Specifications

8. TROUBLESHOOTING
8– 12
CN1B-
19 pin
Display
A. 52
CN1A-
18 pin
CN1A-
19 pin
101
Name Definition ActionCause
Error
excessive
Droop pulse value
of the deviation
counter exceeded
80k pulses.
Increase the acceleration/
deceleration time constant.
1. Acceleration/deceleration time
constant is too small.
Alarm Code
Increase the
torque limit value.
2. Torque limit value (parameter
No. 28) is too small.
1. Review the
power supply
capacity.
2. Use servo motor
that provides larger
output.
3. Start not allowed because of
torque shortage due to power
supply voltage drop.
Increase set value
and adjust to ensure
proper operation.
4. Position control gain 1
(parameter No. 6) value is small.
1. When torque is
limited, increase
the limit value.
2. Reduce load.
3. Use servo
motor that pro-
vides larger
output.
5. Servo motor shaft was rotated
by external force.
1. Review opera-
tion pattern.
2. Install limit
switches.
6. Machine struck something.
Change the servo
motor.
7. Encoder faulty.
Connect correctly. 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.
A. 8E 000RS-232C
alarm
Communication
fault occurred
between servo
amplifier and
personal com-
puter.
Connect correctly. 1. Communication connector is disconnected.
Repair or change
cable.
2. Communication cable faulty.
(Wire breakage or short)
Change personal
computer.
3. Personal computer faulty.
Change servo
amplifier.
Fault of parts in servo amplifier8888 0 0 0 Watchdog CPU, parts faulty
Checking method
Alarm (8888) occurs if power is
switched on after CN1A, CN1B,
and CN3 connectors are
disconnected.