YASKAWA SGD7S series Product Manual page 165

Warning Number:
Possible Cause
Warning Name
The power supply
voltage exceeded
the specified
range.
There is insuffi-
cient external
regenerative resis-
tance, regenera-
A.920:
tive resistor
capacity, or SER-
Regenerative Over-
VOPACK capac-
load (warning before
ity, or there has
an A.320 alarm
been a continuous
occurs)
regeneration
state.
There was a con-
tinuous regenera-
tion state because
a negative load
was continuously
applied.
The Servomotor
was rotated by an
external force.
When the Servo-
motor was
A.921:
stopped with the
dynamic brake,
Dynamic Brake
the rotational or
Overload (warning
linear kinetic
before an A.731
energy exceeded
alarm occurs)
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.
4.2 SERVOPACKs with MECHATROLINK-III Communications References
Confirmation
Measure the power
supply voltage.
Check the operating
conditions or the
capacity using the Sig-
maJunmaSize+ Capac-
ity Selection Software
or another means.
Check the load applied
to the Servomotor
during operation.
Check the operation
status.
Check the power con-
sumed by the DB resis-
tor to see how
frequently the DB is
being used.
–
Check for foreign mat-
ter inside the SERVO-
PACK.
Check the battery con-
nection.
Measure the battery
voltage.
–
4.2.6 Troubleshooting Warnings
Continued from previous page.
Correction
Set the power supply volt-
age within the specified
range.
Change the regenerative
resistance value, regenera-
tive resistance capacity, or
SERVOPACK capacity.
Reconsider the operating
conditions using the Sigma-
JunmaSize+ Capacity
Selection Software or other
means.
Reconsider the system
including the servo,
machine, and operating
conditions.
Implement measures to
ensure that the motor will
not be rotated by an exter-
nal force.
Reconsider the following:
• Reduce the Servomotor
command speed.
• Decrease the moment of
inertia or mass.
• Reduce the frequency of
stopping with the dynamic
brake.
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
Remove foreign matter from
the SERVOPACK. If an
alarm still occurs, the SER-
VOPACK may be faulty.
Replace the SERVOPACK.
Correct the battery connec-
tion.
Replace the battery.
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
Continued on next page.
Reference
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4-97