Yaskawa MP940 Reference Manual - Manual (Page 380)

MotionSuite™ MP940 Machine Controller Reference Manual Troubleshooting
10-27
A.C1
A.C1 is the alarm display for servo overrun. The alarm output appears
below.
Note: The indicates the output transistor is ON; the x indicates the output transistor is OFF
(alarm state).
Status when Alarm Occurred
Alarm Output
Alarm Code Output ALM Output
ALO1 ALO2 ALO3
x x
Cause Remedy
A Mistaken servo motor wiring. Check wiring and connections at
servo motor.
B Mistaken encoder wiring. Check wiring and connections at
encoder.
C Encoder defective. Replace servo motor.
D Circuit board (1PWB) defective. Replace servo amplifier.
Alarm occurs at power ON
User parameter
Pn50A.1 = 7
D
Alarm occurs 1~3 seconds
after power ON
When Pn50A.1 is set
to other than 7
A, B, C, D
Alarm occurs at speed
reference input
A, B, C
Alarm occurs when servo ON
(/SV-ON) signal is ON
A, B, C, D