YASKAWA SGDV-OCA05A

14.3 Warning Displays
14.3.2 Troubleshooting Warnings
14-50
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 select 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.
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.
A.A98 Main Circuit Power Error The main circuit power supply is not ON.
A.A99
Rotary Switch Change
Warning
A rotary switch setting was changed after the power supply was
turned ON or reset.
Warning Parameters That Must Be Set to Select Warning Detection Reference
A.911 Pn310 = n.X (Vibration Detection Setting) page 6-26
A.930 Pn008 = n.X (Low Battery Voltage Alarm/Warning Selection) page 14-2
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 6-5
A.9b0 Pn00F = n.X (Preventative Maintenance Selection) page 9-14
Continued from previous page.
Warning
Number
Warning Name Meaning
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 8-23
The acceleration
of the position ref-
erence is too high.
Reduce the reference
acceleration and try
operating the SERVO-
PACK.
Reduce the settings of
PnB2A (Acceleration Rate)
and PnB2B (Deceleration
Rate) to reduce the acceler-
ation rate of the positioning
reference.
−
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 8-7
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 when the
servo was turned
ON exceeded the
percentage set
with the following
formula:
(Pn526 × Pn528/
100)
−
Optimize the setting of
Pn528 (Excessive Position
Error Warning Level at
Servo ON).
−
Continued on next page.