Results 1 to 5 of 5

Thread: spyder stager

  1. #1
    Join Date
    Jan 2005
    Location
    steeler nation
    Posts
    2,074

    spyder stager

    when using a aia into a stager, the first stage will not turn off when cmnd% = 0. i was told on the hwell forum to use a cycler instead of a stager. the help docs state " set cph=0 means stager functionality". when i attempt to set cph=0 i get a "invalid range" mesage.
    also when anticipator authority is set to 100,the value reverts back to 1 when the config view is viewed again.

    does anyone have a solution for this?

  2. #2
    Join Date
    Mar 2005
    Location
    Virginia
    Posts
    1,144
    Check out the manual, it shows that it will not turn off the first stage until your -Hyst. So if your Hyst is set for 10, then your stager input needs to be less than -10 for it to shut off.

    And I posted a solution... Did you not like that one?
    “It is impossible for one to learn what one thinks they already know"

  3. #3
    Join Date
    Jan 2002
    Location
    Fort Worth\Dallas, Texas
    Posts
    1,700
    You could also just put a -1 subtract block between your aia and stager.
    Go Rangers!

  4. #4
    Join Date
    Jan 2005
    Location
    steeler nation
    Posts
    2,074
    code i did what you suggested and used a ratio block and it worked. it seems strange you have to take those steps to turn off your last stage.

    john h sugested the cycler and i thought it might save a step but it seems that the documentation is wrong or i am not setting up the cycler block correctly. i suppose the spyder is a work in progress.

    being fairly new to control programing, and not doing it 100% of the time(we have alot of no heat calls,start ups and piping to do) and having only worked with lcbs and now webs i guess i'm niave in thinking this stuff should work as expected. i suppose you will have this when software engineers , not control or hvac guys, write the programs.

    code and L i appreciate your help

  5. #5
    Join Date
    Mar 2005
    Location
    Virginia
    Posts
    1,144
    ALL software is a work in progress...
    “It is impossible for one to learn what one thinks they already know"

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event