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Greetings to the List and happy holidays.... This forum is fantastic and I appreciate the knowledge and wisdom of everyone here.
First let me say that I fully understand the consequences of screwing with electricity and that now matter what experience I may think I have, one wrong move could end in disastrous consequences. I have also read and understand the disclaimer in the terms of service. Anyone that uses these diagrams should know that too.
I am planning to build a modular controller - for me it would include three of the following schematics but depending upon the size of the boiler and available power it could have any number. I am also hoping it would work on any single phase power source. I am building for 220v 50hz but sometimes i will take the unit to 110/60hz. I understand that voltage reduction from 220 to 110 will reduce my heating power because of V=I*R. That's all good because i have a smaller boiler on the 110v side of the atlantic and I have checked the volume heat equations and am happy with the time to boil. What I am not sure about is the consequences for the SSR and using PWM to adjust my elements with 50 vs 60hZ. This is my first question, what can I expect with the same SSRs in different frequencies?
The design takes Cotherman's PWM ideas from another and adds a couple relays to choose between the element control source.
Not shown here is the main breaker in the box sized for the total load and individual GFCI's sized for each element. Neither is my PID which is in another box currently. The main part of the panel is the 4 way switch, shown here as each individual single pole single throw. Each of these selections then will allow me to close a contactor which either
Well everything was fine with this design and I had a cheap 110-240v 12v power supply but then I found a lot of 30A schneider contactors on ebay for 10$ each... They required a 24v control source, so now I need to adjust the voltage to the PWM module as well replace C1 with a 2.2uF capacitor. I just dont want to have too many voltages in the box if I dont need to.
Here is a detail of the PWM with voltage regulation...
So here are my questions...
I'm sorry if these questions are irrelevant or foolish,
Thanks in advance for your input.