Differences

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--- mycnc:mycnc_et7 [2020/04/27 12:00] – ivan
+++ mycnc:mycnc_et7 [2021/05/10 16:46] – ivan
@@ Line 12: / Line 12: @@
 | DAC output | 1x - 0...10V (for spindle speed control and relative applications)|
 | RS485/RS422 | 1x RS422 full duplex serial communication OR 2x RS485 half-duplex serial communication |
-| External operator panel connector | up to 25 external keys,  up to 2 rotary encodersup to 2 double-axes joysticks OR
+| External operator panel connector | up to 25 external keys,  up to 2 rotary encodersup to 2 double-axes joysticks OR up to 4 potentiometers (shared with 4x ADC inputs) |
-up to 4 potentiometers (shared with 4x ADC inputs) |
 | Power supply outputs for control computer | 2x DC-DC converters 5V 1.5A |
@@ Line 25: / Line 24: @@
 Power Supply 24V DC and +24V and GND pins are shown on a picture below.
-{{hardware:et7:et7-power-connection-001.jpg}}
+{{:mycnc:et7-power-connection-003.jpg}}
+//NOTE: Depending on the board revision version, the +5/+5V power supply in the top left corner may actually be
+a +5/+12V power supply (on older boards).//
 ==== Pulse-Dir outputs ====
@@ Line 111: / Line 112: @@
 {{hardware:et7:et7-encoder-inputs.png}}
-Encoder inputs connector pinout is shown on a picture
+Encoder inputs connector pinout is shown in the diagram below:
-{{hardware:et7:et7-encoder-inputs-connection-001.jpg}}
+{{:mycnc:et7-encoder-inputs-connection-003.jpg}}
+//NOTE: Depending on the board revision version, the +5/+5V power supply in the top left corner may actually be
+a +5/+12V power supply (on older boards).//
@@ Line 120: / Line 124: @@
 myCNC-ET7 controller has 8 ADC inputs.
   * 6 ADC inputs 0-5V range
-  * 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**.
+  * 2 ADC inputs with galvanic isolation for save and convenient connection of Arc Voltage signal from Power station. Galvanic isolated ADC inputs ADC01 are 0..12V, so High Voltage Arc signal **CANNOT** be connected directly to ADC inputs, **voltage divider is NEEDED**.
 The 0-5 V ADC inputs schematic is shown below:
@@ Line 133: / Line 137: @@
 {{:hardware:et7:et7-b-adc-connection-001.jpg}}
-Non-isolated ADC inputs have a 0...5V Range. Connector with non-isolated ADC inputs also has the GND and +5V DC output pins for convenient potentiometer connection. Picture below shows an  example for potentiometer connected to ADC2 input.
+Non-isolated ADC inputs (ADC0, ADC2-ADC7) have a 0...5V Range. Connector with non-isolated ADC inputs also has the GND and +5V DC output pins for convenient potentiometer connection. Picture below shows an  example for potentiometer connected to ADC2 input.
 {{:hardware:et7:et7-b-adc-connection-002.jpg}}
 <code>WARNING: The names for the ADC inputs printed at the bottom of the board are NOT correct.
+The silk printing naming for inputs ADC0 and ADC01 are switched.
 Please consult the above schematics for the ADC0/ADC1 input locations.</code>
+A voltage divider can be used for plasma cutting arc. In the range of 0-300V, a voltage divider with a 1:25 ratio may be used (a 1:20 ratio can be used for voltages up to 240V). An example diagram for voltage divider connection is available below:
+{{:mycnc:et7-b-adc-connection-003-voltage-divider.jpg}}
+For example, using the standard //Vout=Vin*(R2/[R1+R2])// formula, we can see that for a 1:20 ratio, the resistors must be selected in such a way as to achieve a R1=19*R2 ratio.
+Similarly, for ADC0 (with a range of 0-5V), a voltage divider with a 1:50 ratio is required (for voltages up to 300V). On older models of the myCNC-ET7 controller (prior to 2020), the range on the ADC0 inputs was similarly 0-12V, however due to user convenience the two ADC ports can now be used for a variety of power sources and voltage dividers.
 ==== Jumpers J1, J2, J3 and J4 ====