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8. TROUBLESHOOTING
Alarm Code
Display
CN1B-
CN1A-
CN1A-
19 pin
18 pin
19 pin
A. 52
1
0
A. 8E
0
0
8888
0
0
Name
Definition
1
Error
Droop pulse value
excessive
of the deviation
counter exceeded
80k pulses.
0
RS-232C
Communication
alarm
fault occurred
between servo
amplifier and
personal com-
puter.
0
Watchdog
CPU, parts faulty
Cause
1. Acceleration/deceleration time
constant is too small.
2. Torque limit value (parameter
No. 28) is too small.
3. Start not allowed because of
torque shortage due to power
supply voltage drop.
4. Position control gain 1
(parameter No. 6) value is small.
5. Servo motor shaft was rotated
by external force.
6. Machine struck something.
7. Encoder faulty.
8. Wrong connection of servo motor.
Servo amplifier's output terminals
U, V, W do not match servo mo-
tor's input terminals U, V, W.
1. Communication connector is disconnected.
2. Communication cable faulty.
(Wire breakage or short)
3. Personal computer faulty.
Fault of parts in servo amplifier
Checking method
Alarm (8888) occurs if power is
switched on after CN1A, CN1B,
and CN3 connectors are
disconnected.
8– 12
Action
Increase the acceleration/
deceleration time constant.
Increase the
torque limit value.
1. Review the
power supply
capacity.
2. Use servo motor
that provides larger
output.
Increase set value
and adjust to ensure
proper operation.
1. When torque is
limited, increase
the limit value.
2. Reduce load.
3. Use servo
motor that pro-
vides larger
output.
1. Review opera-
tion pattern.
2. Install limit
switches.
Change the servo
motor.
Connect correctly.
Connect correctly.
Repair or change
cable.
Change personal
computer.
Change servo
amplifier.
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