ADICON Support Forum Applied Digital, Inc.
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#23499 - 04/03/13 11:20 AM SECU16 input wire length
Charles Keiser Offline
newbie


Registered: 02/24/04
Posts: 3
Loc: PA
I have a small greenhouse and want to use an Ocelot and a SECU16 to fill water barrels in the greenhouse with house water. I do not want the electronics in the greenhouse because of the wet and humid environment. I have also had problems in the past with interference from motor driven foggers interacting with the electronics. Each night I want to refill the barrels using a 24V valve and monitor them with float switches. If I keep the electronics in the house and run 50 feet of cable from the SECU16 to the greenhouse and attach to the floats, will this work? Should this be terminated with a resistor?

Thanks

Chuck

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#23500 - 04/03/13 11:34 AM Re: SECU16 input wire length [Re: Charles Keiser]
Guy Lavoie Administrator Offline
Beyond All Hope
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Registered: 12/21/02
Posts: 6548
Loc: Montreal, QC, Canada
You mean for connecting the output relays and float switches? These are straight electrical connections, so no termination resistors are used (like you might with a data bus). It might be a good idea to install MOVs across the lines to protect from induced voltages though.
_________________________
"If you don't know what you're doing, do it neatly..."

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#23501 - 04/03/13 11:48 AM Re: SECU16 input wire length [Re: Guy Lavoie]
Charles Keiser Offline
newbie


Registered: 02/24/04
Posts: 3
Loc: PA
Thanks for the quick feedback. I read on the SECU16 sheet that supervised lines might require termination. The float switch will be monitored for an off/on condition. Thats why I asked about termination. With a long run of wire, I wasn't sure about interference.

Thanks

Chuck

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#23502 - 04/03/13 12:07 PM Re: SECU16 input wire length [Re: Charles Keiser]
Guy Lavoie Administrator Offline
Beyond All Hope
*****

Registered: 12/21/02
Posts: 6548
Loc: Montreal, QC, Canada
Oh ok, you're referring to the 1k end of line resistors for supervised inputs (this is different from "termination"). Yes, it would be a good idea to put these at the remote end instead of at the module. They won't do much in terms of handling interference, but this is a low impedance application anyways so it doesn't really matter.
_________________________
"If you don't know what you're doing, do it neatly..."

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#23503 - 04/03/13 01:42 PM Re: SECU16 input wire length [Re: Guy Lavoie]
Charles Keiser Offline
newbie


Registered: 02/24/04
Posts: 3
Loc: PA
Thankyou. I'll give it a try.

Chuck

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