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9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-6
9.1.2 Troubleshooting of Alarms
If an error occurs in servo drives, an alarm display such as A. and CPF will appear on the panel
operator.
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 s
olved by the described corrective action.
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
A.020:
Parameter Checksum
Error 1
(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 set Fn005
to initialize the parameter.
The power supply went OFF
while
changing a parameter set-
ting.
Check the circumstances when the
po
wer supply went OFF.
Set Fn005 to initialize the parameter
and then set the parameter again.
The number of times that parame-
ters were written exceeded the
li
mit.
Check to see if the parameters were
fr
equently changed through the host
controller.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
Reconsider the method of writing
para
meters.
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.
A SERVOPACK fault occurred.
Turn the power supply ON and OFF
several times. If the alarm still
occurs, the SERVOPACK may be
faulty.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.021:
Parameter Format Er-
ror 1
(The parameter data in
the SER
VOPACK is
incorrect.)
The software version of SERVO-
PACK that caused the alarm is
o
lder than that of the written
parameter.
Check Fn012 to see if the set soft-
ware version agrees with that of the
SERVOPACK. If not, an alarm may
occur.
Write the parameter of another
S
ERVOPACK of the same model
with the same software version.
Then turn the power OFF and then
ON again.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.022:
System Checksum Er-
ror 1
(The parameter data in
the SER
VOPACK 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
whi
le setting an utility function.
Check the circumstances when the
power supply went OFF.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A SERVOPACK fault occurred.
Turn the power supply ON and OFF
se
veral times. If the alarm still
occurs, the SERVOPACK may be
faulty.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.030:
Main Circuit Detector
Error
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.040:
Parameter Setting Er-
ror 1
(The parameter setting
was o
ut of the setting
range.)
The SERVOPACK and servomo-
tor capacities do not match each
other.
Check the combination of SERVO-
PACK and servomotor capacities.
Select the proper combination of
SER
VOPACK and servomotor
capacities.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
The parameter setting is out of
the setting range.
Check the setting ranges of the
pa
rameters that have been changed.
Set the parameter to a value within
the setting range.
The electronic gear ratio is out of
the setting range.
Check the electronic gear ratio. The
ra
tio must satisfy:
0.001< (Pn20E/Pn210) < 4000.
Set the electronic gear ratio in the
range: 0.0
01< (Pn20E/Pn210)
< 4000.
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