6. Troubleshooting
6 - 30
Alarm No.
61
Power module overcurrent
The power module's overcurrent protection function activated.
Investigation details Investigation results Remedies
CV CR
The alarm occurs immediately after
200VAC is supplied and after READY
is turned ON.
Replace the unit.
The alarm occurs frequently during
READY ON.
Investigate item 3.
1 Check the state of the operation
when the alarm occurs, and check
the repeatability.
The alarm occurs after continuous
operation for a long time.
The unit is hot.
Investigate item 2.
{
The total load of all motors exceeds
the rated capacity of the power
supply unit.
Lower the motor load and operation
frequency.
2 Check the load state of all motors,
and the starting/stopping frequency.
The total does not exceed the
capacity.
Investigate item 3.
{
The power capacity is insufficient. Increase the power capacity. 3 Check the power capacity.
The specified power capacity is
secured.
Investigate item 4.
{
The voltage drops to 170V or less
occasionally.
Increase the power capacity.
The difference of the voltage across
wires is 10V or more.
Improve the power phase balance.
4 Measure the voltage across wires.
• Is the voltage 170V or more even
when the motor is accelerating?
The difference of the voltage across
wires is less than 10V.
Investigate item 5.
{
The power voltage is distorted. Improve the source of the distortion.
Install an AC reactor.
5 Measure the power voltage with a
synchroscope, and check whether
there is any distortion.
• Are there any other devices
causing the power distortion?
The power voltage waveform is not
abnormal.
Investigate item 6.
{
No abnormality is found in particular. Replace the unit. 6 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.
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.
{
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.
{
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.
{
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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