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
Alarm Name
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:
S
Cn-02 bit 9 = 1
S
Cn-11 (number of encoder pulses)
6
