YASKAWA SGD7S Product Manual page 520

Warning Number:
Possible Cause
Warning Name
The speed ripple
compensation
information stored
A.942:
in the encoder
does not agree
Speed Ripple Com-
pensation Informa- with the speed
tion Disagreement ripple compensa-
tion information
stored in the
SERVOPACK.
For a 200-V
SERVOPACK, the
AC power supply
voltage dropped
below 140 V.
For a 100-V
SERVOPACK, the
AC power supply
voltage dropped
below 60 V.
The power supply
A.971:
voltage dropped
Undervoltage
during operation.
A momentary
power interrup-
tion occurred.
The SERVOPACK
fuse is blown out.
A failure occurred
in the SERVO-
PACK.
A.9A0:
Overtravel was
Overtravel (Over-
detected while the
travel status was
servo was ON.
detected.)
One of the con-
A.9b0:
sumable parts has
Preventative Mainte-
reached the end
nance Warning
of its service life.
Confirmation
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 speed ripple com-
– pensation). However,
changing the setting may
increase the speed ripple.
Set the power supply volt-
Measure the power
age within the specified
supply voltage.
range.
Set the power supply volt-
Measure the power
age within the specified
supply voltage.
range.
Measure the power Increase the power supply
supply voltage. capacity.
If you have changed the
Measure the power setting of Pn509 (Momen-
supply voltage. 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.
Check the status of the
• Do not specify move-
overtravel signals on
ments that would cause
the input signal monitor.
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.
12.3 Warning Displays
12.3.2 Troubleshooting Warnings
Continued from previous page.
Correction Reference
page 8-60
page 8-60
page 8-60
–
–
–
page 6-12
page 4-24
–
page 5-35
page 9-17
12
12-51