Troubleshooting Warnings - YASKAWA Sigma-7 Series Product Manual

6.2.2

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
A.90D:
Position Deviation
Between Axes Over-
flow Warning
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)
Twisting of
mechanical parts Check the position
has occurred deviation between the
between axes A axes.
and B.
Axis A and axis B
Check the reference
are not synchro-
position for Axis A and
nized with the ref-
Axis B.
erence.
The value of
×
(Pn66A Pn669/ Check if the value of
100) is low for the (Pn66A
operating condi- appropriate.
tions.
6.2.2 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 using
a MECHATROLINK com-
mand. Or, smooth the posi-
tion reference acceleration
by selecting the position
reference filter (ACCFIL)
using a MECHATROLINK
command.
Optimize the settings of
Pn520 and Pn51E.
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Optimize the setting of
Pn528 (Position Deviation
Overflow Warning Level at
Servo ON).
Resolve the twisting of
mechanical parts between
the axes.
Set the Position Correction
Table to appropriate values.
The host controller should
command the system to
synchronize operation of
axis A and axis B.
Set Pn66A and Pn669 to
×
Pn669/100) is
appropriate values.
6.2 Warning Displays
Reference
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page 3-7
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page 5-3
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