YASKAWA SGM-A3 - Page 416

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
404
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.C2
Encoder phase
detection error
Incremental
encoder initial
pulse error
ON OFF ON OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
During servomotor
operation
A
,
B
,
C
At control power ON
During servomotor
operation
Occurred 1 to 3 seconds
after control power ON
D, E
,
F, G ,
H
E, F, G,
H
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 Noise in encoder wiring. Separate encoder wiring from main wiring
circuits.
E Encoder wiring incorrect or poor
connection
Check wiring and connectors at encoder.
F Encoder defective Replace servomotor.
G Absolute encoder is used. Set the following user constants as
follows:
SCn-02 bit 9 = 1
SCn-11 (number of encoder pulses)
6