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Kearnstd
Space Elf
Premium
join:2002-01-22
Mullica Hill, NJ
kudos:1
reply to alphapointe

Re: uC Boiler Sensing

somehow I am not surprised it needs special software. All the better to milk money with. Of course that software may also allow computerized control and functions beyond diagnostics.

I can imagine the chiller being that old being kind of scary. Main thing to be aware of with alarm contacts on something that old is they might energize with line voltage when the unit needs to alarm. Verses a 24v control voltage.(keep in mind in some systems running 3ph and voltages higher than 240v, control voltage can simply mean single phase 120v.)
--
[65 Arcanist]Filan(High Elf) Zone: Broadband Reports


alphapointe
Don't Touch Me
Premium,MVM
join:2002-02-10
Columbia, MO
kudos:2
Reviews:
·Socket Internet ..
I've got the prints for it, it's just a dry contact closure on each of the three alarm relays.

The chiller is 480V 3ph, and when it starts, the contactor pulls in with a sound like a shotgun blast... it's one of those things where you press the start switch and nearly hit the deck anticipating an arc flash...

I'm considering putting a solid state relay across the 120V start/reset switch so we can start/reset the chiller remotely from the web interface to the PLC...
--
"When the hammer drops, the bullshit stops"


alphapointe
Don't Touch Me
Premium,MVM
join:2002-02-10
Columbia, MO
kudos:2
Reviews:
·Socket Internet ..

1 recommendation

Click for full size
I can't get back far enough for a full picture of this beast...

Everything is online and seems to be working fine. I think I'm going to need a third DA board, though, as each DA board only has 8 digital inputs, and the boilers take up 10 of the 16...
--
"When the hammer drops, the bullshit stops"