YASKAWA JUSP-MD D01A Series User Manual page 299

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
A.400:
Overvoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
A.410:
Undervoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
9-10
Cause
A power supply voltage of 580
VAC or higher was detected.
The power supply is unstable, or
was influenced by a lightning
surge.
Voltage for AC power supply was
too high during acceleration or
deceleration.
The regenerative resistance is too
high for the actual operating con-
ditions.
The moment of inertia ratio
exceeded the allowable value.
The fuse in the converter's regen-
eration circuit is blown out.
The connection of the I/O signals
(CN901) between the SERVO-
PACK and converter is faulty.
A fault occurred in the SERVO-
PACK or converter.
The AC power supply voltage
dropped to 240 V or less for a
400-VAC SERVOPACK.
The power supply voltage
dropped during operation.
Occurrence of instantaneous
power interruption.
The converter fuse is blown out.
The 1 and 2 terminals of the
converter are open.
A fault occurred in the SERVO-
PACK or converter.
Investigative Actions
Measure the power supply voltage.
Measure the power supply voltage.
Check the power supply voltage and
the speed and torque during opera-
tion.
Check the operating conditions and
the regenerative resistance.
Confirm that the moment of inertia
ratio is within the allowable range.
Check for a Regeneration Error
alarm (A.300) and check the
CHARGE indicator on the con-
verter to see if it remains lit for
more than a few seconds immedi-
ately after the main circuit power
supply is turned OFF.
Check the connection of CN901.
−
Measure the power supply voltage.
Measure the power supply voltage.
Measure the power supply voltage.
−
Check the 1 and 2 terminals on
the converter.
−
(cont'd)
Corrective Actions
Set AC power supply voltage within
the specified range.
Improve the power supply condi-
tions by installing a surge absorber,
etc. Then, turn the power supply
OFF and ON again. If the alarm still
occurs, the SERVOPACK or con-
verter may be faulty. Replace the
SERVOPACK or converter.
Set AC power supply voltage within
the specified range.
Select a regenerative resistance
value appropriate for the operating
conditions and load.
Increase the deceleration time, or
reduce the load.
The converter may be faulty.
Replace the converter.
Correctly connect CN901.
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 or converter may be faulty.
Replace the SERVOPACK or con-
verter.
Set the power supply voltage within
the specified range.
Increase the power supply capacity.
When the instantaneous power cut
hold time (Pn509) is set, decrease
the setting.
Replace the converter, connect a
reactor, and run the SERVOPACK
and converter.
Correctly connect the 1 and
terminals on the converter.
The SERVOPACK or converter
may be faulty. Replace the SERVO-
PACK or converter.
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