Mitsubishi Electric MDS-E Series Instruction Manual page 426

MDS-E/EH Series Instruction Manual
7 Troubleshooting
Overspeed
Alarm No.
The motor was detected to rotate at a speed exceeding the allowable speed (In the case of linear motor, it was detected to move
31
at a speed exceeding the allowable speed).
Investigation details
Check if the unit in which the alarm was detected is
1
servo or spindle.
Check the servo parameters SV001 (PC1), SV002
2
(PC2), SV018 (PIT) and SV025 (MTYP) settings.
3 Check the spindle parameter SP026 (TSP) setting.
4 Check the PLG output waveform.
Check whether the speed waveform is
5
overshooting.
6 Check the repeatability.
Alarm No.
Power module overcurrent
32
Overcurrent protection function in the power module has started its operation.
Investigation details
Disconnect the power cable (U, V, W) from the
unit's terminal block and motor, and check whether
1 a short-circuit between the power cable or whether
conduction at both end of wiring occurs with a
tester.
Check the motor insulation with a (megger) tester.
-Between motor power and ground earth
Check the unit capacity.
2
[1] The same size but smaller than the selected
capacity.
[2] The combination of the motor and axis is
alternated in a 2-axis unit.
3 Check the current loop gain parameters.
Jiggle the encoder connectors (drive unit side and
4
encoder side) and check if they are disconnected.
Turn the power OFF, and check the encoder cable
5
connection with a tester.
6 Check the repeatability.
Replace with another unit, and check whether the
7
fault is on the drive unit side or encoder side.
Check for any abnormalities in the unit's ambient
8 environment.
(Ex.: Ambient temperature, noise, grounding)
Investigation results
The alarm was detected in servo.
The alarm was detected in spindle.
The settings are incorrect.
Correctly set.
The setting is incorrect.
The alarm is detected at 115% of SP026.
Correctly set.
There is a problem.
Normal.
The waveform is overshooting.
The waveform is not overshooting.
[1] The alarm occurs when the motor is
stopped.
[2] The rotation speed displayed on the drive
monitor varies when the motor is stopped.
The alarm occurs at all time.
Investigation results
[1] Before disconnecting the power cable, the
cable connector or screw has been
loosened.
[2] The short-circuit condition persists even
after disconnecting the cable from the unit
and motor.
There is no problem.
Less than 1MΩ. (Grounding)
1MΩ or more. (Normal)
The capacity is small.
The smaller capacity side was used in 2-axis
unit.
The motor meets the selected capacity.
Different from the standard parameter
settings.
Equivalent to the standard parameter
settings.
The connector is disconnected (or loose).
The connector is not disconnected.
Connection is faulty.
Connection is normal.
The state returns to normal once, but occurs
sometimes thereafter.
The error is always repeated.
The alarm is on the drive unit side.
The alarm is on the encoder side.
Take remedies according to the causes of the abnormality in the ambient environment.
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Remedies
Check the investigation item No. 2.
Check the investigation item No. 3.
Correctly set.
Check the investigation item No. 5.
Correctly set.
Check the investigation item No. 4.
Adjust the PLG output waveform.
Check the investigation item No. 5.
Increase the acceleration/ deceleration time
constant.
Lower the load inertia.
Check if there is any abnormality in the unit's
ambient environment.
(Ex.: Ambient temperature, noise, grounding)
Check the investigation item No. 6.
Replace the encoder or encoder cable.
Replace the drive unit.
Remedies
[1] Tighten it.
[2] Check the motor wiring.
[3] Replace the power cable.
Check the investigation item No. 2.
Replace the motor.
Check the investigation item No. 3.
Replace to the unit of the selected capacity or
change the axis.
Check the investigation item No. 3.
Adjust the value to the standard setting.
Check the investigation item No. 4.
Correctly install.
Check the investigation item No. 5.
Replace the encoder cable.
Check the investigation item No. 6.
Check the investigation item No. 8.
Check the investigation item No. 7.
Replace the drive unit.
Replace the encoder.
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IB-1501229-F