YASKAWA SGD7S series Product Manual page 175
Sigma-7s servopack with
ft/ex specification
for cutting application
feed shaft motor
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Also See for SGD7S series:
- Product manual (629 pages) ,
- Selection manual (337 pages) ,
- Product manual (473 pages)
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9.1 Alarm Displays
9.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.840:
Encoder Data
Alarm
(Detected at the
encoder.)
A.850:
Encoder Over-
speed
(Detected at the
encoder when
the control power
supply is turned
ON.)
9-22
Possible Cause
The encoder malfunc-
–
tioned.
An error occurred in
reading data from the
–
linear encoder.
Excessive speed
occurred in the linear
–
encoder.
The encoder malfunc-
–
tioned due to noise.
The polarity sensor is
Check the wiring of the
not wired correctly.
polarity sensor.
The polarity sensor
–
failed.
Rotary Servomotor:
The Servomotor
Check the motor speed
-1
speed was 200 min
when the power supply
or higher when the
is turned ON.
control power supply
was turned ON.
Linear Servomotor:
The Servomotor
Check the motor speed
exceeded the speci-
when the power supply
fied speed when the
is turned ON.
control power supply
was turned ON.
A failure occurred in
–
the encoder.
A failure occurred in
–
the SERVOPACK.
Confirmation
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
The linear encoder is not
mounted within an appro-
priate tolerance. Correct
the mounting of the linear
encoder.
Control the motor speed
within the range specified
by the linear encoder
manufacturer and then
turn ON the control power
supply.
Correct the wiring around
the encoder by separating
the Encoder Cable from
the Servomotor Main Cir-
cuit Cable or by ground-
ing the encoder.
Correct the wiring of the
polarity sensor.
Replace the polarity sen-
sor.
Reduce the Servomotor
speed to a value less than
200 min
the control power supply.
Control the motor speed
within the range specified
by the linear encoder
manufacturer and then
turn ON the control power
supply.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Continued from previous page.
Correction
Reference
–
–
–
–
–
–
–
-1
, and turn ON
–
–
–
Continued on next page.
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Table of Contents
Troubleshooting
