YASKAWA Σ-V Series User Manual page 255

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.400:
Overvoltage
(Detected in the SER-
VOPACK's main circuit
power supply section.)
8-10
Cause
• For 100 VAC SERVOPACKs:
The AC power supply voltage
exceeded 145 V.
• For 200 VAC SERVOPACKs:
The AC power supply voltage
exceeded 290 V.
• For 400 VAC SERVOPACKs:
The AC power supply voltage
exceeded 580 V.
• For 200 VAC SERVOPACKs
with DC power supply input:
The power supply voltage
exceeded 410 V.
• For 400 VAC SERVOPACKs
with DC power supply input:
The power supply voltage
exceeded 820 V.
The power supply is unstable, or
was influenced by a lightning
surge.
Acceleration/deceleration was
executed under the following
conditions.
• The AC power supply voltage
of 100 VAC SERVOPACK was
in the range between 115 V and
135 V.
• 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.
The external regenerative resis-
tance is too high for the actual
operation conditions.
The mass exceeded the allowable
value.
A SERVOPACK fault occurred.
Investigative Actions
Measure the power supply voltage.
Measure the power supply voltage.
Check the power supply voltage and
the speed and force during opera-
tion.
Check the operation conditions and
the regenerative resistance.
Confirm that the mass ratio is
within the allowable load.
−
Corrective Actions
Set AC/DC power supply voltage
within the specified range.
Improve the power supply condi-
tions by installing a surge absorber,
etc. Then, turn the power supply
ON again. If the alarm still occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
Set AC power supply voltage within
the specified range.
Select a regenerative resistance
value appropriate for the operation
conditions and load.
Increase the deceleration time, or
reduce the load.
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.