Hi all,
I'm new to this forum and hope that you can help me. I'm in the process of building a control cabinet for my home brewery. The brewery consists of three heating elements (3500W) but I only have available two 16A power feeds (220V, living in Norway).
The heating elements are controlled by 4 contactors, K1, K2, K3 and K4, where K2 & K3 are for Heater 2. To control the 4 contactor I have three switches, on my drawing showed as NO, but can I can add more NC or NO to these.
I've created a logic on how this should work, with switching sequence in left column. The main areas of concern is that K1&K2 must never activate at the same time. This also applies to K2&K3 and K3&K4. All the contactor have additional 1xNO and 1xNC that can be used. If needed I can also add more relays. The control voltage for the contactors are 24VDC.
Attached is also a ladder diagram showing my thinking, but I'm stuck. No matter how hard I try I'm not able to solve this, it has been too long since my electronic exams.
Maybe not a very good description, but I hope it's understandable.
I'm very grateful for any help, my brewing of beer depends on this