YASKAWA SGD7S-xxxDA0 series Product Manual page 556

16.3 Warning Displays
16.3.2 Troubleshooting Warnings
Warning Number:
Warning Name
901h:
Position Deviation
Overflow Alarm at
Servo ON
910h:
Overload (warning
before an A.710 or
A.720 alarm occurs)
911h:
Vibration
16-50
Possible Cause Confirmation
The position devi-
ation when the
servo was turned
ON exceeded the
percentage set
–
with the following
formula:
(Pn526 (2526h) ×
Pn528
(2528h)/100)
The wiring is not
correct or there is
a faulty contact in Check the wiring.
the motor or
encoder wiring.
Operation was
performed that
Check the motor over-
exceeded the
load characteristics and
overload protec-
Run command.
tion characteris-
tics.
An excessive load
was applied
during operation
Check the operation
because the Ser-
reference and motor
vomotor was not
speed.
driven because of
mechanical prob-
lems.
The overload
Check that the overload
warning level
warning level (Pn52B
(Pn52B (252Bh))
(252Bh)) is suitable.
is not suitable.
A failure occurred
in the SERVO- –
PACK.
Check for abnormal
Abnormal vibra-
motor noise, and check
tion was detected
the speed and torque
during motor
waveforms during oper-
operation.
ation.
The setting of
Pn103 (2103h)
(Moment of Iner-
Check the moment of
tia Ratio) is
inertia ratio or mass
greater than the
ratio.
actual moment of
inertia or was
greatly changed.
The vibration
Check that the vibration
detection level
detection level (Pn312
(Pn312 (2312h) or
(2312h) or Pn384
Pn384 (2384h)) is
(2384h)) is suitable.
not suitable.
Continued from previous page.
Correction
Optimize the setting of
Pn528 (2528h) (Excessive
Position Error Warning Level
at Servo ON).
Make sure that the Servo-
motor and encoder are cor-
rectly wired.
Reconsider the load and
operating conditions. Or,
increase the motor capacity.
Remove the mechanical
problem.
Set a suitable overload
warning level (Pn52B
(252Bh)).
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
Reduce the motor speed.
Or, reduce the servo gain
with custom tuning.
Correct the setting of
Pn103 (2103h).
Set a suitable vibration
detection level (Pn312
(2312h) or Pn384 (2384h)).
Continued on next page.
Reference
–
–
–
–
page 6-40
–
page 9-41
page 9-16
page 7-46