12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
12-25
12
Maintenance
A.840:
Encoder Data
Alarm (Detected
at the encoder.)
The encoder malfunc-
tioned.
–
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 Servomotor
or linear encoder.
–
An error occurred in
reading data from the
linear encoder.
–
The linear encoder is not
mounted within an appro-
priate tolerance.
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 Cir-
cuit Cable or by ground-
ing 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 sen-
sor.
–
A.850:
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 Servomotor
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.
Check the motor speed
when the power supply
is 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 SERVOPACK OFF and
ON again.
If an alarm still occurs, the
Servomotor or linear
encoder may be faulty.
Replace the Servomotor
or linear encoder.
–
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again.
If an alarm still occurs, the
SERVOPACK may be
faulty.
Replace the SERVO-
PACK.
–
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause
Confirmation
Correction
Reference
for Correc-
tion