Mitsubishi Electric MDS-E Series Instruction Manual page 438

MDS-E/EH Series Instruction Manual
7 Troubleshooting
Alarm No.
Power supply: Power module overcurrent
61
Overcurrent protection function in the power module of power supply has started its operation.
Investigation details
Check the state of the operation when the alarm
1
occurs, and check the repeatability.
2 Check the load state of all motors (during stopped).
Check the power capacity of the facility.
3 Check the capacity of the step-down transformer
(KVA).
Measure the voltage across wires.
4 Is the voltage 170V or more even when the motor is
accelerating?
Check whether there is any device (machine)
5
causing the power distortion.
Check if there is any abnormality in the unit's
6 ambient environment.
(Ex. Noise, grounding, etc.)
Alarm No.
Power supply: Frequency error
62
The input power supply frequency increased above the specification range.
Investigation details
Check the state of the operation when the alarm
1
occurs, and check the repeatability.
Measure the power voltage waveform during
2
normal operation.
Measure the power voltage when the motor is
3
accelerating/decelerating.
Check if there is any abnormality in the unit's
4 ambient environment.
(Ex. Noise, grounding, etc.)
Alarm No.
Power supply: Process error
66
An error occurred in the process cycle.
Investigation details
1 Check the repeatability.
Check if there is any abnormality in the unit's
2 ambient environment.
(Ex. Noise, grounding, etc.)
Alarm No.
Power supply: Phase interruption
67
An open-phase condition was detected in input power supply circuit.
Investigation details
1 Check the voltage for each input phase.
2 Check the alarm No. "71" items.
Investigation results
The alarm occurs immediately after 200VAC
is supplied or after READY is turned ON.
The alarm occurs occasionally during
READY ON.
The alarm occurs after continuous operation
for a long time.
The unit is hot.
The total load of all motors exceeds the rated
capacity of the power supply unit.
The total does not exceed the capacity.
The power capacity of the facility is
insufficient.
The specified power capacity is secured.
The voltage drops to 170V or less
occasionally.
The difference of the voltage across wires is
10V or more.
The difference of the voltage across wires is
less than 10V.
Abnormal noise is heard from an AC reactor
when stopping at the servo ON.
Abnormal noise is not heard.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
The alarm occurs each time immediately
after the power is turned ON. Or, the alarm
occurs occasionally regardless of the
operation state.
The alarm occurs only while the motor is
accelerating/decelerating.
The frequency is deviated from 50Hz±3% or
60Hz±3%.
The voltage waveform dips at some sections.
There is no problem.
The frequency greatly fluctuates during
acceleration/deceleration.
The voltage waveform during deceleration
dips in some sections.
There is no problem.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
The alarm occurs each time after the power
is turned ON.
The alarm occurs occasionally.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
There are phases with no voltage.
There is no problem.
407
Remedies
Replace the unit.
Check the investigation item No. 3.
Check the investigation item No. 2.
Lower the motor load and operation
frequency.
Check the investigation item No. 3.
Increase the power capacity of the facility.
Check the investigation item No. 4.
Increase the power capacity of the facility.
Improve the power phase balance.
Check the investigation item No. 5.
Improve the source of the distortion.
For example, when abnormal noise is heard
from another machine that is in operation,
move the wiring to the power which is far
from the machine's power supply.
Check the investigation item No. 6.
Remedies
Check the investigation item No. 2.
Check the investigation item No. 3.
Review the power facilities.
Improve the source of the distortion.
Install an AC reactor.
Check the investigation item No. 4.
Review the power facilities.
Improve the source of the distortion.
Install an AC reactor.
Check the investigation item No. 4.
Remedies
Replace the unit.
Check the investigation item No. 2.
Remedies
Correct the power supply.
Check the investigation item No. 2.
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IB-1501229-F