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6. Troubleshooting
6 - 30
Alarm No.
60
Instantaneous power failure
A drop in the 24VDC power was detected.
Investigation details Investigation results Remedies
CV CR
The voltage is not applied. Investigate item 3.
The voltage is 20.4VDC or less. Increase the power voltage.
The voltage drops below 20.4VDC
sometimes.
Investigate item 4.
1 Is 24VDC applied on the CN22
connector?
Is the voltage low, or does it drop
sometimes?
The voltage is correctly applied. Investigate item 2.
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The LEDs are not ON. Replace the unit. 2 Are the LEDs on the CR unit ON?
The LEDs are ON. Investigate item 4.
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The power is abnormal. Replace the power. 3 Check the wiring and power voltage.
The wiring or connectors are
abnormal.
Replace the cable.
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A voltage drop is not observed. Check the wiring. 4 Check whether the voltage is
dropping because of another load.
A voltage drop is observed. Increase the power capacity.
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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.
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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.
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The power capacity is insufficient. Increase the power capacity. 3 Check the power capacity.
The specified power capacity is
secured.
Investigate item 4.
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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.
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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.
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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.
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