Mitsubishi Electric EZMOTION MR-E Super MR-E-10A-QW003 Instruction Manual page 159

10. TROUBLESHOOTING
Display
AL.31 Overspeed
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AL.32 Overcurrent
AL.33 Overvoltage
Name Definition
Speed has
exceeded the
instantaneous
permissible speed.
Current that flew is
higher than the
permissible current
of the servo
amplifier. (When the
alarm (AL.32)
occurs, switch the
power OFF and then
ON to reset the
alarm. Then, turn on
the servo-on. When
the alarm (AL.32)
still occurs at the
time, the transistor
(IPM
IGBT) of the servo
amplifier may be at
fault. Do not switch
the power OFF/ON
repeatedly; check
the transistor
according to the
cause 2 checking
method.)
Converter bus
voltage exceeded
400VDC.
Cause
1. Input command pulse frequency
exceeded the permissible
instantaneous speed frequency.
2. Small acceleration/deceleration time
constant caused overshoot to be
large.
3. Servo system is instable to cause
overshoot.
4. Electronic gear ratio is large
(parameters No.3, 4)
5. Encoder faulty.
1. Short occurred in servo amplifier
output phases U, V and W.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (AL.32) occurs if power is
switched on after U,V and W
are disconnected.
3. Ground fault occurred in servo
amplifier output phases U, V and W.
4. External noise caused the
overcurrent detection circuit to
misoperate.
1. Regenerative option is not used.
2. Though the regenerative option is
used, the parameter No.0 setting is
" 0 (not used)".
3. Lead of built-in regenerative resistor
or regenerative option is open or
disconnected.
4. Regenerative transistor faulty.
5. Wire breakage of built-in
regenerative resistor or regenerative
option
6. Capacity of built-in regenerative
resistor or regenerative option is
insufficient.
7. Power supply voltage high.
10 - 8
Action
Set command pulses correctly.
Increase acceleration/deceleration time
constant.
1. Re-set 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.
Set correctly.
Change the servo motor.
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.
Use the regenerative option.
Make correct setting.
1. Change the lead.
2. Connect correctly.
Change the servo amplifier.
1. For wire breakage of built-in regenerative
resistor, change the servo amplifier.
2. For wire breakage of regenerative option,
change the regenerative option.
Add regenerative option or increase
capacity.
Check the power supply.