Tlas3
Mechanical
- Nov 17, 2006
- 4
I got a question about SCR controllers and I was wondering if anyone could help me out.
I'm trying to control a large resistance heater to high accuracy using an SCR controller. Issues have been raise whether to use the phase angle fired or zero voltage cross.
I'm more inclined to use the phase angle fired because i believe it can reach higher accuracies since zero cross is bound by each period of the 50 sine waves (50hz). However i'm also aware that phase angle fired is predominantly reserved for high response heaters such as wires due to the high Di/Dt. I've also read that phase angle fired tends to have high EMI (electro magnetic interference) due to the fact that it creates harmonics.
I'm very open to those, opinions and suggestions for using a Phase angle fired SCR for a high load (over a two dozen KW) resistance heater.
I'm trying to control a large resistance heater to high accuracy using an SCR controller. Issues have been raise whether to use the phase angle fired or zero voltage cross.
I'm more inclined to use the phase angle fired because i believe it can reach higher accuracies since zero cross is bound by each period of the 50 sine waves (50hz). However i'm also aware that phase angle fired is predominantly reserved for high response heaters such as wires due to the high Di/Dt. I've also read that phase angle fired tends to have high EMI (electro magnetic interference) due to the fact that it creates harmonics.
I'm very open to those, opinions and suggestions for using a Phase angle fired SCR for a high load (over a two dozen KW) resistance heater.