Search found 69 matches

by jward
Sun Feb 12, 2017 9:04 am
Forum: Wiring, Electrical, Relays and Sensors
Topic: 7segment relay
Replies: 1
Views: 7052

7segment relay

Anyone have specs on the 7 segment display? Looking at the old version of BCS docs (the new Wiki docs are nice thank you very much) the PDF at the brewtroller link is corrupt. The oscsys link doesn't do to info on the display. I understand these are old links. I ran into an interesting issue. The di...
by jward
Tue Jan 24, 2017 8:35 am
Forum: General Discussion
Topic: failure design
Replies: 7
Views: 3863

Re: failure design

I thin I am sort of doing that now. Currently, I have the glycol process as the highest process. The entry state controls the temp. The exit condition for that state is the float switch. The next state turns off all of the protected devices. Speaking of failures.... My AC unit is no longer cooling. ...
by jward
Mon Jan 23, 2017 5:45 pm
Forum: General Discussion
Topic: failure design
Replies: 7
Views: 3863

Re: failure design

Interrupting the relay input is a good idea for safety. For my use I have 2-3 relays to interrupt. I'd need a triple pole triple throw switch.
by jward
Sun Jan 22, 2017 6:46 pm
Forum: General Discussion
Topic: failure design
Replies: 7
Views: 3863

Re: failure design

normally open (NO) or normally closed (NC)
by jward
Sun Jan 22, 2017 6:43 pm
Forum: BCS Programming
Topic: glycol safety feature
Replies: 4
Views: 8754

Re: glycol safety feature

Why are you using a float switch on the glycol? It should be a closed system that would never get to a low glycol level. You have the volume in your conical jacket (or coil) plus the reservoir volume. Why would the level ever drop? A leak in the system probably with a host or fitting. I would keep ...
by jward
Sun Jan 22, 2017 3:08 pm
Forum: General Discussion
Topic: failure design
Replies: 7
Views: 3863

failure design

What are standard failure practices and designs? For instance, my desire is to keep relevant equipment turned off if a float switch indicates an error condition. I was thinking about how the switch should be wired. It seems one might set the din to normally closed so that if the sensor/switch wasn't...
by jward
Sun Jan 22, 2017 2:15 pm
Forum: BCS Programming
Topic: glycol safety feature
Replies: 4
Views: 8754

Re: glycol safety feature

New approach. Created a "glycol" process set to run at start with 2 states. The entry state is "glycol normal" which has hysteresis control of the AC unit. Ladder logic is used to always run the pump when the AC is on. (I may put them on the same power source and not worry about ...
by jward
Sun Jan 22, 2017 1:38 pm
Forum: Roadmap and Feature Request
Topic: Ladder Logic
Replies: 3
Views: 8035

Re: Ladder Logic

Seeing some of the power of the online tools I was wondering if some of the programming might be better done via an external web interface and installed via the API. Just thinking out laud, it seems the BCS would have more room to operate if it didn't have to support all the programming internally. ...
by jward
Sun Jan 22, 2017 7:20 am
Forum: Roadmap and Feature Request
Topic: Ladder Logic
Replies: 3
Views: 8035

Ladder Logic

It would be nice if the ladder logic editor used the configured names for inputs, outputs, processes, etc. or showed them in legend where those are dragged to the ladder.
by jward
Sat Jan 21, 2017 8:09 pm
Forum: BCS Programming
Topic: glycol safety feature
Replies: 4
Views: 8754

Re: glycol safety feature

Wiring up a switch and leds for bench testing shows the ladder logic is not a good choice for the safety. Well, at least not with having the rest of the control logic in processes. I had the wrong idea that output would only be effected when the input was raised instead of the correct understanding ...