Yaskawa MP940 Reference Manual - Manual (Page 385)

Troubleshooting MotionSuite™ MP940 Machine Controller Reference Manual
10-32
A.d0
A.d0 is the alarm display for position deviation pulse overflow. 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 and correct the wiring.
B Poor servo amplifier tuning. Raise the speed loop gain (Pn100) and
position loop gain (Pn102).
C Excessive motor load. Reduce load torque and inertia. Other-
wise replace with larger capacity servo
motor.
D Position reference pulse fre-
quency too high. Slow-up or slow-down the reference
pulse frequency.
Install the smoothing function.
Review the electronic gear ratio.
E Circuit board (1PWB) defective. Replace servo amplifier.
Alarm occurs at power ON E
Alarm occurs during motor
operation
Overflow occurs at
high speed
A
Command pulse
enters, but no
feedback pulse is
returned
E
Operation is normal,
but long commands
result in overflow B, C, D