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  1. #1
    Join Date
    Jun 2001
    Location
    San Diego, CA
    Posts
    1,149

    DX9100 sequencer module

    Maybe I'm just thick headed but I cant get this module working right.

    I'm controlling supply air temp by turning on/off 2 compressors.
    I want lead compressor to turn on and if after a time it's not able to make
    60 degrees, I want #2 to turn on. I have other parameters but they're all working. Right now I get 2 compressors all the way to SA low.

    SA temp High control = 70 low control = 52 input on inc@
    Stage 1 % 60 Stage 2% 40 diff %20
    comp 1 is Stage 1 first of 1
    comp 2 is Stage 2 first of 1

    Hoping that's enough data.
    Not much hair left, please help.

  2. #2
    Join Date
    Jan 2007
    Posts
    145
    so many parameters
    If you could E-mail the gx file I could look at for you.

  3. #3
    Join Date
    Mar 2003
    Location
    Washington,NJ
    Posts
    504
    It's hard enough controlling DX off of DA-TEMP control, your SEQ module needs to be defined as a 2 stage control, Stage 1 on @ 20%, set Stage 2 @ 60 which would activate that Stage @ 80%, set your PID Prop @ 35-40 and Integral Time @ .1, zero out the Derivative. Make sure retroactive = 1. That should be a decent starting point, Good Luck.

  4. #4
    Join Date
    Jun 2001
    Location
    San Diego, CA
    Posts
    1,149
    Thanks all, I'll try those settings. Makes a little more sense, the percent loads are additive.

    In the meantime, I'm banging the comp's off ACO's in the PLC's. Ideally I'd prefer the sequencer since you get all those neat little inputs to boot. One module's worth a dozen lines of plc.

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