YASKAWA E-7S SERVOPACK SGD7S Product Manual page 569

15.3 Warning Displays
15.3.2 Troubleshooting Warnings
Warning Number:
Warning Name
A.920:
Regenerative Over-
load (warning before
an A.320 alarm
occurs)
A.921:
Dynamic Brake
Overload (warning
before an A.731
alarm occurs)
A.923:
SERVOPACK Built-
in Fan Stopped
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.)
15-58
Possible Cause Confirmation
The power supply
voltage exceeded Measure the power
the specified supply voltage.
range.
There is insuffi-
cient external
regenerative resis-
Check the operating
tance, regenera-
conditions or the
tive resistor
capacity using the Sig-
capacity, or SER-
maJunmaSize+ Capac-
VOPACK capac-
ity Selection Software
ity, or there has
or another means.
been a continuous
regeneration
state.
There was a con-
tinuous regenera-
Check the load applied
tion state because
to the Servomotor
a negative load
during operation.
was continuously
applied.
The Servomotor
Check the operation
was rotated by an
status.
external force.
When the Servo-
motor was
stopped with the
Check the power con-
dynamic brake,
sumed by the DB resis-
the rotational or
tor to see how
linear kinetic
frequently the DB is
energy exceeded
being used.
the capacity of the
dynamic brake
resistor.
A failure occurred
in the SERVO- –
PACK.
The fan inside the Check for foreign mat-
SERVOPACK ter inside the SERVO-
stopped. PACK.
The battery con-
nection is faulty or Check the battery con-
a battery is not nection.
connected.
The battery volt-
age is lower than Measure the battery
the specified value voltage.
(2.7 V).
A failure occurred
in the SERVO- –
PACK.
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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page 4-27
page 15-3
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