12.3 Warning Displays
12.3.2 Troubleshooting Warnings
12-49
A.921:
Dynamic Brake
Overload (warning
before an A.731
alarm occurs)
The Servomotor
was rotated by an
external force.
Check the operation
status.
Implement measures to
ensure that the motor will
not be rotated by an exter-
nal force.
–
When the Servo-
motor was
stopped with the
dynamic brake,
the rotational or
linear kinetic
energy exceeded
the capacity of the
dynamic brake
resistor.
Check the power con-
sumed by the DB resis-
tor to see how
frequently the DB is
being used.
Reconsider the following:
• Reduce the Servomotor
command speed.
• Decrease the moment of
inertia or mass.
• Reduce the frequency of
stopping with the dynamic
brake.
–
A failure occurred
in the SERVO-
PACK.
–
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
–
A.923:
SERVOPACK Built-
in Fan Stopped
The fan inside the
SERVOPACK
stopped.
Check for foreign mat-
ter inside the SERVO-
PACK.
Remove foreign matter from
the SERVOPACK. If an
alarm still occurs, the SER-
VOPACK may be faulty.
Replace the SERVOPACK.
–
A.930:
Absolute Encoder
Battery Error (The
absolute encoder
battery voltage was
lower than the spec-
ified level.) (Detected
only when an abso-
lute encoder is con-
nected.)
The battery con-
nection is faulty or
a battery is not
connected.
Check the battery con-
nection.
Correct the battery connec-
tion.
page 4-20
The battery volt-
age is lower than
the specified value
(2.7 V).
Measure the battery
voltage.
Replace the battery.
page 12-3
A failure occurred
in the SERVO-
PACK.
–
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
–
A.941:
Change of Parame-
ters Requires
Restart
Parameters have
been changed
that require the
power supply to
be turned OFF
and ON again.
–
Turn the power supply to
the SERVOPACK OFF and
ON again.
–
A.942:
Speed Ripple Com-
pensation Informa-
tion Disagreement
The speed ripple
compensation
information stored
in the encoder
does not agree
with the speed
ripple compensa-
tion information
stored in the SER-
VOPACK.
–
Reset the speed ripple
compensation value on the
SigmaWin+.
–
–
Set Pn423 to n.1 (Do
not detect A.942 alarms).
However, changing the set-
ting may increase the speed
ripple.
–
–
Set Pn423 to n.0
(Disable torque ripple com-
pensation). However,
changing the setting may
increase the speed ripple.
–
Continued from previous page.
Warning Number:
Warning Name
Possible Cause Confirmation Correction Reference
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