YASKAWA Sigma-V Series User Manual page 275

8 Troubleshooting
8.2.2 Troubleshooting of Warnings
Warning Num-
ber: Warning
Name (Warning
Description)
A.971:
Undervoltage
(Converter Main
Circuit
Undervoltage)
A.9A0:
Overtravel
(Overtravel status
is detected.)
8-26
Cause
The converter's main
circuit power supply Measure the power supply voltage.
was 280 V or lower.
The power supply volt-
age dropped during Measure the power supply voltage.
operation.
Occurrence of instanta-
neous power interrup- Measure the power supply voltage.
tion.
A fault occurred in the
−
SERVOPACK or con-
verter.
When the servomotor Check the input signal monitor
power is ON, over- (Un005) to check the status of the
travel status is detected. overtravel signals.
Investigative Actions
(cont'd)
Corrective Actions
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.
The SERVOPACK or converter may
be faulty. Replace the SERVOPACK
or converter.
Refer to 8.4 Troubleshooting Malfunc-
tion Based on Operation and Condi-
tions of the Servomotor. Even if
overtravel signals were not shown by
the input signal monitor (Un005),
momentary overtravel may have been
detected. Take the following precau-
tions.
• Do not specify movements that
would cause overtravel from the
host controller.
• Check the wiring of the overtravel
signals.
• Take countermeasures for noise.