YASKAWA Sigma-7 Series Product Manual page 108

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.850:
Encoder Over-
speed
(Detected at the
encoder when
the control power
supply is turned
ON.)
A.860:
Encoder Over-
heated
(Detected when a
Rotary Servomo-
tor or Absolute
Linear Encoder is
connected.
(Detected at the
encoder.)
6-20
Possible Cause
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.
The surrounding air
Measure the surround-
temperature around
ing air temperature
the Servomotor is too
around the Servomotor.
high.
The Servomotor load Use the accumulated
is greater than the load ratio to check the
rated load. load.
A failure occurred in
–
the encoder.
A failure occurred in
–
the SERVOPACK.
Confirmation
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 the 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 the alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Reduce the surrounding
air temperature of the
Servomotor to 40°C or
less.
Operate the Servo Drive
so that the motor load
remains within the speci-
fied range.
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the Servomotor or
absolute linear encoder
may be faulty. Replace the
Servomotor or absolute
linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Continued from previous page.
Correction Reference
–
-1
, and turn ON
–
–
–
–
*1
–
–
Continued on next page.