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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…

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Part 5 Chapter 1 Servo System Troubleshooting
Edition 3.0 5-1-17 XP-142E Mechanical Reference
AC Servopack Check List for Troubleshooting
Alarm Alarm Name Status Cause Remedy
A.300 Regeneration
Error Detected
• Occurred when the control
power supply was turned
ON.
• A SERVOPACK board fault occurred. • Replace the SERVOPACK.
• Occurred when the main
circuit power supply turned
ON.
• Pn600 is set to a value other than "0" for a
servomotor of 400 W or less, and an external
regenerative resistor is not connected.
• Check for incorrect wiring or a disconnected
wire in the regenerative resistor.
• A SERVOPACK fault occurred, such as
regenerative transistor or a voltage sensor fault.
• Connect an external regenerative resistor, or set
Pn600 to "0" if an external regenerative resistor is
not connected.
• Correct the wiring for the external regenerative
resistor.
• Replace the SERVOPACK.
• Occurred during normal
operation
• Check for incorrect wiring and disconnection of
the regenerative resistor.
• The jumper between B2 and B3 is removed for
a servomotor of 500 W or more.
• The regenerative resistor is disconnected, so
the regenerative energy became excessive.
• A SERVOPACK fault, such as regenerative
transistor and voltage sensor fault, occurred.
• Correct the wiring for the external regenerative
resistor.
• Correct the wiring.
• Replace the regenerative resistor or replace the
SERVOPACK. Reconsider the load and operation
conditions.
• Replace the SERVOPACK.
A.320 Regenerative
Overload
• 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
tuned ON.
• The power supply voltage is 270V or more. • Correct the input voltage.
• Occurred during normal
operation
(large increase of
regenerative resistor
temperature)
• Occurred during normal
operation
(small increase of
regenerative resistor
temperature )
• Occurred at servo motor
deceleration
• The regenerative energy is excessive.
• The regenerating state continued.
• The setting of parameter Pn600 is smaller than
the external regenerative resistor's capacity.
• A SERVOFACK fault occurred.
• The regenerative energy is excessive.
• Select a proper regenerative resistance capacity,
or reconsider the load and operation conditions.
• Correct the set value of parameter Pn600.
• Replace the SERVOPACK.
• Select a proper regenerative resistance capacity,
or reconsider the load and operation conditions.
A.330 Main Circuit
Wiring Error
• 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
tuned ON.
• In the DC power input mode, AC power is
supplied through L1 and L2 or L1, L2, and L3.
• In the AC power input mode, DC power is
supplied through B1/(+) and (-) terminals.
• Pn600 is set to 0 if the regenerative resistance
is disconnected.
• For AC power input, Pn001.2=0.
• For DC power input, Pn001.2=1.
• Set Pn600 to 0.
NP1MT014E
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