Yaskawa MP940 Reference Manual - Manual (Page 368)

MotionSuite™ MP940 Machine Controller Reference Manual Troubleshooting
10-15
A.73
A.73 is the alarm display DB (dynamic brake) overload. 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
Cause Remedy
A The product of the motor speed × 2
divided by the combined inertia of
motor and load (rotational energy) is
greater than the capacity that can be
processed by the dynamic braking
(DB) resistor in the servo amplifier. Lower the speed
Decrease the load inertia
Do not frequently use dynamic
braking
B Circuit board (1PWB) defective. Replace servo amplifier.
Alarm occurs when the servo
is turned OFF during motor
operation
A Alarm occurs at power ON B