YASKAWA SGD7S Product Manual page 495

14.3 Warning Displays
14.3.2 Troubleshooting Warnings
Warning Number:
Warning Name
A.93B:
Overheat Warning
A.942:
Speed Ripple Com-
pensation Informa-
tion Disagreement
A.971:
Undervoltage
A.9b0:
Preventative Mainte-
nance Warning
14-54
Possible Cause Confirmation
The surrounding Check the surrounding
temperature is too temperature using a
high. thermostat.
Operation was Use the accumulated
performed under load ratio to check the
an excessive load. load during operation.
A failure occurred
in the SERVO- –
PACK.
The temperature
detection circuit in
the Linear Servo-
motor is faulty or –
the sensor
attached to the
machine is faulty.
−
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 SER-
VOPACK, the AC
Measure the power
power supply volt-
supply voltage.
age 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.
A momentary
Measure the power
power interrup-
supply voltage.
tion occurred.
The SERVOPACK
−
fuse is blown out.
A failure occurred
−
in the SERVO-
PACK.
One of the con-
sumable parts has
−
reached the end
of its service life.
Continued from previous page.
Correction
Lower the surrounding tem-
perature by improving the
installation conditions of the
Linear Servomotor or the
machine.
Reconsider the load and
operating conditions.
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
The temperature detection
circuit in the Linear Servo-
motor may be faulty or the
sensor attached to the
machine may be faulty.
Replace the Linear Servo-
motor or repair the sensor
attached to the machine.
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.
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.
Replace the part. Contact
your Yaskawa representa-
tive for replacement.
Continued on next page.
Reference
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–
–
–
page 8-60
page 8-60
page 8-60
−
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page 6-5
page 4-24
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page 9-15