12.3 Warning Displays
12.3.2 Troubleshooting Warnings
12-51
A.942:
Speed Ripple Com-
pensation Informa-
tion Disagreement
The speed ripple
compensation
information stored
in the encoder
does not agree
with the speed
ripple compensa-
tion information
stored in the
SERVOPACK.
–
Reset the speed ripple
compensation value on the
SigmaWin+.
page 8-60
–
Set Pn423 to n.1 (Do
not detect A.942 alarms).
However, changing the set-
ting may increase the speed
ripple.
page 8-60
–
Set Pn423 to n.0
(Disable speed ripple com-
pensation). However,
changing the setting may
increase the speed ripple.
page 8-60
A.971:
Undervoltage
For a 200-V
SERVOPACK, the
AC power supply
voltage dropped
below 140 V.
Measure the power
supply voltage.
Set the power supply volt-
age within the specified
range.
–
For a 100-V
SERVOPACK, the
AC power supply
voltage dropped
below 60 V.
Measure the power
supply voltage.
Set the power supply volt-
age within the specified
range.
–
The power supply
voltage dropped
during operation.
Measure the power
supply voltage.
Increase the power supply
capacity.
–
A momentary
power interrup-
tion occurred.
Measure the power
supply voltage.
If you have changed the
setting of Pn509 (Momen-
tary Power Interruption Hold
Time), decrease the setting.
page 6-12
The SERVOPACK
fuse is blown out.
–
Replace the SERVOPACK
and connect a reactor.
page 4-24
A failure occurred
in the SERVO-
PACK.
–
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
–
A.9A0:
Overtravel (Over-
travel status was
detected.)
Overtravel was
detected while the
servo was ON.
Check the status of the
overtravel signals on
the input signal monitor.
Even if an overtravel signal
is not shown by the input
signal monitor, momentary
overtravel may have been
detected. Take the following
precautions.
• Do not specify move-
ments that would cause
overtravel from the host
controller.
• Check the wiring of the
overtravel signals.
• Implement countermea-
sures against noise.
page 5-35
A.9b0:
Preventative Mainte-
nance Warning
One of the con-
sumable parts has
reached the end
of its service life.
–
Replace the part. Contact
your Yaskawa representa-
tive for replacement.
page 9-17
Continued from previous page.
Warning Number:
Warning Name
Possible Cause Confirmation Correction Reference
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