Hi,
I want to control the power of mains voltage heating elements with arduino. The total power of the heating elements is 12kW.
At first i decided to make a three phase SSR with optrons and TRIACs because it is cheaper but now i think to skip this part and directly buy Commercial 3Phase SSR - at least it is designed professionally.
I'm currently looking at this SSR
https://www.tme.eu/Document/5bcacf8879a7a0f54111a99faa335ecc/SR3-series.pdf with Zero Cross Turn-On.
With rough calculations the load current will be 12 000W / 220V = 55A or ~19A per phase - connected in Y configuration.
1. My first question is if the given rated Amps are for the whole SSR or for 1 phase (1 triac)?
I suppose the given Amps are the total load current because otherwise it would be written "load current per phase" ... or something like that in the datasheet.
2. Is it a problem to control it directly from the arduino pin without any additional components?
I see the input of the SSR is into an optron so there will be galvanic isolation between the arduino and the power circuit.
Arduino output is 5V which is in the 4-30VDC limit of the SSR Input.
3. The arduino will be about 3-4m away from the SSR.
Is it a problem for the 5V control signal from arduino?
4. What control interval (On/Off) will be OK?
I'm thinking of 1 second interval. e.g. 10% power = 0.1s on / 0.9s off or 90% power = 0.9 on / 0.1s off
Maybe to increase it? But lower than that i think won't be ok because the zero cross turn-on of the optron is not synchronized with the arduino output signal.
I apologize if some of the questions seems stupid to you.
I appreciate every answers / suggestions.