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  1. #1
    Join Date
    May 2002
    Posts
    9,564

    Inputs requiring external resistor/jumper?

    I was having a conversation with someone about powered inputs and on the topic I had remembered Circon UHC series had a jumper switch and they guy said with Distech you need to add the external resistor. I think XL800 modules need external resistor... so the question what do the other vendors do?

  2. #2
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    323
    They are probably talking about converting a 0-20 mA signal to 0-5 volts (w/ 250 ohm resistor), or 0-10 volts (using a 500 ohm resistor). Companies like ALC can handle 0-20 mA inputs, while Novar cannot (need external resistor to convert to voltage).

  3. #3
    Join Date
    May 2009
    Location
    California
    Posts
    106
    Don't forget ABB Drives D+ and Dcom.

  4. #4
    Join Date
    Jul 2007
    Location
    Sacramento, CA
    Posts
    250
    Schnider Electric(TAC) needs resistor to convert 0-10v to 4-20ma.
    CSI uses resitor to determind hte input value, these are built into the programmable boards.
    Distech uses resistors for there 4-20ma input signal.
    Distech also has jumper for output of 4-20ma or 0-10vdc
    Circon older controllers need the resistors for conversion also.

    Lontshooter

  5. #5
    Join Date
    Mar 2003
    Location
    NY
    Posts
    2,144
    KMC uses 'pullup' resistors. Rocker switches on the boards.
    "Controls is a lifestyle not a job" -klrogers

  6. #6
    Join Date
    Dec 2009
    Posts
    9
    Delta uses dip switches that apply different resistances.

  7. #7
    Join Date
    Dec 2006
    Location
    What? Who? Where?
    Posts
    1,692
    RyanT,

    When did Delta change to dip switches? All the controllers from Delta I have dealt with use jumpers for input/output configuration.

    Delta - Jumpers
    Reliable - Dipswitch (M1/M2) Jumpers (VAV/Zone/Stat) - Ext Resistor (4-20mA)
    tac Andover - Dipswitch
    Alerton - Jumpers
    Autmoated Logic - Jumpers
    tac Xenta - Software IIRC
    JCI - Jumpers

    kontrol out
    "Open is as open does." - Forrest Gump
    "Can't we all just get a Lon?" - Garry Jack
    "BACnet: integration or interrogation?" - The Janitor
    "Open protocols? You can't handle open protocols!" - Nathan R. Jessup
    “What’s that? Aaa… open protocols? Don’t talk about…. open protocols? Are you kidding me? Open protocols? I just hope we can hardwire an interface!” - Jim Mora http://www.youtube.com/watch?v=U7fjDS0jKiE

  8. #8
    Join Date
    Dec 2009
    Posts
    9
    Kontrolphreak,
    maybe I'm using the wrong term here. The inputs on all the newer (V3.22 and up) stuff use switches that are a bit larger than a typical dip, but I dont know what else to call them. On the switch, the installer can choose between 4-20, 10k, 5v and 10v.

  9. #9
    Join Date
    Nov 2006
    Location
    New Hampshire
    Posts
    255
    I always setup my inputs for voltage and use an external resistor to convert - 4-20mA signals to 1-5VDC or 2-10VDC (depending on the controller). That way I can troublshoot down the line easier with a meter rather than having to do the stupid put your meter in series with the signal thing....Just my $.02

  10. #10
    Join Date
    May 2002
    Posts
    9,564
    JustJohnson- Ask yourself which method is more susceptible to inaccuracy over distance? (0-10 or 4-20)

    --- now somebody here will tell you I'm just sales... but ignore that guy for now.

  11. #11
    Join Date
    Feb 2007
    Location
    Cullowhee, NC
    Posts
    30
    NDIO boards too...

  12. #12
    Join Date
    Dec 2009
    Posts
    9
    AHHHH! I'm deleriously tired. Delta uses jumpers, not dips. Not sure where my head was there!

  13. #13
    Join Date
    Oct 2008
    Posts
    67
    justjohnson - current remains the same over the entire circuit. go with 4-20 for distances. and there are meters that will read 4-20 without getting in series.

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