6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
6-19
A.820:
Encoder Check-
sum Alarm
(Detected at the
encoder.)
A failure occurred in
the encoder.
–
When Using an Abso-
lute Encoder
Set up the encoder again.
If the alarm still occurs,
the Servomotor may be
faulty. Replace the Servo-
motor.
When Using a Single-
turn Absolute Encoder
or Incremental Encoder
• The Servomotor may be
faulty. Replace the Ser-
vomotor.
• The linear encoder may
be faulty. Replace the
linear encoder.
*1
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
–
A.830:
Encoder Battery
Alarm
(The absolute
encoder battery
voltage was lower
than the speci-
fied level.)
The battery connec-
tion is faulty or a bat-
tery is not connected.
Check the battery con-
nection.
Correct the battery con-
nection.
*1
The battery voltage is
lower than the speci-
fied value (2.7 V).
Measure the battery
voltage.
Replace the battery.
*1
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
–
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 the alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor 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.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction Reference
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