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11 Inspection, Maintenance, and Troubleshooting
11.2.3 Troubleshooting of the Servo Drive Alarms
11-16
A.400:
Overvoltage
(The DC-bus voltage
inside the SERVO-
PACK is abnormally
high.)
• For 200-VAC SERVOPACKs
with DC-bus power supply
input: The power supply volt-
age exceeded 410 V.
• For 400-VAC SERVOPACKs
with DC-bus power supply
input: The power supply volt-
age exceeded 820 V.
Measure the power supply voltage.
Set AC/DC power supply voltage
within the specified range.
The power supply is unstable, or
was influenced by a lightning
surge.
Measure the power supply voltage.
Improve the power supply condi-
tions, and turn the power supply ON
again after installing a surge
absorber. If the alarm still occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
Acceleration/deceleration was
executed under the following
conditions.
• The AC power supply voltage
of 200-VAC SERVOPACK
was in the range between 230
V and 270 V.
• The AC power supply voltage
of 400-VAC SERVOPACK
was in the range between 480
V and 560 V.
Check the power supply voltage and
the speed and torque during opera-
tion.
Set AC power supply voltage within
the specified range.
The moment of inertia exceeded
the allowable value.
Confirm that the moment of inertia
ratio is within the allowable range.
Increase the deceleration time, or
reduce the load.
SERVOPACK failure
−
Turn the control power OFF and
then ON again while the main cir-
cuit power supply is OFF. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
(cont’d)
Alarm:
Alarm Name
Cause
Investigative Actions
Corrective Actions