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C11- MULTIFUNCTION CNC BOARD Rev. 9.3 - Stepper Motor ...

C11- MULTIFUNCTION CNC BOARD Rev. 9.3 - Stepper Motor ...

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<strong>C11</strong> (<strong>Rev</strong>. <strong>9.3</strong>) User ManualCalculating the R1 value.Note: Rx is the unknown resistor value.R X = V EX .(R/V) - R (1)Where:V EX is the external power supply voltageV is the voltage across the R resistorAn external resistor and a voltmeter are required to calculate the internal resistor (Rx)value.Note. The user should know the R value to do this operation. A 4.7KOhm @ 1/2W isrecommended.SAMPLE: if you are using a 12V power supply (V EX ), and using a 4.7KOhm asexternal resistor (R), then the voltage across R should be 6V, using the equation 1,the Rx value is 4.7KOhm.5.3 Connecting PNP sensors.<strong>Rev</strong>ision: 01/27/2010 http://cnc4pc.com/TechDocs/<strong>C11</strong>R9_3_User_Manual.pdf 11/22

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