YASKAWA Sigma-V Series User Manual page 259

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
A.330:
Main Circuit Power
Supply Wiring Error
(Detected when the
power to the main circuit
is turned ON.)
A.400:
Overvoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
8-10
Cause
The regenerative resistor unit was
disconnected when the power
supply voltage to the SERVO-
PACK and converter was high.
DC power was supplied.
An regenerative resistor unit is
not connected.
The 1 and 2 terminals of the
converter are open.
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.
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.
Investigative Actions
Measure the resistance of the regen-
erative resistor unit using a measur-
ing instrument.
Check the power supply to see if it
is a AC power supply.
Check the regenerative resistor unit
connection.
Check the 1 and 2 terminals on
the converter.
Check the connection of CN901.
−
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.
−
(cont'd)
Corrective Actions
Replace the regenerative resistor
unit.
Use an AC power supply.
Connect the regenerative resistor
unit.
Correctly connect the 1 and
terminals on the converter.
Correctly connect CN901.
The SERVOPACK or converter
may be faulty. Replace the SERVO-
PACK or converter.
Set AC power supply voltage within
the specified range.
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.
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.
2