Troubleshooting Of The Servo Drive Alarms - YASKAWA UAK series User Manual

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
The power supply voltage sud-
denly dropped.
The power supply went OFF
while changing a parameter set-
ting.
The number of times that parame-
ters were written exceeded the
A.020:
limit.
Parameter Checksum
Error
(The parameter data in
Malfunction caused by noise
the SERVOPACK is
from the AC power supply or
incorrect.)
grounding line, static electricity
noise, etc.
Gas, water drops, or cutting oil
entered the SERVOPACK and
caused failure of the internal
components.
SERVOPACK failure
The software version of SERVO-
A.021:
PACK that caused the alarm is
Parameter Format
older than that of the written
Error
parameter.
(The data format of the
parameter in the SER-
VOPACK is incorrect.)
SERVOPACK failure
The power supply voltage sud-
A.022:
denly dropped.
System Checksum
The power supply went OFF
Error
while setting an utility function.
(The parameter data in
the SERVOPACK is
SERVOPACK failure
incorrect.)
Cause Investigative Actions
Measure the power supply voltage.
Note the circumstances when the
power supply went OFF.
Check to see if the parameters were
frequently changed through the host
controller.
Turn the power supply ON and OFF
several times. If the alarm still
occurs, there may be noise interfer-
ence.
Check the installation conditions.
Turn the power supply ON and OFF
several times. If the alarm still
occurs, the SERVOPACK is faulty.
Check SigmaWin for the Σ-V-SD
(MT) to see if the set software ver-
sion agrees with that of the SERVO-
PACK. If not, an alarm may occur.
−
Measure the power supply voltage.
Note the circumstances when the
power supply went OFF.
Turn the power supply ON and OFF
several times. If the alarm still
occurs, the SERVOPACK is faulty.
11.2 Alarm Displays
Corrective Actions
Set the power supply voltage within
the specified range, and initialize
the parameter.
Initialize the parameter and then set
the parameter again.
The SERVOPACK may be faulty.
Repair or replace the SERVO-
PACK.
Reconsider the method of writing
parameters.
Take countermeasures against
noise.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Write the parameter of another
SERVOPACK of the same model
with the same software version.
Then turn the power OFF and then
ON again.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
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