Troubleshooting Warnings - YASKAWA SGD7S series Product Manual

9.2 Warning Displays

9.2.2 Troubleshooting Warnings

9.2.2

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.90A:
Gap Sensor Signal
AD Error
9-42
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 exceeded
the parameter set-
tings (Pn526 ×
–
Pn528/100) when
the servo was
turned ON.
The gap was 0 or
See if the gap is 0 or
lower during
lower.
clearance control.
Wiring of the gap
Check the wiring of the
sensor is incor-
gap sensor.
rect.
Check the output volt-
A failure occurred
age from the gap sen-
in the gap sensor.
sor.
A failure occurred
in the SERVO- –
PACK.
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 an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Optimize the setting of
Pn528 (Position Deviation
Overflow Warning Level at
Servo ON).
• Operate the system so
that the gap does not
become 0 or less.
• Adjust the clearance con-
trol feedback offset from
the SigmaWin+, or per-
form Fn009 on the Digital
Operator. Also, correctly
set Pn6F6 (AD Input Gain)
and Pn6F8 (AD Zero Cor-
rection).
Correctly wire the gap sen-
sor.
Replace the gap sensor if
the output is not correct.
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
Continued on next page.
Reference
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page 5-18
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page 5-7
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