9 Troubleshooting
9.2.2 Troubleshooting of Warnings
9-24
A.971:
Undervoltage
The AC power supply
voltage dropped to 280
V or less for a 400-VAC
SERVOPACK.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
The power supply volt-
age dropped during
operation.
Measure the power supply voltage. Increase the power supply capacity.
Occurrence of instanta-
neous power interrup-
tion.
Measure the power supply voltage.
When the instantaneous power cut
hold time (Pn509) is set, decrease the
setting.
A fault occurred in the
SERVOPACK or con-
verter.
−
The SERVOPACK or converter may
be faulty. Replace the SERVOPACK
or converter.
A.9A0:
Overtravel
(Overtravel status
is detected.)
When the servomotor
power is ON, over-
travel status is detected.
Check the input signal monitor
(Un005) to check the status of the
overtravel signals.
Refer to
9.3 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.
(cont’d)
Warning Num-
ber: Warning
Name (Warning
Description)
Cause Investigative Actions Corrective Actions
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