
8 Troubleshooting
8.1.2 Troubleshooting of Alarms
8-10
A.330:
Main Circuit Power
Supply Wiring Error
(Detected when the
power to the main circuit
is turned ON.)
The regenerative resistor unit was
disconnected when the power
supply voltage to the SERVO-
PACK and converter was high.
Measure the resistance of the regen-
erative resistor unit using a measur-
ing instrument.
Replace the regenerative resistor
unit.
DC power was supplied.
Check the power supply to see if it
is a AC power supply.
Use an AC power supply.
An regenerative resistor unit is
not connected.
Check the regenerative resistor unit
connection.
Connect the regenerative resistor
unit.
The 1 and 2 terminals of the
converter are open.
Check the 1 and 2 terminals on
the converter.
Correctly connect the 1 and 2
terminals on the converter.
The connection of the I/O signals
(CN901) between the SERVO-
PACK and converter is faulty.
Check the connection of CN901.
Correctly connect CN901.
A fault occurred in the SERVO-
PACK or converter.
−
The SERVOPACK or converter
may be faulty. Replace the SERVO-
PACK or converter.
A.400:
Overvoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
A power supply voltage of 580
VAC or higher was detected.
Measure the power supply voltage.
Set AC 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, e.g., by installing a surge
absorber. Then, turn the main circuit
power supply OFF and ON again. If
the alarm still occurs, the SERVO-
PACK or converter may be faulty.
Replace the SERVOPACK or con-
verter.
Voltage for AC power supply was
too high during acceleration or
deceleration.
Check the power supply voltage and
the speed and torque during opera-
tion.
Set AC power supply voltage within
the specified range.
The regenerative resistance is too
high for the actual operating con-
ditions.
Check the operating conditions and
the regenerative resistance.
Select a regenerative resistance
value appropriate for the operating
conditions and load.
The moment of inertia ratio
exceeded the allowable value.
Confirm that the moment of inertia
ratio is within the allowable range.
Increase the deceleration time, or
reduce the load.
The fuse in the converter’s regen-
eration circuit is blown out.
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.
The converter may be faulty.
Replace the converter.
The connection of the I/O signals
(CN901) between the SERVO-
PACK and converter is faulty.
Check the connection of CN901.
Correctly connect CN901.
A fault occurred in the SERVO-
PACK or converter.
−
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.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause
Investigative Actions
Corrective Actions
Содержание Sigma-V JUSP-MD D A Series
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