YASKAWA Sigma Mini SGMM Series User Manual page 231

INSPECTION AND MAINTENANCE
5.2.1 Troubleshooting Problems with Alarm Display
11.A.C3
5
12.A.C4
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Display and Outputs
Digital Operator Display
A.C3 Encoder phase-A, -B
discontinuity
Status when Alarm Occurred
At power ON
Parameter
D
Cn-01 bit 0 = 0
1 to 3 seconds after
power ON
Parameter
A
Cn-01 bit 0 = 1
Cause
A Encoder wiring incorrect or poor
connection.
B Noise in encoder wiring.
C Encoder defective.
D Circuit board (1PWB) defective.
Display and Outputs
Digital Operator Display
A.C4 Encoder phase-C discontinuity
Status when Alarm Occurred
At power ON
Parameter
C
Cn-01 bit 0 = 0
1 to 3 seconds after pow-
er ON
Parameter
A
Cn-01 bit 0 = 1
— 5-10 —
Alarm Name
Output transistor is OFF
(alarm state)
When servo ON (/S-ON)
signal turned ON
During Servomotor
operation
, B, C
Check wiring and connectors at encoder.
Separate encoder wiring from main wiring
circuits.
Replace Servomotor.
Replace Servopack.
Alarm Name
Output transistor is OFF
(alarm state)
When servo ON (/S-ON)
signal turned ON
During Servomotor
operation
, B, C, D
Alarm Output
A
, B, C, D
A, B, C, D
Remedy
Alarm Output
A
, B, C, D
A, B, C, D