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Type: Posts; User: DDC_Dan

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  1. Replies
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    If you dont mind - me too?

    If you dont mind - me too?
  2. Replies
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    Yup, your SSR uses dual SCR's, same as a triac,...

    Yup, your SSR uses dual SCR's, same as a triac, it won't work with a DC load.

    Sent from my ADR6300 using Tapatalk 2
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    Oops, maybe I misread your post(s). Are you are...

    Oops, maybe I misread your post(s). Are you are trying the resistive divider? I thought you were doing an SSR, if not my earlier post doesn't apply.
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    Are you sure the relay is not closing the...

    Are you sure the relay is not closing the contacts again? Is it possible that the output is staying closed, and that's the reason you're not getting any pulses?

    I say this because most SSR's are...
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    Are the building heat valves on DDC? Maybe a...

    Are the building heat valves on DDC? Maybe a strategy to gauge building demand via valve positions? Or possibly watch the delta T, warmer return indicating low load and time to stage off (and don't...
  6. Thread: What Fuse?

    by DDC_Dan
    Replies
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    4,111

    Those are the fuses for the control transformer...

    Those are the fuses for the control transformer primary. One fuse remains, and the TX is a single-phase load, so it's still protected against overcurrent. If the transformer primary were to go to...
  7. Thread: JC ZJ12

    by DDC_Dan
    Replies
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    462

    Just curious, how is not running the low side to...

    Just curious, how is not running the low side to the fan inlet a Honeywell product issue? I have used hundreds of them, they are a simple diaphragm switch like everyone else's and have always worked...
  8. Yesturday I cudnt evin spel engineer - today I...

    Yesturday I cudnt evin spel engineer - today I ARE wun!

    btw.... welcome to the forum, BMS!
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    Is this a DIY project, or commercial? If it's...

    Is this a DIY project, or commercial? If it's something you're just experimenting with, then something like this could fill the bill:

    http://www.mydtcstore.com/ (specifically the TinyDTC)

    In...
  10. Thread: BTU's

    by DDC_Dan
    Replies
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    1,203

    I type too slow..... Sent from my ADR6300...

    I type too slow.....

    Sent from my ADR6300 using Tapatalk 2
  11. Thread: BTU's

    by DDC_Dan
    Replies
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    1,203

    One BTU is the heat required to raise one pound...

    One BTU is the heat required to raise one pound of water one degree F. To use BTU as a unit of energy it is expressed as BTU per hour, or Btu/h.

    One ton of refrigeration is equal to 12000 BTU/h,...
  12. Replies
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    Ok,here's my two cents worth. Start with the...

    Ok,here's my two cents worth. Start with the opening closed (how else will you get the two rooms to their respective temps?). Gently open. The colder air is denser, and so will tend to flow over the...
  13. Thread: psycrometer

    by DDC_Dan
    Replies
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    3,910

    Joe, the OP did not say measure, he said...

    Joe, the OP did not say measure, he said calculate. I (and others I imagine) think he is asking if the sling psychrometer (or other means of measuring WB) is needed to calculate the target SH or SC,...
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    That is very cool! I wonder what the whole...

    That is very cool! I wonder what the whole machine costs?
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    The response time is what it is, not adjustable...

    The response time is what it is, not adjustable as far as I know.
  16. Replies
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    Just the one space is doing it, but all units in...

    Just the one space is doing it, but all units in that space are? I have had issues where the space static pressure was wrong, and the differential pressure pulled air out of the wall cavity and...
  17. Replies
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    How stupid... gotta use orange wall anchors for...

    How stupid... gotta use orange wall anchors for that wire size.
  18. For an unbalanced (120V) load the neutral carries...

    For an unbalanced (120V) load the neutral carries the exact same current the hot does...
  19. Aluminum?

    Aluminum?
  20. Replies
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    1,151

    That is just painful to watch...

    That is just painful to watch...
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    1,151

    I wasn't allowed to get my license until I...

    I wasn't allowed to get my license until I already had a job and had saved enough to start paying my share of the premiums.... of course that was 38 years ago.
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    Costco - been a member since 1984. Wife had a...

    Costco - been a member since 1984. Wife had a Sams card, let it lapse in favor of Costco.
  23. Replies
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    The tables imply it, but no one has mentioned it,...

    The tables imply it, but no one has mentioned it, there are two common 10K RTD's - type II and type III, best to use the table that matches your particular sensor. acsj's table lists them both.
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    Interesting. Usually the controls send a signal...

    Interesting. Usually the controls send a signal TO the VFD (like a speed signal), what signal is your VFD sending to the main board? Can you post the wiring diagram?
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    Could you give an example of one? I have not run...

    Could you give an example of one? I have not run across this, would be interesting to examine.
  26. Replies
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    If Ohm's law applies, (and it does), then 570...

