Troubleshooting Warnings - YASKAWA SGD7S Product Manual

14.3 Warning Displays

14.3.2 Troubleshooting Warnings

Warning
Number
A.A98
A.A99
Note: 1. A warning code is not output unless you set Pn001 to n.1 (Output both alarm codes and warning
2. Use Pn008 = n.X (Warning Detection Selection) to select warning detection. However, the following
14.3.2 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 Number:
Warning Name
A.900:
Position Deviation
Overflow
A.901:
Position Deviation
Overflow Alarm at
Servo ON
14-50
Warning Name
Main Circuit Power Error
Rotary Switch Change
Warning
codes).
warnings are not affected by the setting of Pn008 = n.X and other parameter settings are required in
addition to Pn008 = n.X.
Warning Parameters That Must Be Set to Select Warning Detection
A.911 Pn310 = n.X (Vibration Detection Setting)
A.930 Pn008 = n.X (Low Battery Voltage Alarm/Warning Selection)
Pn423 = n.X (Speed Ripple Compensation Information Dis-
A.942
agreement Warning Detection Selection)
Pn008 = n.X (Function Selection for Undervoltage)
A.971
(Not affected by the setting of Pn008 = n.X.)
A.9b0 Pn00F = n.X (Preventative Maintenance Selection)
Possible Cause
The Servomotor
U, V, and W wiring
is not correct.
A SERVOPACK
gain is too low.
The acceleration
of the position ref-
erence is too high.
The excessive
position deviation
alarm level (Pn520
× Pn51E/100) is
too low for the
operating condi-
tions.
A failure occurred
in the SERVO-
PACK.
The position devi-
ation when the
servo was turned
ON exceeded the
percentage set
with the following
formula:
(Pn526 × Pn528/
100)
The main circuit power supply is not ON.
A rotary switch setting was changed after the power supply was
turned ON or reset.
Confirmation
Check the wiring of the
Servomotor's Main Cir-
cuit Cables.
Check the SERVO-
PACK gains.
Reduce the reference
acceleration and try
operating the SERVO-
PACK.
Check excessive posi-
tion deviation alarm
level (Pn520 × Pn51E/
100) to see if it is set to
an appropriate value.
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Continued from previous page.
Meaning
Reference
page 6-26
page 14-2
page 8-60
page 6-5
page 9-14
Correction
Make sure that there are no
faulty connections in the
wiring for the Servomotor
and encoder.
Increase the servo gain,
e.g., by using autotuning
without a host reference.
Reduce the settings of
PnB2A (Acceleration Rate)
and PnB2B (Deceleration
Rate) to reduce the acceler-
ation rate of the positioning
reference.
Optimize the settings of
Pn520 and Pn51E.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Optimize the setting of
Pn528 (Excessive Position
Error Warning Level at
Servo ON).
Continued on next page.
Reference
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page 8-23
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page 8-7
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