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Part 5 Chapter 1 Servo System Troubleshooting Edition 3.0 5-1-23 XP-142E Mechanical Reference AC Servopack Check List for Troubleshooting Alarm Alarm Name Status Cause Remedy A.bF0 System Alarm 0 • Occurred when the cont…

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Part 5 Chapter 1 Servo System Troubleshooting
Edition 3.0 5-1-22 XP-142E Mechanical Reference
AC Servopack Check List for Troubleshooting
Alarm Alarm Name Status Cause Remedy
A.850 Encoder
Overspeed
• Occurred when the control
power supply was turned
ON.
• Occurred during operation.
• When the encoder power supply turns ON
and the SEN signal is ON when using an
absolute encoder, the servomotor runs at
200 min or more.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• Turn ON the encoder power supply when the
servomotor runs at a speed less than 200 min .
• If this alarm occurs frequently, replace the
servomotor.
• Replace the SERVOPACK.
• Replace the servomotor.
• Replace the SERVOPACK.
-1
-1
A.860 Encoder
Overheated
• Occurred when the control
power supply was turned
ON.
• Occurred during operation.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• The ambient temperature around the
servomotor is too high.
• The servomotor load is greater than the rated
load.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• Replace the servomotor.
• Replace the SERVOPACK.
• The ambient temperature must be 40°C or less.
• The servomotor load must be within the specified
range.
• Replace the servomotor.
• Replace the SERVOPACK.
NP1MT019E
A.b10 Speed Reference
A/D Data Error
• Occurred when the control
power supply was turned
ON.
• Occurred during operation.
• A SERVOFACK board fault occurred.
• A malfunction occurred in reading section of
the speed reference input.
• A SERVOFACK board fault occurred.
• Replace the SERVOPACK.
• Clear and reset the alarm and restart the
operation.
• Replace the SERVOPACK.
A.b20 Torque Reference
Input Read Error
• Occurred when the control
power supply was turned
ON or during operation.
• A SERVOFACK board fault occurred.
• A malfunction occurred in the reading section
of the torque reference input.
• A SERVOPACK board fault occurred.
• Replace the SERVOPACK.
• Clear and reset the alarm and restart the
operation.
• Replace the SERVOPACK.
A.b31 Current Detection
Error 1
• Occurred when the control
power supply was turned
ON or during operation.
• The current detection circuit for the Phase U
is faulty.
• Replace the SERVOPACK.
A.b32 Current Detection
Error 2
• Occurred when the control
power supply was turned
ON or during operation.
• The current detection circuit for the Phase U
is faulty.
• Replace the SERVOPACK.
A.b33 Current Detection
Error 3
• Occurred when the control
power supply was turned
ON or during operation.
• The detection circuit for the power supply is
faulty.
• The servomotor cable is disconnected.
• Replace the SERVOPACK.
• Check the motor wiring
Part 5 Chapter 1 Servo System Troubleshooting
Edition 3.0 5-1-23 XP-142E Mechanical Reference
AC Servopack Check List for Troubleshooting
Alarm Alarm Name Status Cause Remedy
A.bF0 System Alarm 0 • Occurred when the control
power supply was turned
ON.
• A SERVOPACK board fault occurred. • Replace the SERVOPACK.
A.bF1 System Alarm 1 • Occurred when the control
power supply was turned
ON.
• A SERVOPACK board fault occurred. • Replace the SERVOPACK.
A.bF2 System Alarm 2 • Occurred when the control
power supply was turned
ON.
• A SERVOPACK board fault occurred. • Replace the SERVOPACK.
A.bF3 System Alarm 3 • Occurred when the control
power supply was turned
ON.
• A SERVOPACK board fault occurred. • Replace the SERVOPACK.
A.bF4 System Alarm 4 • Occurred when the control
power supply was turned
ON.
• A SERVOPACK board fault occurred. • Replace the SERVOPACK.
