YASKAWA SGD7S-****20A Series - Page 473

12.3 Warning Displays
12.3.2 Troubleshooting Warnings
12-54
A.920:
Regenerative Over-
load (warning before
an A.320 alarm
occurs)
The power supply
voltage exceeded
the specified
range.
Measure the power
supply voltage.
Set the power supply volt-
age within the specified
range.
–
There is insuffi-
cient external
regenerative resis-
tance, regenera-
tive resistor
capacity, or
SERVOPACK
capacity, or there
has been a con-
tinuous regenera-
tion state.
Check the operating
conditions or the
capacity using the Sig-
maJunmaSize+ Capac-
ity Selection Software
or another means.
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.
–
There was a con-
tinuous regenera-
tion state because
a negative load
was continuously
applied.
Check the load applied
to the Servomotor
during operation.
Reconsider the system
including the servo,
machine, and operating
conditions.
–
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
SERVOPACK 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 4-27
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.
–
Continued on next page.
Continued from previous page.
Warning Number:
Warning Name
Possible Cause Confirmation Correction Reference