High Speed Outputs Pulse-Width Modulation (PWM) Output The pulse output of the Micro PLC can also serve as a PWM output PWM as Analog Voltage Output port. Pulse-Width Modulation (PWM) is a highly efficient and convenient Rievtech Micro PLC Low-cost analog output Inverter way of controlling output voltage to devices with large time constant, R1 such as controlling the speed of a DC motor, the power to a heating + - DC 12-24V C1 element, light brightness control or the position of a proportional Com PWM Output valve.
PWM works by first turning the output to full voltage for a short while and then shutting it off for another short while and then Vin GND turning it on again and so on in accurate time intervals. Width of pulse (a) The advantage of using PWM is that you can easily amplify the Width of pause (b) drive current to a larger load such as larger permanent magnet DC V full motor by using low cost DC Solid-State Relays (SSR) to boost the current switching capability. Using SSR has the added advantage Avarage voltage a + b x V full a of isolating the CPU from the high current load. Modulation period The speed can be controlled by changing the pulse width of the PWM output.
Cutter Encoder The output can also serve as an analog voltage output when a smoothing capacitor is inserted in the circuit. One of the application examples such an analog voltage output is an inverter speed control. Motor Inverter 13