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Part 5 Chapter 1 Servo System Troubleshooting Edition 3.0 5-1-19 XP-142E Mechanical Reference AC Servopack Check List for Troubleshooting Alarm Alarm Name Status Cause Remedy A.510 Overspeed • Occurred when the servomoto…

Part 5 Chapter 1 Servo System Troubleshooting

Edition 3.0 5-1-18 XP-142E Mechanical Reference

AC Servopack Check List for Troubleshooting

Alarm Alarm Name Status Cause Remedy

A.400 Overvoltage • Occurred when the control

power supply was turned

ON.

• A SERVOFACK board fault occurred. • Replace the SERVOPACK.

• Occurred when the main

circuit power supply was

tuned ON.

• Occurred during normal

operation.

• The AC power voltage is 290V or more.

• A SERVOPACK fault occurred.

• Check the AC power voltage (check if there is

no excessive voltage change.)

• The motor speed is high and load moment of

inertia is excessive, resulting in insufficient

regenerative capacity.

• A SERVOPACK fault occurred.

• The AC power voltage must be within the specified

range.

• Replace the SERVOPACK.

• The AC power voltage must be within the specified

range.

• Check the load moment of inertia and minus load

specifications. Reconsider the load and operation

conditions.

• Replace the SERVOPACK.

• Occurred at servo motor

deceleration.

• The motor speed is high, and the load moment

of inertia is excessive.

• Reconsider the load and operation conditions.

A.410 Undervoltage • Occurred when the control

power supply was turned

ON.

• A SERVOPACK board fault occurred. • Replace the SERVOPACK.

• Occurred when the main

circuit power supply was

turned ON.

• The AC power supply voltage is 120V or less.

• The fuse of the SERVOPACK is blown out.

• The inrush current limit resistor is disconnected,

and result in an abnormal power supply voltage

or in an overload of the inrush current limit

resistor.

• A SERVOPACK fault occurred.

• The AC power supply voltage must be within the

specified range.

• Replace the SERVOPACK.

• Replace the SERVOPACK. Check the power

supply voltage, and reduce the number of times

that the main circuit is turned ON or OFF.)

• Replace the SERVOPACK.

• Occurred during normal

operation.

• The AC power supply voltage was lowered, and

large voltage drop occurred.

• A temporary power failure occurred.

• The servomotor Cable is short-circuited.

• The servomotor is short-circuited.

• A SERVOPACK fault occurred.

• The AC power supply voltage must be within the

specified range.

• Clear and reset the alarm, and restart the operation.

• Repair or replace the servomotor cable.

• Replace the servomotor.

• Replace the SERVOPACK.

A.510 Overspeed

• Occurred when the control

power supply was turned

ON.

• A SERVOPACK board fault occurred. • Replace the SERVOPACK.

• Occurred when servo was

ON.

• The order of phases U, V, and W in the

servomotor wiring is incorrect.

• The encoder wiring is incorrect.

• Malfunction occurred due to noise interference

in the encoder wiring.

• A SERVOPACK fault occurred.

• Correct the servomotor wiring.

• Correct the encoder wiring.

• Take measures against noise for the encoder wiring.

• Replace the SERVOPACK.

NP1MT015E

Part 5 Chapter 1 Servo System Troubleshooting

Edition 3.0 5-1-19 XP-142E Mechanical Reference

AC Servopack Check List for Troubleshooting

Alarm Alarm Name Status Cause Remedy

A.510 Overspeed • Occurred when the

servomotor started running

or in a high speed run.

• The order of phases U, V, and W in the

servomotor wiring is incorrect.

• The encoder wiring is incorrect.

• Malfunction occurred due to noise interference

in the encoder wiring.

• The position or speed reference input is too

large.

• The setting of the reference input gain is

incorrect.

• A SERVOPACK board fault occurred.

• Correct the servomotor wiring.

• Correct the encoder wiring.

• Take measures against noise for the encoder

wiring.

• Reduce the reference value.

• Correct the reference input gain setting.

• Replace the SERVOPACK.

A.511 Dividing Pulse

Output Overspeed

• Occurred while the

servomotor was running.

• The output frequency of the dividing pulse

exceeds 1.6 MHz.

• Lower the setting of the PG dividing pulse (Pn212).

• Reduce the servomotor speed.

