YASKAWA Sigma-7 SGD7S Series - Page 641

Warning
Code
Warning Name Possible Cause Confirmation Correction Reference
A.901
(1901h)
Position Devia-
tion Overflow
Alarm at Servo
ON
The position deviation
when the servo was
turned ON exceeded
the percentage set
with the following for-
mula: (Pn526 ×
Pn528/100)
– Optimize the setting
of Pn528 (Position
Deviation Overflow
Warning Level at
Servo ON).
–
A.910
(1910h)
Overload
(warning before
an A.710 or
A.720 alarm
occurs)
The wiring is not cor-
rect or there is a faulty
connection in the
motor or encoder
wiring.
Check the wiring. Make sure that the
Servomotor and
encoder are correctly
wired.
–
Operation was per-
formed that exceeded
the overload protec-
tion characteristics.
Check the motor
overload characteris-
tics and Run com-
mand.
Reconsider the load
and operating condi-
tions. Or, increase
the motor capacity.
–
An excessive load
was applied during
operation because the
Servomotor was not
driven because of
mechanical problems.
Check the operation
reference and motor
speed.
Remove the
mechanical problem.
–
The overload warning
level (Pn52B) is not
suitable.
Check that the over-
load warning level
(Pn52B) is suitable.
Set a suitable over-
load warning level
(Pn52B).
Ä Chap. 6.14
‘Motor Overload
Detection Level’
page 176
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.911
(1911h)
Vibration Abnormal vibration
was detected during
motor operation.
Check for abnormal
motor noise, and
check the speed and
torque waveforms
during operation.
Reduce the motor
speed. Or, reduce
the servo gain with
custom tuning.
Ä Chap. 9.9
‘Custom Tuning’
page 350
The setting of Pn103
(Moment of Inertia
Ratio) is greater than
the actual moment of
inertia or was greatly
changed.
Check the moment
of inertia ratio or
mass ratio.
Correct the setting of
Pn103.
Ä Chap. 9.6
‘Estimating the
Moment of
Inertia’
page 308
The vibration detec-
tion level (Pn312 or
Pn384) is not suitable.
Check that the vibra-
tion detection level
(Pn312 or Pn384) is
suitable.
Set a suitable vibra-
tion detection level
(Pn312 or Pn384).
Ä Chap. 7.12
‘Initializing the
Vibration Detec-
tion Level’
page 246
Sigma-7 Series SERVOPACKs
Maintenance
Warning Displays > Troubleshooting Warnings
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