YASKAWA SGM7D-30F Product Manual page 252

3.4.7 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
3.4 Command Option Attachable-type FT82 SERVOPACKs with INDEXER Modules
Possible Cause Confirmation
The Servomotor Check the wiring of the
U, V, and W wiring Servomotor's Main Cir-
is not correct. cuit Cables.
A SERVOPACK Check the SERVO-
gain is too low. PACK gains.
Reduce the reference
The acceleration
acceleration and try
of the position ref-
operating the SERVO-
erence is too high.
PACK.
The excessive
position deviation Check excessive posi-
alarm level (Pn520 tion deviation alarm
× Pn51E/100) is level (Pn520 × Pn51E/
too low for the 100) to see if it is set to
operating condi- an appropriate value.
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)
3.4.7 Troubleshooting Warnings
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 acceleration of
the position reference with
one of the following meth-
ods.
• Reduce the acceleration
rate (ACC) and decelera-
tion rate (DEC) in the pro-
gram table.
• Reduce the settings of
PnB29 (Acceleration Rate)
and PnB2B (Deceleration
Rate).
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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