Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 229

General-purpose ac servo, general purpose interface servo amplifier/motor
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8. TROUBLESHOOTING
Alarm No.: A.31
Name: Overspeed
Description
Detailed
Detailed
display
Name
31.1
Motor speed
1) Command speed is high.
error
2) Servo motor operates with
3) Servo system is unstable
4) The overshoot of speed
5) Encoder faulty.
Alarm No.: A.32
Name: Overcurrent
Description
Detailed
Detailed
display
Name
32.1
Overcurrent
1)
was
detected by
the hardware
detection
2) Ground fault or short of
circuit
(during
operation)
3) Servo motor fault
4) Fault in the surrounding
Servo motor speed has exceeded the instantaneous permissible speed.
Cause
the maximum torque, and
speed overshoot occurs.
and oscillating.
waveform occurs.
The flowed current is higher than the permissible current of the servo amplifier.
Cause
Servo amplifier fault
the servo motor power
cables
environment
Checking method
Check if the command
The command
speed is at the
speed is at the
permissible speed or
permissible speed
higher.
or higher.
The command
speed is lower than
the permissible
speed.
Check if the
Performed with the
acceleration torque is
maximum torque.
the maximum.
Performed with the
torque lower than
the maximum.
Check if the servo
Servo motor is
motor is oscillating.
oscillating.
Servo motor is not
oscillating.
Check if the overshoot
Overshoot occurs.
occurs due to saturated
torque caused by short
acceleration time
Overshoot does not
constant.
occur.
Check if the alarm
Alarm occurs.
occurs when the actual
speed is under the
instantaneous
permissible speed.
Checking method
Check if the alarm
Alarm occurs.
occurs even if the
power cables (U, V, W)
Alarm does not
are disconnected.
occur.
Check if the power
Cables are shorted.
cables themselves are
No problem.
shorted.
Remove the power
Ground fault occurs
cables from the servo
in the servo motor.
motor edge and check
Ground fault does
if short occurs
not occur in the
(between U, V, W and
servo motor.
).
Check the noise, etc.
An error is found.
8 - 12
Result
Action
Check the operation
pattern.
Check 2).
Increase the
acceleration/deceleration
time constant, or reduce
the load.
Check 3).
Adjust the servo gain by
the auto tuning 1 or the
one-touch tuning.
Reduce the load.
Increase the acceleration
time constant.
Check 4).
Increase the
acceleration/deceleration
time constant.
Check 5).
Replace the servo motor.
Result
Action
Replace the servo
amplifier.
Check 2).
Replace the power cables.
Check 3).
Replace the servo motor.
Check 4).
Take the appropriate
measures according to the
cause.

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