Yaskawa MP940 - Manual (Page 389)

SERVOPACK Inspection, Maintenance, and Troubleshooting
10.2.1 Troubleshooting Problems with Alarm Displays
10-22
Status and Remedy for Alarm
„ A.C1
A.C1: Servo Overrun
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
Cause Remedy
A Error in reference read-in unit (A/D
Converter, etc.). Reset alarm and restart operation.
B Reference read-in unit faulty (A/D
Converter, etc.). Replace SERVOPACK.
C Circuit board (1PWB) defective. Replace SERVOPACK.
Alarm Outputs
Alarm Code Outputs
ALM Output
ALO1 ALO2 ALO3
ON OFF ON OFF
Cause Remedy
A Servomotor wiring incorrect or dis-
connected. Check wiring and connectors at servomo-
tor.
B Encoder wiring incorrect or discon-
nected. Check wiring and connectors at encoder.
C Encoder defective. Replace servomotor.
D Circuit board (1PWB) defective. Replace SERVOPACK.
C A,B
During servomotor
operation
At power ON
D
A,B,C,D
A,B,C
A,B,C,D
At power ON
Parameter
Pn50A.1 = 7
Occurred 1 to 3 seconds
after power ON
Parameter
Pn50A.1 = Other
than “7"
When servo ON (/S-ON)
signal turned ON
On speed reference input