2 Wiring Board
NCH02 User’s ManualPage -5
The circuit switching wiring board provides screw terminals for power (24VDC), input signals, spindle
control, pulse and direction for X/Y/Z/A/B stepper/ servo drives, MPG, input and output ports as well as an USB
input. Please see the reference picture 2-1 in detail.
Input Ports Output Ports
Spindle Ports
X/Y/Z/A/B Stepper/
Servo Ports
MPG Ports
Power Supply
24VDC
USB Port
Picture 2-1 Wiring Board Rear view
Picture 2-2 Board Power Structure
As the picture shows, the wiring section of the controller has Stepper/Servo Ports,Spindle Control
Ports,MPG ports,Output and Input Ports,and Power supply Ports,as well as USB ports.
The Inside power solution in the field of the Industrial automation is always very complicated, there is a
lot of the GND, now we descript the structure of the power structure as below:
The power structure as the Picture 2-2,main power supply input ,MPG module and Power and USB port
share common GND, stepper control module and Input&Output module and Spindle control module share
common GND, between the two sector there is photoelectric isolation. Inside of the board, there is GND as
common-, no need to connect external power supply.
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