cedax Posted December 13, 2010 Report Share Posted December 13, 2010 Hi everyone I need to drive an 24vdc motor (3A) and modify the speed. I thought of using the PWM output attached to a solid state relay. It 's the right way or have any suggestions? Thanks Quote Link to comment Share on other sites More sharing options...
MVP 2014 Simon Posted December 13, 2010 MVP 2014 Report Share Posted December 13, 2010 In general terms that is the right approach. I have a small fan at my desk running directly off the PWM output, with speed varied by temperature. Had to juggle the frequency - too high and it made a terrible noice, to low and it shuddered. If the pump won't be near people, the whining of the PWM should not be a problem. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted December 17, 2010 MVP 2023 Report Share Posted December 17, 2010 I have done this, and the PWM output works well. I found a frequency setting of 100 worked in my application. Also remember that the Duty Cycle goes from 0 - 1000. Make sure you use a DC SSR, such as a Crydom D1D20. I realize this is a 20A relay, but it's only $10 more than the 7A unit and you get a lot more wiggle room. You won't need a heat sink at this low current. Joe T. Quote Link to comment Share on other sites More sharing options...
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