YASKAWA SGDA series

6.2Troubleshooting
361
Cause Remedy
A Servomotor wiring incorrect or
disconnected
Check wiring and connectors at
servomotor.
B Encoder wiring incorrect or disconnected Check wiring and connectors at encoder.
C Incremental encoder power not supplied
from Servopack.
Use the Servopack power supply for the
encoder.
D Encoder defective Replace servomotor.
E Circuit board (1PWB) defective Replace Servopack.
Display and Outputs
Digital Operator
Di l
d
Alarm Output
g
p
Display and
Alarm
Name
Alarm Code Output
Alarm Output
Al
arm
N
ame
ALO1 ALO2 ALO3
p
A.C2
Encoder phase
detection error
ON OFF ON OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
D
At power ON
During servomotor
operation
A
,
B
,
C
,D
Occurred 1 to 3 seconds
after power ON
A
,
B
,
C
,D
Cause Remedy
A Noise in encoder wiring. Separate encoder wiring from main wiring
circuits.
B Encoder wiring incorrect or poor
connection
Check wiring and connectors at encoder .
C Encoder defective Replace servomotor.
D Circuit board (1PWB) defective Replace Servopack.
6