11.2.3 Troubleshooting of the Servo Drive Alarms
When an error occurs in the servo drives, LEDs on the panel operator will light up. Refer to the following
table to identify the cause of an alarm and the action to be taken.
Contact your Yaskawa representative if the problem cannot be solved by the described corrective action.
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions
A.020:
Parameter Checksum
Error
(The parameter data in
the SERVOPACK is
incorrect.)
The power supply voltage sud-
denly dropped.
Measure the power supply voltage.
Set the power supply voltage within
the specified range, and initialize
the parameter.
The power supply went OFF
while changing a parameter set-
ting.
Note the circumstances when the
power supply went OFF.
Initialize the parameter and then set
the parameter again.
The number of times that parame-
ters were written exceeded the
limit.
Check to see if the parameters were
frequently changed through the host
controller.
The SERVOPACK may be faulty.
Repair or replace the SERVO-
PAC K .
Reconsider the method of writing
parameters.
Malfunction caused by noise
from the AC power supply or
grounding line, static electricity
noise, etc.
Turn the power supply ON and OFF
several times. If the alarm still
occurs, there may be noise interfer-
ence.
Take countermeasures against
noise.
Gas, water drops, or cutting oil
entered the SERVOPACK and
caused failure of the internal
components.
Check the installation conditions.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
SERVOPACK failure
Turn the power supply ON and OFF
several times. If the alarm still
occurs, the SERVOPACK is faulty.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.021:
Parameter Format
Error
(The data format of the
parameter in the SER-
VOPACK is incorrect.)
The software version of SERVO-
PAC K that cau sed the alarm is
older than that of the written
parameter.
Check SigmaWin for the Σ-V-SD
(MT) to see if the set software ver-
sion agrees with that of the SERVO-
PAC K . I f not, a n alar m m a y occur.
Write the parameter of another
SERVOPACK of the same model
with the same software version.
Then turn the power OFF and then
ON again.
SERVOPACK failure −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.022:
System Checksum
Error
(The parameter data in
the SERVOPACK is
incorrect.)
The power supply voltage sud-
denly dropped.
Measure the power supply voltage.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The power supply went OFF
while setting an utility function.
Note the circumstances when the
power supply went OFF.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
SERVOPACK failure
Turn the power supply ON and OFF
several times. If the alarm still
occurs, the SERVOPACK is faulty.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
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