YASKAWA SGM-A3 - Page 418

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
406
D 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.C4
Encoder C-phase
disconnection
A.C7
External PG
C-phase
disconnection
(only for
full-closed loop
specification)
ON OFF ON OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
C
At main circuit power
ON
User constant
Cn-01 Bit 0 = 0
When servo ON (S-ON)
signal turned ON
A
,B,C,D
During servomotor
operation
A, B, C, D
A
,B,C,D
Occurred 1 to 3 seconds
after main circuit power
ON
User constant
Cn-01 Bit 0 = 1
Cause Remedy
A Encoder wiring incorrect or poor
connection
Check wiring and connectors at encoder.
B Noise in encoder wiring. Separate encoder wiring from main wiring
circuits.
C Encoder defective Replace servomotor.
D Circuit board (1PWB) defective Replace Servopack.
6