YASKAWA Sigma-7 SGD7S Series

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A.020
(1020h)
Parameter
Checksum Error
(There is an
error in the
parameter data
in the SERVO-
PACK.)
The power supply
voltage suddenly
dropped.
Measure the power
supply voltage.
Set the power supply
voltage within the
specified range, and
initialize the param-
eter settings.
Ä Chap. 6.2.6
‘Initializing SER-
VOPACK
Parameter Set-
tings’ page 140
The power supply was
shut OFF while writing
parameter settings.
Check the timing of
shutting OFF the
power supply.
Initialize the param-
eter settings and
then set the parame-
ters again.
The number of times
that parameters were
written exceeded the
limit.
Check to see if the
parameters were fre-
quently changed
from the host con-
troller.
The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
Reconsider the
method for writing
the parameters.
–
A malfunction was
caused by noise from
the AC power supply,
ground, static elec-
tricity, or other source.
Turn the power
supply to the SER-
VOPACK OFF and
ON again. If the
alarm still occurs,
noise may be the
cause.
Implement counter-
measures against
noise.
Ä Chap. 5.2.2
‘Countermeas-
ures against
Noise’ page 87
Gas, water drops, or
cutting oil entered the
SERVOPACK and
caused failure of the
internal components.
Check the installa-
tion conditions.
The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A failure occurred in
the SERVOPACK.
Turn the power
supply to the SER-
VOPACK OFF and
ON again. If the
alarm still occurs, the
SERVOPACK may
have failed.
The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.021
(1021h)
Parameter
Format Error
(There is an
error in the
parameter data
format in the
SERVOPACK.)
The software version
of the SERVOPACK
that caused the alarm
is older than the soft-
ware version of the
parameters specified
to write.
Read the product
information to see if
the software versions
are the same. If they
are different, it could
be the cause of the
alarm.
Write the parameters
from another SER-
VOPACK with the
same model and the
same software ver-
sion, and then turn
the power OFF and
ON again.
Ä Chap. 10.2
‘Monitoring
Product Infor-
mation’
page 433
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.022
(1022h)
System
Checksum Error
(There is an
error in the
parameter data
in the SERVO-
PACK.)
The power supply
voltage suddenly
dropped.
Measure the power
supply voltage.
The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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