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9. TROUBLESHOOTING
Display Name Definition Cause Action
CPU/parts fault Faulty parts in the servo amplifier
Checking method
Alarm (A. 17) occurs if power is
switched on after connectors
CN1A, CN1B, CNP2, CNP3 are
disconnected.
Change the servo amplifier.A. 17 Board error 2
The output
terminals U, V, W of
the servo amplifier
and the input
terminals U, V, W of
the servo motor are
not connected.
2. The wiring of U, V, W is
disconnected or not connected.
Correctly connect the output terminals U,
V, W of the servo amplifier and the input
terminals U, V, W of the servo motor.
A. 18 Board error 3 Printed board fault
Checking method
Alarm (A. 18) occurs if power is
switched on after connectors
CN1A, CN1B, CNP2, CNP3 are
disconnected.
Change the servo amplifier.
1. Encoder connector (CN2) disconnected. Connect correctly.
2. Encoder cable faulty
(Encoder wiring breakage or
shorted)
Repair or change the cable.
A. 20 Encoder error 2 Communication
error occurred
between encoder
and servo amplifier.
3. Encoder fault Change the servo motor.
1. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
Change the cable.
A. 24 Motor outout
ground fault
Ground fault
occurred at the
servo motor outputs
(U,V and W phases)
of the servo
amplififer.
2. Main circuit of servo amplifier
failed.
Checking method
A.24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Change the servo amplifier.
1. Input command pulse frequency
exceeded the permissible
instantaneous speed frequency.
Set command pulses 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/
deceleration time constant.
4. Electronic gear ratio is large
(parameters No. 3, 4)
Set correctly.
A. 31 Overspeed Speed has exceeded
the instantaneous
permissible speed.
5. Encoder faulty. Change the servo motor.