YASKAWA SGD7S

12.3 Warning Displays
12.3.2 Troubleshooting Warnings
12-47
12
Maintenance
Note: 1. A warning code is not output unless you set Pn001 to n.1 (Output both alarm codes and warning
codes).
2. Use Pn008 = n.X (Warning Detection Selection) to control warning detection.
However, the following warnings are not affected by the setting of Pn008 = n.X and other parameter
settings are required in addition to Pn008 = n.X.
12.3.2 Troubleshooting Warnings
The causes of and corrections for the warnings are given in the following table. Contact your
Yaskawa representative if you cannot solve a problem with the correction given in the table.
Warning Parameters That Must Be Set to Select Warning Detection Reference
A.911 Pn310 = n.X (Vibration Detection Selection) page 6-97
A.923
–
(Not affected by the setting of Pn008 = n.X.)
–
A.930 Pn008 = n.X (Low Battery Voltage Alarm/Warning Selection) page 12-3
A.942
Pn423 = n.X (Speed Ripple Compensation Information Dis-
agreement Warning Detection Selection)
page 8-60
A.971
Pn008 = n.X (Function Selection for Undervoltage)
(Not affected by the setting of Pn008 = n.X.)
page 6-13
A.9A0
Pn00D = n.X (Overtravel Warning Detection Selection)
(Not affected by the setting of Pn008 = n.X.)
page 5-35
A.9b0 Pn00F = n.X (Preventative Maintenance Warning Selection) page 9-17
Warning Number:
Warning Name
Possible Cause Confirmation Correction Reference
A.900:
Position Deviation
Overflow
The Servomotor
U, V, and W wiring
is not correct.
Check the wiring of the
Servomotor’s Main Cir-
cuit Cables.
Make sure that there are no
faulty connections in the
wiring for the Servomotor
and encoder.
–
A SERVOPACK
gain is too low.
Check the SERVO-
PACK gains.
Increase the servo gain,
e.g., by using autotuning
without a host reference.
page 8-24
The frequency of
the position refer-
ence pulse is too
high.
Reduce the reference
pulse frequency and try
operating the SERVO-
PACK.
Reduce the position refer-
ence pulse frequency or the
reference acceleration rate,
or reconsider the electronic
gear ratio.
page 5-48
The acceleration
of the position ref-
erence is too high.
Reduce the reference
acceleration and try
operating the SERVO-
PACK.
Apply smoothing, i.e., by
using Pn216 (Position Ref-
erence Acceleration/ Decel-
eration Time Constant).
page 6-29
The excessive
position deviation
alarm level (Pn520
× Pn51E/100) is
too low for the
operating condi-
tions.
Check excessive posi-
tion deviation alarm
level (Pn520 × Pn51E/
100) to see if it is set to
an appropriate value.
Optimize the settings of
Pn520 and Pn51E.
page 8-8
A failure occurred
in the SERVO-
PACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
–
A.901:
Position Deviation
Overflow Alarm at
Servo ON
The position devi-
ation exceeded
the parameter set-
tings (Pn526 ×
Pn528/100) when
the servo was
turned ON.
–
Set the position deviation to
be cleared while the servo is
OFF.
Optimize the setting of
Pn528 (Position Deviation
Overflow Warning Level at
Servo ON).
page 8-10
Continued on next page.