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Re: Something Simpler? [Re: LarryC] #181421 10/07/08 12:30 PM
Joined: Jun 2007
Posts: 301
JValdes Offline
Originally Posted by LarryC
If the VFD's can accept an analog input, use a 4-20 mA output or 1-5 V transducer for the temperature based speed control.

If the units can accept a Master / Slave relationship or a follower input, set one unit as the master and slave the other three off of it.

Larry C

Thats right. Contact your favorite VFD manufacturer and check with them. The VFD is no longer just a speed controller, I have seen them with PLC's on board (ABB)and will accept every imaginable input and can output too, on some models. They can work alone or with other VFD's and equipment as needed.
In fact, contact ABB through their web site. Then locate a local vendor. They are great about touting their products and will answer any questions you might have.
Note: Do not confuse ABB with AB!!!! Totally different.

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Re: Something Simpler? [Re: JValdes] #181425 10/07/08 02:57 PM
Joined: Sep 2006
Posts: 26
Beachboy Offline
I wonder if the CO monitor is actually meant to be a CO2 monitor? Lots of hot bodies dancing in a club will give off a lot of CO2 and create a "stale air" effect. A CO2 monitor might be intended to ramp up the ventilation if the atmosphere inside the club got too stale.

I've seen CO2 monitors/controls installed on HVAC systems in meeting rooms for the same reason...if the atmosphere gets stuffy with everybody breathing out CO2, then the system ramps up and brings in more outside air, to freshen up the room.

Re: Something Simpler? [Re: Trumpy] #181474 10/10/08 11:47 PM
Joined: Apr 2006
Posts: 6
MTWire Offline OP
Junior Member
In response to Trumpy's question, the system according to the plans is to be interconnected with the FCP, and all ducts are to have electronically controlled fire dampers that failsafe to close by means of a heat sensitive link in the event of a power failure. My question is... if they are vented directly outside from the room with no other rooms or floors in between, do they really need fire dampers and such, or would you just want them connected to the FCP to shutdown in case of fire?

And in response to Beachboy's last question, I do believe that the CO sensor is actually supposed to be a CO2 sensor, as there would be very little CO present in this particular situation.

Last edited by MTWire; 10/10/08 11:51 PM.
Re: Something Simpler? [Re: gfretwell] #181571 10/16/08 01:51 PM
Joined: Dec 2005
Posts: 152
Ann Brush Offline
These units are pretty standard equipment for agricultural barns housing confined animals - hogs, chickens etc. Most of the control circuitry can be bought off the shelf with inputs for various activation triggers like CO2 levels, Temperature, ammonia, humidity etc. In operation the worse the condition the more ventilation needed etc (or reverse). They also have the ability to incorporate outside sensors so you dont open up the throttle for full blast ventilation in the middle of winter.

Here's an example:

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