Note that the typical SSR doesn't turn off when you tell it to, it turns off at the next zero crossing after that. So yes, for good/fast control with a SSR you need to sync your turn on times with a zero crossing. Or use something like a Crydom D4D07 (expensive) or an IGBT.
Buestad, I love these projects!!!!! I have some power boards from a super automatic espresso machine that are pretty useful. They are a bit big but they offer the following:
High power Triac (up to 1400 watts) 2 Random fire Triacs (to vary power to the vibe pump for presssure profiling) Power supply (8 and 24 volts out) Zero crossing detector (output is 5V pulse directly to arduino)
I am happy to send you a couple of these if you want to use or try them. Just PM me. (JonR, let me know if you want some also).
Just a quick note on SSR's. There are 2 types for this application, zero cross SSR, and Random fire SSR. The zero cross SSR is the one you normally find. These only turn on and off at the zero cross of the AC cycle. These are good for heating elements. The random fire SSR can be turned on any where int he AC cycle, it still turns off only at the zero crossing.
Posted Sat May 3, 2014, 9:11am Subject: Re: "BlueJava": Silvia + Arduino mod
I am interested to know more about high frequency PWM for AC pump control. I have hesitated to try this, probably out of ignorance, over concerns about the noise I would be creating on my AC mains. Have you found this to be an issue?
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