YASKAWA E-7-Series SGD7S - Troubleshooting Warnings

12.3 Warning Displays
12.3.2 Troubleshooting Warnings
12-46
Note: 1. A warning code is not output unless you set Pn001 to n.1 (Output both alarm codes and warning
codes).
2. If you sent Pn008 to n.1 (Do not detect warnings), no warnings will be detected except for A.971
warnings (Undervoltage).
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 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 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 5-47
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 6-27
The setting of
Pn520 (Excessive
Position Error
Alarm Level) is too
low for the operat-
ing conditions.
Check Pn520 (Exces-
sive Position Error
Alarm Level) to see if it
is set to an appropriate
value.
Optimize the setting of
Pn520.
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 (Excessive Position
Error Warning Level at
Servo ON).
page 8-10