Okuma Alarm-D 4711 Spindle motor not ready to start
Spindle start command is issued before the spindle drive motors become ready to start. (It takes several seconds for the motors to get ready after power supply or resetting alarm A.)
Probable Faulty Locations
1)Spindle start command is issued within several seconds after power supply or level A alarm reset.
2)A motor drive unit can not send the operation ready signal to the NC because of
-Motor drive unit trouble
Measures to Take
1)After supplying power or resetting a level A alarm, wait for several seconds before issuing a spindle start command.
2)Check if the spindle drive motors properly send the operation ready signal to the NC. If not, check wiring connections and the motor drive unit for defects.