YASKAWA Σ-V Series User Manual page 273

8 Troubleshooting
8.2.2 Troubleshooting of Warnings
Warning
Warning Name
Display
A.971 Undervoltage
8-28
Situation at Warning
Occurrence
• For 100-VAC SER-
VOPACKs:
The AC power supply
voltage is 60 V or
below.
• For 200-VAC SER-
VOPACKs:
The AC power supply Measure the power supply voltage.
voltage is 140 V or
below.
• For 400-VAC SER-
VOPACKs:
The AC power supply
voltage is 280 V or
below.
The power supply volt-
age dropped during Measure the power supply voltage.
operation.
An instantaneous power
Measure the power supply voltage.
failure occurred.
The fuse in the SERVO-
–
PACK is burned out.
A SERVOPACK fault
–
occurred.
Cause
Use a power supply voltage within the
specified range.
Increase the power supply capacity.
Lower the instantaneous power cut
hold time (Pn509).
Replace the SERVOPACK and con-
nect an AC/DC reactor to the SERVO-
PACK.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Corrective Actions