3.5 FT83 SERVOPACKs with Analog Voltage/Pulse Train References
3.5.3 Troubleshooting Alarms
3-222
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
may be faulty. Replace the
Servomotor.
–
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.
–
A.850:
Encoder Over-
speed
(Detected at the
encoder when
the control power
supply is turned
ON.)
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.
–
A failure occurred in
the encoder.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor
may be faulty. Replace the
Servomotor.
–
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
SERVOPACK.
–
A.860:
Encoder Over-
heated
(Detected at the
encoder.)
The surrounding air
temperature around
the Servomotor is too
high.
Measure the surround-
ing air temperature
around the Servomotor.
Reduce the surrounding
air temperature of the
Servomotor to 40
°
C or
less.
–
The Servomotor load
is greater than the
rated load.
Use the accumulated
load ratio to check the
load.
Operate the Servo Drive
so that the motor load
remains within the speci-
fied range.
*1
A failure occurred in
the encoder.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor
may be faulty. Replace the
Servomotor.
–
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
SERVOPACK.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause
Confirmation
Correction
Reference