YASKAWA SGD7S-R70A Product Manual page 186

8.2 Warning Displays
8.2.2 Troubleshooting Warnings
Warning Number:
Warning Name
A.942:
Speed Ripple Com-
pensation Informa-
tion Disagreement
A.971:
Undervoltage
A.9A0:
Overtravel
(Overtravel status
was detected.)
A.9b0:
Preventative Mainte-
nance Warning
A.9F9:
INDEXER Warning
8-46
Possible Cause Confirmation
–
The speed ripple
compensation
information stored
in the encoder
–
does not agree
with the speed
ripple compensa-
tion information
stored in the SER-
–
VOPACK.
For a 200-V
SERVOPACK, the
Measure the power
AC power supply
supply voltage.
voltage dropped
below 140 V.
For a 100-V SER-
VOPACK, the AC
Measure the power
power supply volt-
supply voltage.
age dropped
below 60 V.
The power supply
Measure the power
voltage dropped
supply voltage.
during operation.
A momentary
Measure the power
power interrup-
supply voltage.
tion occurred.
The SERVOPACK
–
fuse is blown out.
A failure occurred
in the SERVO- –
PACK.
Overtravel was Check the status of the
detected while the overtravel signals on
servo was ON. the input signal monitor.
One of the con-
sumable parts has
–
reached the end
of its service life.
A warning Use the SigmaWin+ to
occurred in the identify the INDEXER
INDEXER. warning.
Continued from previous page.
Correction
Reset the speed ripple
compensation value on the
SigmaWin+.
Set Pn423 to n.1 (Do
not detect A.942 alarms).
However, changing the set-
ting may increase the speed
ripple.
Set Pn423 to n.0
(Disable torque ripple com-
pensation). However,
changing the setting may
increase the speed ripple.
Set the power supply volt-
age within the specified
range.
Set the power supply volt-
age within the specified
range.
Increase the power supply
capacity.
If you have changed the
setting of Pn509 (Momen-
tary Power Interruption Hold
Time), decrease the setting.
Replace the SERVOPACK
and connect a reactor.
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
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.
Replace the part. Contact
your Yaskawa representa-
tive for replacement.
Use the correction for the
INDEXER warning.
Reference
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page 8-47