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9. TROUBLESHOOTING
Display Name Definition Cause Action
(Note 2)
Alarm details
AL.31 Overspeed Speed has
exceeded the
instantaneous
permissible speed.
1. Input command pulse frequeroy is too
high.
Set command pulse
frequency correctly.
2. Small acceleration/deceleration time
constant caused overshoot to be large.
Increase acceleration/
deceleration time constant.
3. Servo system is instable to cause
overshoot.
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/decelerati
on time constant.
4. Electronic gear ratio is large.
(Setting by parameters No. PA06,
PA07)
Set correctly.
5. Encoder faulty. Change the servo motor.
AL.32 Overcurrent Current that flew is
higher than the
permissible
current of the
servo amplifier.
1. Short or ground fault occurs at a servo
motor power cable.
(A sheath of a servo motor power
cable deteriorated, resulting in short or
ground fault.)
<Checking method>
The servo motor power cables (U, V,
W) are disconnected on the servo
motor terminal side. After that, the
servo motor is turned on, and the
alarm (AL.32) occurs.
Repair the cable.
2. External dynamic brake fault
<Checking method>
The servo motor power cables (U, V,
W) are disconnected on the external
dynamic brake terminal side. After
that, the servo motor is turned on, and
the alarm (AL.32) does not occur.
1. Check parameters and
the dynamic brake
interlock.
2. Replace the external
dynamic brake.
3. Servo amplifier fault.
<Checking method>
The servo motor power cables (U, V,
W) are disconnected. After that, the
servo motor is turned on, and the
alarm (AL.32) occurs.
Change the servo amplifier.
4. Servo motor fault.
<Checking method>
The servo motor power cables (U, V,
W) are disconnected on the external
dynamic brake terminal side. After
that, the servo motor is turned on, and
the alarm (AL.32) does not occur.
Change the servo motor.
5. External noise caused erroneous
operation to the overcurrent detection
circuit.
<Checking method>
1. Check that the servo amplifier is not
influenced by noise of magnetic
valves, magnetic contactors or
relays.
2. Check the grounding of the servo
amplifier and the servo motor.
Ground correctly or take
noise reduction measures.
6. Encoder fault. Change the servo motor. 2