YASKAWA Sigma-7 Series Product Manual page 107
Ac servo drive
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Also See for Sigma-7 Series:
- Technical supplement (622 pages) ,
- Product manual (187 pages)
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Alarm Number:
Possible Cause
Alarm Name
A failure occurred in
A.820:
the encoder.
Encoder Check-
sum Alarm
(Detected at the
encoder.)
A failure occurred in
the SERVOPACK.
The battery connec-
A.830:
tion is faulty or a bat-
Encoder Battery
tery is not connected.
Alarm
The battery voltage is
(The absolute
lower than the speci-
encoder battery
fied value (2.7 V).
voltage was lower
than the speci-
A failure occurred in
fied level.)
the SERVOPACK.
The encoder malfunc-
tioned.
An error occurred in
reading data from the
linear encoder.
A.840:
Encoder Data
Excessive speed
Alarm
occurred in the linear
(Detected at the
encoder.
encoder.)
The encoder malfunc-
tioned due to noise.
The polarity sensor is
not wired correctly.
The polarity sensor
failed.
Confirmation
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.
The SERVOPACK may be
–
faulty. Replace the
SERVOPACK.
Check the battery con-
Correct the battery con-
nection.
nection.
Measure the battery
Replace the battery.
voltage.
The SERVOPACK may be
–
faulty. Replace the
SERVOPACK.
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.
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.
Check the wiring of the
Correct the wiring of the
polarity sensor.
polarity sensor.
Replace the polarity sen-
–
sor.
6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
Continued from previous page.
Correction
Reference
*1
–
*1
*1
–
–
–
–
–
–
–
Continued on next page.
6
6-19
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Table of Contents
Troubleshooting
