YASKAWA Sigma-7 SGD7S Series - Page 608

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.730
(1730h)
and
A.731
(1731h)
Dynamic Brake
Overload (An
excessive
power con-
sumption by the
dynamic brake
was detected.)
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
external force.
–
When the Servomotor
was stopped with the
dynamic brake, the
rotational or linear
kinetic energy
exceeded the capacity
of the Dynamic Brake
Resistor.
Check the power
consumed by the DB
resistor to see how
frequently the DB is
being used.
Reconsider the fol-
lowing:
n Reduce the Ser-
vomotor com-
mand speed.
n Decrease the
moment of inertia
ratio or mass
ratio.
n Reduce the fre-
quency of stop-
ping with the
dynamic brake.
–
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.740
(1740h)
Inrush Current
Limiting
Resistor Over-
load (The main
circuit power
supply was fre-
quently turned
ON and OFF.)
The allowable fre-
quency of the inrush
current limiting
resistor was exceeded
when the main circuit
power supply was
turned ON and OFF.
– Reduce the fre-
quency of turning the
main circuit power
supply ON and OFF.
–
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.7A1
(17A1h)
Internal Temper-
ature Error 1
(Control Board
Temperature
Error)
The surrounding tem-
perature is too high.
Check the sur-
rounding tempera-
ture using a ther-
mometer. Or, check
the operating status
with the SERVO-
PACK installation
environment monitor.
Decrease the sur-
rounding tempera-
ture by improving the
SERVOPACK instal-
lation conditions.
Ä Chap. 4.6
‘Monitoring the
Installation
Environment’
page 80
An overload alarm
was reset by turning
OFF the power supply
too many times.
Check the alarm dis-
play to see if there is
an overload alarm.
Change the method
for resetting the
alarm.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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