YASKAWA SGD7S series Product Manual page 504

12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.862:
Overheat Alarm
A.890:
Encoder Scale
Error
A.891:
Encoder Module
Error
A.8A0:
External Encoder
Error
A.8A1:
External Encoder
Module Error
A.8A2:
External Incre-
mental Encoder
Sensor Error
A.8A3:
External Abso-
lute Encoder
Position Error
12-28
Possible Cause
Check the surrounding
The surrounding tem-
temperature using a
perature is too high.
thermostat.
The overheat protec-
tion input signal line is Check the input voltage
disconnected or with Un02F.
short-circuited.
An overload alarm
Check the alarm display
was reset by turning
to see if there is an
OFF the power sup-
overload alarm.
ply too many times.
Operation was per- Use the accumulated
formed under an load ratio to check the
excessive load. load during operation.
A failure occurred in
–
the SERVOPACK.
The temperature
detection circuit in the
Linear Servomotor is
–
faulty or the sensor
attached to the
machine is faulty.
A failure occurred in
–
the linear encoder.
A failure occurred in
–
the linear encoder.
Setting the origin of Before you set the ori-
the absolute linear gin, use the fully-closed
encoder failed feedback pulse counter
because the motor to confirm that the
moved. motor is not moving.
A failure occurred in
–
the external encoder.
A failure occurred in
–
the external encoder.
A failure occurred in
the Serial Converter –
Unit.
A failure occurred in
–
the external encoder.
A failure occurred in
the external absolute –
encoder.
Confirmation
Lower the surrounding
temperature by improving
the installation conditions
of the Linear Servomotor
or the machine.
Repair the line for the
overheat protection input
signal.
Change the method for
resetting the alarm.
Reconsider the load and
operating conditions.
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
The temperature detec-
tion circuit in the Linear
Servomotor may be faulty
or the sensor attached to
the machine may be
faulty. Replace the Linear
Servomotor or repair the
sensor attached to the
machine.
The linear encoder may
be faulty. Replace the lin-
ear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the linear encoder
may be faulty. Replace the
linear encoder.
The motor must be
stopped while setting the
origin position.
Replace the external
encoder.
Replace the external
encoder.
Replace the Serial Con-
verter Unit.
Replace the external
encoder.
The external absolute
encoder may be faulty.
Refer to the encoder
manufacturer's instruc-
tion manual for correc-
tions.
Continued from previous page.
Correction Reference
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page 5-54
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