedies
CV CR
There are phases with no voltage. Correct the power supply. 1 Check the voltage for each input
phase.
There is no problem. Investigate item 2.
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2 Check the alarm No. "71" items.
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