A.520 Vibration Alarm • Occurred while the

servomotor was running.

• Abnormal vibration was detected.

• The moment of inertia ratio (Pn103) is greater

than the actual value, or fluctuates excessively.

• Reduce the servomotor speed.

• Reduce the speed loop gain (Pn100).

• Change the moment of inertia ratio (Pn103)

to an appropriate value.

• Occurred when the

servomotor did not run by

the reference input.

• Occurred during normal

operation.

• The servomotor wiring is incorrect or the

connection is faulty.

• The encoder wiring is incorrect or the

connection is faulty.

• The starting torque exceeds the maximum

torque.

• A SERVOPACK fault occurred.

• The actual torque exceeds the rated torque or

the starting torque largely exceeds the rated

torque.

• A SERVOPACK fault occurred.

• Correct the servomotor wiring.

• Correct the encoder wiring.

• Reconsider the load and operation conditions, or

reconsider the servomotor capacity.

• Replace the SERVOPACK.

• Reconsider the load and operation conditions, or

reconsider the servomotor capacity.

• Replace the SERVOPACK.

A.710 Overload :

High Load

A.720 Overload :

Low Load

• Occurred when the control

power supply was tuned

ON.

• Occurred when the servo

was turned ON.

• A SERVOPACK board fault occurred.

• The servomotor wiring is incorrect or the

connection is faulty.

• The encoder wiring is incorrect or the

connection is faulty.

• A SERVOPACK fault occurred.

• Replace the SERVOPACK.

• Correct the servomotor wiring.

• Correct the encoder wiring.

• Replace the SERVOPACK.

NP1MT016E

Part 5 Chapter 1 Servo System Troubleshooting

Edition 3.0 5-1-20 XP-142E Mechanical Reference

AC Servopack Check List for Troubleshooting

Alarm Alarm Name Status Cause Remedy

A.730 Dynamic Brake

Overload

• Occurred when the control

power supply was turned

ON.

• Occurred when the

servomotor was running

and in a status other than

servo OFF.

• Occurred when the

servomotor was running in

servo OFF status.

• A SERVOPACK board fault occurred.

• The rotating energy at a DB stop exceeds the

DB resistance capacity.

• A SERVOPACK fault occurred. .

• Replace the SERVOPACK.

• 1.Reduce the motor speed,

2.Reduce the load moment of inertia, or

3.Reduce the number of times of the DB stop

operation.

• Replace the SERVOPACK.

A.740 Overload of Surge

Current Limit

Resistor

• Occurred when the control

power supply was turned

ON.

• Occurred during operations

other than the turning

ON/OFF of the main circuit.

• Occurred at the main circuit

power supply ON/OFF

Operation.

• A SERVOPACK board fault occurred.

• The inrush current limit resistor operation

frequency at the main circuit power supply

ON/OF operation exceeds the allowable range.

• A SERVOPACK fault occurred.

• Replace the SERVOPACK.

• Reduce the number of times that main circuit's

power supply can be turned ON/OFF to 5 times/min.

or less.

• Replace the SERVOPACK.

NP1MT017E

A.7A0 Heat Sink

Overheated

• Occurred when the control

power supply was turned

ON.

• Occurred when the main

circuit power supply was

turned ON or while the

servomotor was running.

• A SERVOPACK fault occurred.

• The overload alarm has been reset by turning

OFF the power too many times.

• The load exceeds the rated load.

• The SERVOPACK ambient temperature

exceeds 55°C.

• A SERVOFACK fault occurred.

• The overload alarm has been reset by turning

OFF the power too many times.

• The connection of the SERVOPACK board and

the thermostat switch is incorrect.

• The overload or regenerative energy exceeds

the resistor capacity

• The SERVOPACK (direction and distance to

the peripheral devices) is mounted incorrectly.

Heat radiation from the panel or heat around

the SERVOPACK.

• A SBRVOPACK fan fault occurred.

• Replace the SERVOPACK.

• Change the method to reset the alarm.

• Reconsider the load and operation conditions, or

reconsider the servomotor capacity.

• The ambient temperature must be 55°C or less.

• Replace the SERVOPACK.

• Change the method to reset the alarm.

• Replace the SERVOPACK.

• Reconsider the load and operation conditions.

• The ambient temperature for SERVOPACK must be

55°C or less.

• Replace the SERVOPACK.