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mycnc:mycnc_et7

myCNC-ET7 CNC controller

Power supply connection

myCNC-ET7 control board uses 24VDC . The board contains 4 pins for connection +24V (joined internally) and number of GND pins for convenient connection of external devices. Power Supply 24V DC and +24V and GND pins are shown on a picture below.

Pulse-Dir outputs

ET7 has 6 channel pulse/dir outputs, 3MHz max pulses frequency.

ET7 pulse dir outputs conforms RS422 standard and compatible with most of servo and stepper drivers (line driver with paraphase signals positive and negative polarity). Internal schematic for pulse-dir is shown on a picture below.

Pulse-dir schematic pulse-dir6.jpg

ET7 Output pins

ET7 board contains 19 output pins-

  • 5 relay outputs (OUT#11 … OUT#15)
  • 11 open collector outputs (OUT#0 … OUT#10)
  • 3 PWM outputs (PWM#1, PWM#2, PWM#3)
WARNING: ET7 board rev.1,2 has Output pin names printed on Botton 
side of the board. This names are NOT correct and differ from actual 
output addresses. Please check table below to find out 
actual output address
SILK print Actual Output Pin Address
OUT0 OUT0
OUT1 OUT1
OUT2 OUT2
OUT3 OUT3
OUT4 OUT4
OUT5 OUT5
OUT6 OUT6
OUT7 OUT7
OUT8 OUT8
OUT9 OUT9
OUT10 OUT10
OUT11 PWM1
OUT12 PWM2
OUT13 PWM3
P0A OUT11 (A)
P0B OUT11 (B)
P0C OUT11 (C)
P1A OUT12 (A)
P1B OUT12 (B)
P1C OUT12 (C)
P2A OUT13 (A)
P2B OUT13 (B)
P2C OUT13 (C)
P3A OUT14 (A)
P3B OUT14 (B)
P31 OUT14 (C)
P4A OUT15 (A)
P4B OUT15 (B)
P41 OUT15(C)

Schematic for ET7 inputs & outputs is shown below

Galvanic isolated inputs

ET7 control board has 16 galvanic isolated binary inputs, 4 groups of 4 inputs each. Each group has separate power supply pins so inputs can be powered from different power sources. Using PNP and NPN sensors simultaneously is possible too.

et7-galvanic-isolated-inputs-001.jpg

Connection Examples -

3-wire NPN sensor connection example

Jumpers J1,J2,J3,J4 are open.

3-wire PNP sensor connection example

Jumpers J1,J2,J3,J4 are open.

Switch connection example

Jumper for selected group (one of J1,J2,J3,J4) is closed.

Common wire for 4 optocouple units is connected to internal +24V if Jumper is closed. Switch should short another optocouple input to GND (0V) to activate input pin.

J4 should be closed to connect optocoupe pin to +24V. Switch should short wire to GNC(0V).

Spindle Speed control over DAC (0-10V) output

ADC Inputs

myCNC-ET7 Control board has 2 ADC inputs with galvanic isolation for save and convenient connection of Arc Voltage signal from Power station. Galvanic isolated ADC inputs are 0..10V, so High Voltage Arc signal CANNOT be connected directly to ADC inputs, voltage divider is NEEDED.

Non-isolated ADC inputs have 0…5V Range. Connector with non-isolated ADC inputs has also GND and +5V DC output pins for convenient potentiometer connection. Picture below shows example for potentiometer connected to ADC2 input.

RS422/RS485 Bus

myCNC-ET7 control board has RS422/RS485 bus connector. Modbus ASCII/RTU and Hypertherm Serial communication interfaces are implemented in myCNC-ET7 control board. RS422 connector pinout shown below

Board dimension

ET7 keypad board

We have simple keypad board that can be used with ET7 controller. Keypad board connected to ET7 controller through 20 wires flat cable. Keypad contains 23 keys, 2x rotary encoders and double-axes simple resistive joystick.

PDF: http://cnc42.com/downloads/et7-keypad-dimensions.pdf

DXF: http://cnc42.com/downloads/et7-keypad-dimensions.dxf

Each key, rotary encoder and joystck functions can be programmed in configuration dialogs.

mycnc/mycnc_et7.txt · Last modified: 2017/12/19 14:20 by es