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Alarm Number:
Possible Cause
Alarm Name
The encoder malfunc-
tioned.
An error occurred in
reading data from the
linear encoder.
A.840:
Encoder Data
Excessive speed
Alarm (Detected
occurred in the linear
at the encoder.)
encoder.
The encoder malfunc-
tioned due to noise.
The polarity sensor is
not wired correctly.
The polarity sensor
failed.
Rotary Servomotor:
The Servomotor
speed was 200 min
or higher when the
control power supply
was turned ON.
Linear Servomotor:
The Servomotor
exceeded the speci-
fied speed when the
control power supply
A.850:
was turned ON.
Encoder Over-
speed (Detected
at the encoder
when the control
A failure occurred in
power supply is
the encoder.
turned ON.)
A failure occurred in
the SERVOPACK.
Confirmation
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–
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Check the wiring of the
polarity sensor.
–
Check the motor speed
-1
when the power supply
is turned ON.
Check the motor speed
when the power supply
is turned ON.
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12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Continued from previous page.
Correction
for Correc-
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.
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
-1
200 min
, and turn ON
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 Servomotor
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 SERVO-
PACK.
Reference
tion
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12
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12-25
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Table of Contents
Troubleshooting
