YASKAWA SGM-A3 User Manual page 416

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
6
404
D Display and Outputs
Digital Operator g p
Di Display and l d
Alarm Name Alarm Name
ALO1
A.C2
ON
Encoder phase
detection error
Incremental
encoder initial
pulse error
Status When Alarm Occurred
During servomotor
operation
At control power ON
Cause
A Noise in encoder wiring.
B Encoder wiring incorrect or poor
connection
C Encoder defective
D Noise in encoder wiring.
E Encoder wiring incorrect or poor
connection
F Encoder defective
G Absolute encoder is used.
Alarm Output
Alarm Code Output
ALO2
OFF ON
Occurred 1 to 3 seconds
A B C
after control power ON
, ,
During servomotor
D, E, F, G,
H
operation
Separate encoder wiring from main wiring
circuits.
Check wiring and connectors at encoder.
Replace servomotor.
Separate encoder wiring from main wiring
circuits.
Check wiring and connectors at encoder.
Replace servomotor.
Set the following user constants as
follows:
SCn-02 bit 9 = 1
SCn-11 (number of encoder pulses)
Alarm Output p
ALO3
OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
E, F, G,
H
Remedy