Yaskawa Sigma Mini - Manual (Page 228)

INSPECTION AND MAINTENANCE
5.2.1 Troubleshooting Problems with Alarm Display
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Status when Alarm Occurred
B
,
D
At power ON During Servomotor
operation
A
,
B
,
C
Cause Remedy
A Servopack miscounted pulses or
malfunctioned due to noise.
Separate encoder wiring from main wiring
circuits turn ON Servopack power again.
B Incorrect encoder wiring or poor
connection.
Check the encoder wiring and connectors
at encoder.
C Encoder malfunctioned. Replace Servopack.
D Circuit board (1PWB) defective. Replace Servopack.
8. A.b1
Display and Outputs
Digital Operator Display Alarm Name Alarm Output
A.b1 Reference input read error (for
speed/torque control only)
Output transistor is OFF
(alarm state)
Status when Alarm Occurred
A
,
B
During Servomotor
operation
At power ON
C
Cause Remedy
A Part malfunctioned in reference read-in
unit (A/D converter, etc.).
Reset alarm and restart operation.
B Part defective in reference read-in unit
(A/D converter, etc.).
Replace Servopack.
C Circuit board (1PWB) defective Replace Servopack.
9. A.C1
Display and Outputs
Digital Operator Display Alarm Name Alarm Output
A.C1 Servo overrun Output transistor is OFF
(alarm state)
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