Mitsubishi Electric MR-J2M-P8B Instruction Manual page 130

9. TROUBLESHOOTING
Display
Name
IFU DRU
@A.31# Overspeed
@A.32# Overcurrent
FA.33 Overvoltage
FA.34 CRC error
@A.35# Command
frequency error
FA.36 Transfer error
Definition
Speed has exceeded 1. Small acceleration/deceleration time
the instantaneous constant caused overshoot to be
permissible speed. large.
2. Servo system is instable to cause
overshoot.
3. Encoder faulty.
Current that flew is 1. Short occurred in drive unit output
higher than the U, V and W.
permissible current of
2. Transistor of the servo drive unit
the drive unit.
faulty.
Alarm (A.32) occurs if power is
switched on after disconnection of
the U, V, W power cables.
3. Ground fault occurred in servo
amplifier output U, V and W.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Converter bus voltage 1. Regenerative brake option is not
exceeded 400VDC. used.
2. Though the regenerative brake
option is used, the DRU parameter
No. 2 setting is "
3. Regenerative brake option is open or
disconnected.
4. Regenerative transistor faulty.
5. Wire breakage of regenerative brake
option.
6. Power supply voltage high.
Bus cable is faulty. 1. Bus cable disconnected.
2. Bus cable fault.
3. Noise entered bus cable.
4. Termination connector disconnected. Connect termination connector.
5. The same No. exists in the interface
unit side axis setting.
Input frequency of 1. Command given is greater than the
command pulse is too maximum speed of the servo motor.
high.
2. Noise entered bus cable.
3. Servo system controller failure.
Bus cable or printed 1. Bus cable is disconnected.
board is faulty.
2. Bus cable fault.
3. Printed board is faulty.
4. Termination connector disconnected Connect termination connector.
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Cause
Checking method
00 (not used)".
9 - 6
Action
Increase acceleration/
deceleration time constant.
1. Reset servo gain to proper
value.
2. If servo gain cannot be set to
proper value:
1) Reduce load inertia moment
ratio; or
2) Reexamine acceleration/
deceleration time constant.
Change the servo motor.
Correct the wiring.
Change the drive unit.
Correct the wiring.
Take noise suppression
measures.
Use the regenerative brake
option.
Make correct setting.
1. Change lead.
2. Connect correctly.
Change drive unit.
For wire breakage of regenerative
brake option, change regenerative
brake option.
Review the power supply.
Connect correctly.
Change the cable.
Take measures against noise.
Set correctly.
Review operation program.
Take action against noise.
Change the servo system
controller.
Connect the connector of the bus
cable.
Change the cable.
Change the interface unit