YASKAWA Sigma-7 SGD7S Series - Page 612

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
An error occurred in
reading data from the
linear encoder.
– The linear encoder is
not mounted within
an appropriate toler-
ance. Correct the
mounting of the
linear encoder.
–
Excessive speed
occurred in the linear
encoder.
– Control the motor
speed within the
range specified by
the linear encoder
manufacturer and
then turn ON the
control power supply.
–
The encoder malfunc-
tioned due to noise.
– Correct the wiring
around the encoder
by separating the
Encoder Cable from
the Servomotor Main
Circuit Cable or by
grounding the
encoder.
–
The polarity sensor is
not wired correctly.
Check the wiring of
the polarity sensor.
Correct the wiring of
the polarity sensor.
–
The polarity sensor
failed.
– Replace the polarity
sensor.
–
A.850
(1850h)
Encoder Over-
speed
(Detected at the
encoder when
the control
power supply is
turned ON.)
Rotary Servomotor:
The Servomotor
speed was 200 min
-1
or higher when the
control power supply
was turned ON.
Check the motor
speed when the
power supply is
turned ON.
Reduce the Servo-
motor speed to a
value less than 200
min
-1
, and turn ON
the control power
supply.
–
Linear Servomotor:
The Servomotor
exceeded the speci-
fied speed when the
control power supply
was turned ON.
Control the motor
speed within the
range specified by
the linear encoder
manufacturer and
then turn ON the
control power supply.
–
A failure occurred in
the encoder.
– Turn the power
supply to the SER-
VOPACK OFF and
ON again. If an
alarm still occurs, the
Servomotor or linear
encoder may be
faulty. Replace the
Servomotor or linear
encoder.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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