NP1MT020E
22
A.C10 Servo Overrun
Detected
• Occurred when the control
power supply was turned
ON.
• Occurred when the servo
was ON or a reference
was input.
• A SERVOPACK board fault occurred.
• The order of phase-U, -V, and -W in the
servomotor wiring is incorrect.
• An encoder fault occurred.
• A SERVOPACK fault occurred.
• Replace the SERVOPACK.
• Correct the servomotor wiring.
• Replace the servomotor.
• Replace the SERVOPACK
A.C80
Absolute Encoder
Clear Error and
Multi-turn Limit
Setting Error
• Occurred when the control
power supply was turned
ON.
• Occurred when an
encoder alarm was
cleared and reset.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• Replace the servomotor.
• Replace the SERVOPACK.
• Replace the servomotor.
• Replace the SERVOPACK.
A.C90 Encoder
Communications
Error
• Occurred when the control
power supply was turned
ON or during operation.
• The encoder wiring and the contact are
incorrect.
• Noise interference occurred due to incorrect
encoder cable specification.
• Noise interference occurred because the
wiring distance for the encoder cable is too
long.
• Correct the encoder wiring.
• Use tinned annealed copper twisted-pair or
twisted-pair shielded wire with a core of at least
0.12 mm (0.0002 in ).
• The wiring distance must be 20 m (65.6 ft) max.
Part 5 Chapter 1 Servo System Troubleshooting
Edition 3.0 5-1-24 XP-142E Mechanical Reference
AC Servopack Check List for Troubleshooting
Alarm Alarm Name Status Cause Remedy
A.C91 Encoder
Communications
Position Data
Error
• Occurred when the control
power supply was turned
ON or during operation.
• The noise interference occurred on the signal
line because the encoder cable is bent and
the sheath is damaged.
• The encoder cable is bundled with a
high-current line or near a high-current line.
• The FG varies because of the influence from
machines on the servomotor side, such as
welder.
• Correct the encoder cable layout.
• Correct the encoder cable layout so that no surge
is applied.
• Make the grounding for the machine separately
from PG side FG.
A.C92 Encoder
Communications
Timer Error
• Occurred when the control
power supply was turned
ON or during operation.
• Noise interference occurred on the signal line
from the encoder.
• Excessive vibration and shocks were applied
to the encoder.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• Take a measure against noise for the encoder
wiring.
• Reduce the machine vibration or mount the
servomotor securely.
• Replace the servomotor.
• Replace the SERVOPACK.
A.CA0 Encoder
Parameter Error
• Occurred when the control
power supply was turned
ON.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• Replace the servomotor.
• Replace the SERVOPACK.
A.Cb0 Encoder
Echoback Error
• Occurred when the control
power supply was turned
ON or during operation.
• The encoder wiring and contact are incorrect.
• Noise interference occurred due to incorrect
encoder cable specifications.
• Noise interference occurred because the
wiring distance for the encoder cable is too
Iong.
• Noise interference occurred on the signal line,
because the encoder cable is bent and the
sheath is damaged.
• The encoder cable is bundled with a
high-current line or near a high-current line.
• The FG varies because of the influence from
the servomotor side machines, such as welder.
• Noise interference occurred on the signal line
from the encoder.
• Excessive vibration and shocks to the
encoder was applied.
• An encoder fault occurred.
• A SERVOPACK board fault occurred.
• Correct the encoder wiring.
• Use tinned annealed copper twisted-pair or
twisted-pair shielded wire with a core of at least
0.12 mm (0.002 in ).
• The wiring distance must be 20m (65.6 ft) max.
• Correct the encoder cable layout.
• Correct the encoder cable layout so that no surge
is applied.
• Ground the machine separately from PG side FG.
• Take measures against noise for the encoder
wiring.
• Reduce the machine vibration or mount the
servomotor securely.
• Replace the servomotor.
• Replace the SERVOPACK.
NP1MT021E
22