YASKAWA SGM7D-30F Product Manual page 188

Alarm Number:
Possible Cause
Alarm Name
A failure occurred in
the encoder.
A.C80:
Encoder Clear
Error or Multiturn
Limit Setting Error
A failure occurred in
the SERVOPACK.
There is a faulty con-
tact in the connector
or the connector is
not wired correctly for
the encoder.
There is a cable dis-
connection or short-
circuit in the encoder.
Or, the cable imped-
ance is outside the
specified values.
One of the following
has occurred: corro-
sion caused by
improper tempera-
ture, humidity, or gas,
A.C90:
a short-circuit caused
by entry of water
Encoder Commu-
nications Error drops or cutting oil, or
faulty contact in con-
nector caused by
vibration.
A malfunction was
caused by noise.
A failure occurred in
the SERVOPACK.
Noise entered on the
signal lines because
the Encoder Cable is
bent or the sheath is
damaged.
A.C91: The Encoder Cable is
bundled with a high-
Encoder Commu-
current line or
nications Posi-
installed near a high-
tion Data
current line.
Acceleration Rate
Error
There is variation in
the FG potential
because of the influ-
ence of machines on
the Servomotor side,
such as a welder.
3.3 FT82 SERVOPACK with MECHATROLINK-III Communications References
Confirmation
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–
Check the condition of
the encoder connector.
Check the condition of
the Encoder Cable.
Check the operating
environment.
–
–
Check the condition of
the Encoder Cable and
connectors.
Check the installation
condition of the
Encoder Cable.
Check the installation
condition of the
Encoder Cable.
3.3.3 Troubleshooting Alarms
Continued from previous page.
Correction
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor
may be faulty. Replace the
Servomotor.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Reconnect the encoder
connector and check the
encoder wiring.
Use the Encoder Cable
within the specified speci-
fications.
Improve the operating
environmental, and
replace the cable. If the
alarm still occurs, replace
the SERVOPACK.
Correct the wiring around
the encoder by separating
the Encoder Cable from
the Servomotor Main Cir-
cuit Cable or by ground-
ing the encoder.
Connect the Servomotor
to another SERVOPACK,
and turn ON the control
power supply. If no alarm
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Check the Encoder Cable
to see if it is installed cor-
rectly.
Confirm that there is no
surge voltage on the
Encoder Cable.
Properly ground the
machine to separate it
from the FG of the
encoder.
Continued on next page.
Reference
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*1
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*1
*1
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*1
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3
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3-119