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Collision detection function quickly detects a collision of the motor shaft, and decelerates and stops the 

motor. This suppresses the generation of an excessive torque in the machine tool, and helps to prevent an 

abnormal state from occurring.Impact at a collision will not be prevented by using this collision detection 

function, so this function does not necessarily guarantee that the machine tool will not be damaged or that 

the machine accuracy will be maintained after a collision.

The same caution as during regular operation is required to prevent the machine from colliding.

This function is aimed at allowing a safety access to the machine's working part by opening the protection 

door, etc. without shutting the power for saving the setup time.

Both the NC control system and drive system (servo and spindle drive units) doubly observe the axis feed 

rate so that it will not exceed the safety speed. If it exceeds the set safety speed, emergency stop occurs 

and the power is shut OFF.

 

Collision detection function outline

 

(a) A collision of machine is detected. 

(b) A retracting torque is generated. 

The collision of machine is reduced. 

Motor detector

Current 

command

Speed F/B

Drive CPU

NC CPU

FB speed observation

FB speed observation

Command speed 

observation

Command speed 

observation

Speed observation

Speed observation

Servo control

Position

speed

command