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