automat_plc Posted February 24, 2012 Report Share Posted February 24, 2012 Please few advices... i use V130-33-T30 and PWM output. My main voltage is 24 Vdc, and i need 50% of the main voltage = 12 Vdc output for LED, just for test PWM. So i use PWM output O0 with next parameters: Frequency 50Hz(20msec), so i use MI0=8 ( 8 x base 2.5msec = 20 msec) Duty Cycle 50%, so i use MI1=500 ( 500 x base 0.1% = 50 %) Run = MB0 So when i set MB=1, i get unstable output from 10.9V to 12.8V, it is not a constant output voltage, it is very unstable. Am i doing something wrong , or ...?? Please, any advice will be very helpfull!! Thank You very much, best regards! Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted February 25, 2012 MVP 2023 Report Share Posted February 25, 2012 You're generating an AC signal. The way you get a stable DC signal from an AC signal is to add a filter capacitor and a load resistor. You'll have to play with the values until you get the DC level you want. Do a Google search on "sizing a filter capacitor" for some ideas on the calculations involved. Joe T. Quote Link to comment Share on other sites More sharing options...
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