10.1 Troubleshooting
10-13
10
Inspection, Maintenance, and
T
roubleshooting
A.Cb
Encoder Echo-
back Error
Occurred when the
control power sup-
ply was turned ON
or during normal
operation.
The encoder wiring and contact are incorrect.
Correct the encoder wiring.
Encoder cable specifications is incorrect.
Use the recommended cable for the encoder cable.
The wiring distance for the encoder cable is too
long.
The wiring distance must be 20m max.
Noise interference occurred on the signal line,
because the encoder cable is bent and the sheath is
damaged.
Correct the encoder cable layout.
The encoder cable is bundled with a power line or
near a high-current line.
Separate the encoder cable from the power line.
The FG electrical potential varies because of the
influence from such machines on the servomotor
side as welders.
Ground the machine separately from PG side FG.
Noise interference occurred on the signal line from
the encoder.
Take measures against noise for the encoder wir-
ing.
An encoder fault occurred.
Replace the servomotor.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
A.CC
Multiturn Limit
Disagreement
Occurred when the
control power sup-
ply was turned ON.
The parameter settings for the SERVOPACK are
incorrect.
Correct the setting of Pn205 (0 to 65535).
The multiturn limit value for the encoder is not set or
was changed.
Execute Fn013 at the occurrence of alarm.
Occurred during
normal operation.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
A.d0
Position Error
Pulse Overflow
Occurred when the
control power sup-
ply was turned ON.
The overflow level (Pn505) is incorrect.
Make the value set in the Pn505 to other than 0.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Occurred at the ser-
vomotor high-speed
rotation.
The contact in the servomotor U, V, and W wirings
is faulty.
Correct the servomotor wiring.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
The servomotor did
not run with posi-
tion reference input.
Wirings of the servomotor U, V, and W are incorrect.
Correct the servomotor wiring.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Normal movement,
but occurred with a
long distance refer-
ence input.
The SERVOPACK gain adjustment is improper.
Increase the speed loop gain (Pn100) and position
loop gain (Pn102).
The position reference pulse frequency is too high.
Adjust slowly the position reference pulse fre-
quency.
Apply the smoothing function.
Correct the electronic gear ratio.
Setting of the position error pulse overflow alarm
level (Pn505) is incorrect.
Set the parameter Pn505 to proper value.
The load exceeds the rated load.
Reconsider and correct the load/operation condi-
tions and servomotor capacity.
A.F1
Power Line
Open Phase
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Occurred when the
main circuit power
supply was turned
ON.
The three-phase power supply wiring is incorrect.
Correct the power supply wiring.
The three-phase power supply is unbalanced.
Check the power supply voltage.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Occurred during
normal operation.
The contact in three-phase power supply wiring is
faulty.
Correct the power supply wiring.
Three-phase power supply is unbalanced.
Check the power supply voltage.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
A.F4
Main Circuit MC
Error
Occurred when the
control/main circuit
power supply was
turned ON.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Occurred when
servo was ON.
Incorrect wiring of control power supply input ter-
minals 380 to 480 VAC (only for 400V models)
Correct the power supply wiring.
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Occurred during
normal operation
A SERVOPACK fault occurred.
Replace the SERVOPACK.
Table 10.5 Alarm Display and Troubleshooting (cont’d)
Alarm
Display
Alarm Name
Situation at Alarm
Occurrence
Cause
Corrective Actions
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