Mitsubishi Electric MELSERVO MR-J2-A Product Specifications And Installation Manual page 201

8. TROUBLESHOOTING
Alarm Code
Display
CN1B- CN1A- CN1A-
19 pin 18 pin 19 pin
A. 31 1 0 1
A. 32 1 0 0
A. 33 0 0 1
Name Definition
Overspeed Speed has
exceeded the
instantaneous
permissible
speed.
Overcurrent Current that flew
is higher than
the permissible
current of the
servo amplifier.
Overvoltage Converter bus
voltage exceeded
400V.
8– 9
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 (A. 32) occurs if power is
switched on after U,V and W
connectors 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. Lead of built-in regenerative
brake resistor or regenerative
brake option is open or
disconnected.
2. Regenerative transistor faulty.
3. Wire breakage of built-in
regenerative brake resistor or
regenerative brake option
4. Capacity of built-in regenerative
brake resistor or regenerative
brake option is insufficient.
Action
Set command
pulses correctly.
Increase the
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.
1. Change lead.
2. Connect
correctly.
Change servo
amplifier.
1. For wire breakage of
built-in regenerative
brake resistor,
change servo
amplifier.
2. For wire breakage of
regenerative brake
option, change
8
regenerative brake
option.
Add regenerative
brake option or
increase capacity.