YASKAWA SGD7S series Product Manual page 182

Alarm Number:
Possible Cause
Alarm Name
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-
drops or cutting oil, or
nications Error
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.
Confirmation
Reconnect the encoder
Check the condition of
connector and check the
the encoder connector.
encoder wiring.
Use the Encoder Cable
Check the condition of
within the specified speci-
the Encoder Cable.
fications.
Improve the operating
environmental, and
Check the operating
replace the cable. If the
environment.
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 condition of Check the Encoder Cable
the Encoder Cable and to see if it is installed cor-
connectors. rectly.
Check the installation Confirm that there is no
condition of the surge voltage on the
Encoder Cable. Encoder Cable.
Properly ground the
Check the installation
machine to separate it
condition of the
from the FG of the
Encoder Cable.
encoder.
9.1 Alarm Displays
9.1.2 Troubleshooting Alarms
Continued from previous page.
Correction Reference
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