Tracer Summit CPC

[roadgear16]

anyone used CPC for a Heating water system? I have 3 boilers with a decoupled loop that I need to stage based on demand. I have heard of someone using CPC to accomplish this, but not sure how you would set it up. Obviously some CPL will be involved, but would be nice if you could use the add and subtract calcs in CPC for staging. Any help is appreciated.

[scrooloose]

Well I have used a similar setup doing AHU's that needed to be staged on demand, rotated, failure brings another one on etc..

You have to give the cpc fake temps and setpoints since the logic would be wrong for your setup. Then use the Force add and Force subtract referencers linked to some cpl based on your own temps and setpts. With the force points referenced it still runs through the timers in cpc, so in cpl you simply can do a >setpt or <setpt and let cpc timer run it out for you. You have to make BO's and set them up correctly to control your equipment, looking at status if you want failures, pump output if you need specific pumps turned on for each, etc..
and some cpl to turn the cpc on based on OA since built in one would be backwards.

So essentially you use cpc to force add, force subtract, enable another on failure, rotate, make avaliable/unavailable, run system pumps.

[summit-dude]

Cant be done with chiller plant control hence the name chiller plant control the add subtract logic is wrong. if you want to try it map your temp sensors to analog inputs and use -1 and 100 for range and offset in the ai editor this will reverse the input (if this is the right r&o haven't tried this in this application) or you can use an MP-581 as a plant manager and you can do the add subtract logic with a pid and deadband blocks and a simple and not feedback alarm block for the fail logic this seems easier to me than trying to re-engineer an application that is designed to run a chilled water plant

[scrooloose]

Cant be done with chiller plant control hence the name chiller plant control the add subtract logic is wrong.

It will work just fine as i stated using some simple 2 line CPL for add and subtract. Why reinvent the wheel when you have a great packaged program that will do everything he wants.

[roadgear16]

Thanks for the replies, I will try to set something up next week. Would rather use the calculations already provided in CPC than re-invent the wheel. I'll have to sit down at the site and think it out. You can use CPC for anything not just chilled water systems, thats why they are thinking about renaming it when the SC comes out next year.

[summit-dude]

"SC" is a component of a new platform called "EVO". The platform is out now and they didn't change the name of CPC it is still there but they did add a Boiler plant control application in the new platform that does perform the same function as CPC but for boilers. There is also a bridge for Evo to update your existing Summit system if you want to use the new applications. How did your project work out just curious I'd have written programming for it myself but thats just me.

[cg2]

Wouldnt there be a tekmar control already designed for your app?