YASKAWA SGD7S Product Manual page 459

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
Regenerative Over- capacity, or SER-
load (warning before VOPACK capac-
an A.320 alarm ity, or there has
occurs) been a continuous
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
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 Built- SERVOPACK
in Fan Stopped 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.
Confirmation
Set the power supply volt-
Measure the power
age within the specified
supply voltage.
range.
Change the regenerative
resistance value, regenera-
Check the operating
tive resistance capacity, or
conditions or the
SERVOPACK capacity.
capacity using the Sig-
Reconsider the operating
maJunmaSize+ Capac-
conditions using the Sigma-
ity Selection Software
JunmaSize+ Capacity
or another means.
Selection Software or other
means.
Reconsider the system
Check the load applied
including the servo,
to the Servomotor
machine, and operating
during operation.
conditions.
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.
12.3 Warning Displays
12.3.2 Troubleshooting Warnings
Continued from previous page.
Correction Reference
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page 12-3
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