YASKAWA UAK series User Manual

11 Inspection, Maintenance, and Troubleshooting
11.2.3 Troubleshooting of the Servo Drive Alarms
11-18
A.40C:
Abnormal Voltage in
Converter Main Circuit
(An error occurred in the
main circuit of the power
regeneration converter.)
The AC voltage is unstable.
Measure the AC power supply volt-
age.
Improve the power supply condi-
tions.
The DC bus voltage is unstable,
or an error occurred in the main
circuit in the SERVOPACK.
Measure the DC bus power supply
voltage.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The DC bus voltage is unstable,
or an error occurred in the main
circuit in the power regeneration
converter.
Measure the DC bus power supply
voltage.
The power regeneration converter
may be faulty. Replace the power
regeneration converter.
An error occurred in the AC/DC
voltage detection circuit in the
power regeneration converter.
−
The power regeneration converter
may be faulty. Replace the power
regeneration converter.
A.410:
Undervoltage
(The DC-bus voltage
inside the SERVO-
PAC K i s low.)
•For 200-VAC SERVOPACKs:
The power supply voltage was
in the range between 125 V and
170 V.
•For 400-VAC SERVOPACKs:
The power supply voltage was
in the range between 250 V and
323 V.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
The power supply voltage
dropped during operation.
Measure the power supply voltage. Increase the power supply capacity.
Occurrence of instantaneous
power interruption.
Measure the power supply voltage.
Improve the power supply condi-
tions.
SERVOPACK failure −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.41A:
Converter DC
Undervoltage
(The DC-bus voltage
inside the power regen-
eration converter is low.)
•For 200-VAC power regenera-
tion converter:
The power supply voltage was
in the range between 125 V and
170 V.
•For 400-VAC power regenera-
tion converter:
The power supply voltage was
in the range between 250 V and
323 V.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
The wiring of the main circuit DC
bus is incorrect.
Check the wiring.
Correct the wiring of the main cir-
cuit DC bus.
An error occurred in the main cir-
cuit of the SERVOPACK con-
nected to the converter.
Separate the main circuit DC bus of
the SERVOPACK.
Separate the SERVOPACK and
then turn ON the power supply
again. If an alarm does not occur,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
Power regeneration converter
failure
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the power regeneration con-
verter may be faulty. Replace the
power regeneration converter.
(cont’d)
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions

YASKAWA UAK series Specifications

General

Brand	YASKAWA
Model	UAK series
Category	Servo Drives
Language	English