Specifications

8
8. TROUBLESHOOTING
8– 9
CN1B-
19 pin
Display
CN1A-
18 pin
CN1A-
19 pin
Name Definition ActionCause
Alarm Code
A. 31 1 0 1 Overspeed Speed has
exceeded the
instantaneous
permissible
speed.
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 the
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.
5. Encoder faulty. Change the
servo motor.
A. 32 1 0 0 Overcurrent Current that flew
is higher than
the permissible
current of the
servo amplifier.
1. Short occurred in servo amplifier
output phases U, V and W.
Correct the wiring.
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.
Change the servo
amplifier.
3. Ground fault occurred in servo
amplifier output phases U, V and W.
Correct the wiring.
4. External noise caused the overcurrent
detection circuit to misoperate.
Take noise suppression
measures.
A. 33 0 0 1 Overvoltage Converter bus
voltage exceeded
400V.
1. Lead of built-in regenerative
brake resistor or regenerative
brake option is open or
disconnected.
1. Change lead.
2. Connect
correctly.
2. Regenerative transistor faulty. Change servo
amplifier.
3. Wire breakage of built-in
regenerative brake resistor or
regenerative brake option
1. For wire breakage of
built-in regenerative
brake resistor,
change servo
amplifier.
2. For wire breakage of
regenerative brake
option, change
regenerative brake
option.
Add regenerative
brake option or
increase capacity.
4. Capacity of built-in regenerative
brake resistor or regenerative
brake option is insufficient.