User`s Manual Template
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1. C NIC4Ppc Integration Solutions for CNC Projects REPLACING A POTENTIOMETER Replacing a Potentiometer This circuit can be used to replace a potentiometer of DC motor speed control circuits This speed controller circuits are very commonly used by SIEG KB Electronics and many other oriental machines Before explaining how to do it please first keep in mind that it can be done if the voltage that goes though the pot is 12vdc or less This circuit cannot be used for AC currents In most cases the terminals that go to the potentiometer will carry these signals R REF VOLT GND WIPER P1 GND A P2 WIPER P3 REFERENCE VOLTAGE User s Manual Page 1 These are the steps for replacing a potentiometer 1 Measure the voltage difference between P1 and P3 Make sure it measures under 12vdc 2 Fine tune the analog output to the output voltage you got from step 1 3 Connect the ground from the analog output to the ground of the potentiometer P1 4 Connect the analog output to the wiper connection of the potentiometer P2 After configuring the Mach these steps should be followed Step 1 Ensure that all external power sources are set to OFF Step 2 Connect the power supply to the Power Inputs Connectors X1 Step 3 Turn on the external supplies Step 4 Connect a multimeter in the analog outputs connectors X2 and make and fine tune this output Make sure that when you reach the max speed in the co2. ntrol software you get 10VDC out X2 This voltage can vary depending on many things including the electrical properties of parallel port or breakout board you are using the length of the step pulse your software is delivering and the normal hi or low status of your step pin Play with the pot hi low status of the pin and pulse length to fine tune the output voltage Analog Output Tunning Potentiometer X3 Analog Output Connectors X2 Power Connectors X1 Disclaimer Use caution CNC machines can be dangerous machines Neither DUNCAN USA LLC nor Arturo Duncan are liable for any accidents resulting from the improper use of these devices This product is not a fail safe device and it should not be used in life support systems or in other devices where its failure or possible erratic operation could cause property damage bodily injury or loss of life User s Manual Page 2
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