There are too many non-variables here. This is so because there are several units in the field to be retrofitted. Each one has a set of loads (actually flexible 'blanket type heaters) that the technician connects according to a set of instructions - get it now? The resulting solution must be...
1. I haven't yet placed SCR's on the secondary, but yes, on the primary they sure make for a noisy transformer. I originally proposed controlling the load current on the secondary side, but was shot down by an EE who somehow got the configuration changed to the screwy SCR's on Primary scheme...
As for proverbial forests and trees - I designed the SCR controllers and they can be configured to do phase angle or zero-cross switching. I never gave the ZC method a thought for this application - and will do so now.
Thanks, jbartos!
Perhaps this will give me some new ideas.....Hmmmm...
Firstly, thanks.
The SCR's WERE on the primary simply as a means of limiting current. The No.1 objective of this project is to prevent circuit breakers from tripping. To clarify, this is a portable unit used in places where it can take hours to get access to a breaker somewhere across the...
I am working out a control solution for a load switching application, and I'm much more qualified as a 20 yrs+ controls eng'r than power, where I have minimal experience - hence, I need some assistance, please.
I'm working with a heating system with 3 pairs of independantly controlled resistive...
