Troubleshooting Warnings - YASKAWA SGD7S Product Manual

14.3 Warning Displays

14.3.2 Troubleshooting Warnings

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
14-48
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 (Low Battery Voltage Alarm/Warning Selection)
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 exceeded
the parameter set-
tings (Pn526 ×
Pn528/100) when
the servo was
turned ON.
Confirmation
Make sure that there are no
Check the wiring of the
faulty connections in the
Servomotor's Main Cir-
wiring for the Servomotor
cuit Cables.
and encoder.
Increase the servo gain,
Check the SERVO-
e.g., by using autotuning
PACK gains.
without a host reference.
Reduce the settings of
Reduce the reference PnB2A (Acceleration Rate)
acceleration and try and PnB2B (Deceleration
operating the SERVO- Rate) to reduce the acceler-
PACK. ation rate of the positioning
reference.
Check excessive posi-
tion deviation alarm
Optimize the settings of
level (Pn520 × Pn51E/
Pn520 and Pn51E.
100) to see if it is set to
an appropriate value.
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).
Reference
page 6-26
page 14-2
page 8-60
page 6-5
page 9-14
Correction Reference
−
page 8-23
−
page 8-7
−
−
Continued on next page.