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MDS-EX-CVP Series Specifications and Instruction Manual
10. Troubleshooting
10.2.2 List of Warnings
When a warning occurs, a warning No. will appear on the NC monitor screen and with the LEDs on the front of each
unit. Check the warning No., and remove the cause of the warning by following this list.
List of Warnings
No.
Instantaneous power interruption
E9
warning
In external emergency stop state
EA
Power supply: Overload warning
EC
Power supply: Fan stop warning
EE
Power supply: Option unit warning
EF
10.3 Troubleshooting
If the NC system does not start up correctly and a system error occurs when the NC power is turned ON, the drive unit
may not have been started up properly. Check the LED display on the power supply unit, and take measures according
to this section.
Power supply unit alarm
Alarm No.
61
Investigation details
Check the state of the operation when the alarm occurs,
1
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 380 V or more even when the motor is
accelerating?
Check whether there is any device (machine) causing
5
the power distortion.
Check if there is any abnormality in the unit's ambient
environment.
6
(Ex. Noise, grounding, etc.)
Name
The power was momentarily interrupted.
External emergency stop signal was input.
Overload detection level exceeded 80 %.
A cooling fan built in the power supply unit stopped.
A warning was detected in the power backup unit (power supply option
unit).
Power supply: Power module overcurrent
Overcurrent protection function in the power module of power supply has started its operation.
The alarm occurs immediately after 400 VAC 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 less than 380 V
occasionally.
The difference of the voltage across wires is
10 V or more.
The difference of the voltage across wires is
less than 10 V.
The power supply waveform is distorted when
measuring the input voltage waveform during
servo OFF.
The power supply waveform is not distorted.
Take remedies according to the causes of the abnormality in the ambient environment.
Details
Investigation results
39
Reset
method
NR
*
*
*
*
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 the power supply
waveform is distorted when another
machine is in operation, move the
wiring to the power which is far from the
machine's power supply.
Check the investigation item No. 6.
IB-1501587-A
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Table of Contents
Troubleshooting