    If Ohm's law applies, (and it does), then 570 ohms will not give the expected results:

    At 4ma:

    E = I R
    E = 0.004 X 570
    E = 2.28V

    At 20ma:
  27. Replies
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    Here is the normal hookup for a 2-wire 4-20ma...

    Here is the normal hookup for a 2-wire 4-20ma instrument converted to 1-5V at the controller (resistor is 250 ohm):

    379981
  28. That's one of those ideas that make you slap your...

    That's one of those ideas that make you slap your foerhead and wonder why didn't I think of that! Great idea!
  29. Replies
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    Um, Lon? You may not have a Cbus at all. XL800...

    Um, Lon? You may not have a Cbus at all. XL800 controllers can also integrate via Lon, in which case you are talking about a whole different animal, involving an LNS database and such.... (which...
  30. Thread: Serial Server

    by DDC_Dan
    Replies
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    504

    Lantronix UDS1100 - I use 'em by the bucketload....

    Lantronix UDS1100 - I use 'em by the bucketload. Works great.
  31. Thread: Modem Config

    by DDC_Dan
    Replies
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    664

    Forgive me if this was mentioned, I didn't see it...

    Forgive me if this was mentioned, I didn't see it - as I remember, to enter AT codes, you first had to get the modem's attention by typing plus three times in rapid succession "+++".
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    Welcome Dehno!

    Welcome Dehno!
  33. I found several examples of Excel to OPC server...

    I found several examples of Excel to OPC server software by doing a Google search. Perhaps you could get the vendor or custy to run one, and import the data into the Jace via OPC?
  34. Thread: Touch panels

    by DDC_Dan
    Replies
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    1,454

    Hi acddc, I have used an L-VIS (the BACnet...

    Hi acddc,

    I have used an L-VIS (the BACnet flavored one), but have not used both network ports. It's true, you can create a ring topology, but only if you use a switch that supports Spanning Tree...
  35. Thread: Touch panels

    by DDC_Dan
    Replies
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    Nope, it's for daisy-chaining multiple devices...

    Nope, it's for daisy-chaining multiple devices together without having to add a switch. The switch is built-in.
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    Neat! Glad it worked.

    Neat! Glad it worked.
  37. Thread: Touch panels

    by DDC_Dan
    Replies
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    If you read the description, it doesn't actually...

    If you read the description, it doesn't actually have dual network adaptors. It has two ports and a built-in network switch. No different than any other device with a single NIC plugged into an...
  38. You might check your drive as well. Some, like...

    You might check your drive as well. Some, like the ABB ACH550, are programmable to do floating control directly via two DI's (I have not personally tried this though).
  39. Or an AUD module: ...

    Or an AUD module:

    http://workaci.com/products/aud-flotating-point-analog-output

    If I read the OP correctly his main problem is how to display the speed though.
  40. You don't have to calculate the percentage....

    You don't have to calculate the percentage. Nearly all VFD's that I have seen (at least recently) have a 0-10V analog output that is or can be programmed to follow the VFD speed. There's your...
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    Here's a reference for purity levels for various...

    Here's a reference for purity levels for various grades of CO2 (from the same company hvac5646 used). It lists welding/industrial grade CO2 as 99.8% pure, and less than 32ppm H2O.
    ...
  42. Thread: Touch panels

    by DDC_Dan
    Replies
    20
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    1,454

    What is the intended function of the second NIC?...

    What is the intended function of the second NIC? Redundancy?
  43. Thread: BBMD vs VPN

    by DDC_Dan
    Replies
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    3,013

    I am so glad you said that. Landmine said VPN but...

    I am so glad you said that. Landmine said VPN but I heard VLAN, my comments pertained to a VLAN, not a VPN - until you typed them both together I didn't realize I was using the wrong term. Funny...
  44. Thread: BBMD vs VPN

    by DDC_Dan
    Replies
    43
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    3,013

    Landmine, have you read Chipkin's BACnet for...

    Landmine, have you read Chipkin's BACnet for Field Techicians?

    http://www.chipkin.com/files/pdf/Bacnet%20For%20Field%20Technicians.pdf
  45. Thread: BBMD vs VPN

    by DDC_Dan
    Replies
    43
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    3,013

    control$, have you put BACnet devices on a VPN,...

    control$, have you put BACnet devices on a VPN, where otherwise they would have been on different subnets, in lieu of using a BBMD? I could not get this to work. I would be interested if you have.
  46. Replies
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    Thank you, Google Translate! Marvin,...

    Thank you, Google Translate!





    Marvin, welcome, and I hope you find a good job in Texas!
  47. Thread: BBMD vs VPN

    by DDC_Dan
    Replies
    43
    Views
    3,013

    I have tried VPN's before. Although the IP's and...

    I have tried VPN's before. Although the IP's and SNM's would imply everyone is on the same subnet (logically), they really aren't (physically). Traffic still has to go through routers, and routers...
  48. Thread: service van??

    by DDC_Dan
    Replies
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    1,814

    I would hate to be in there during a head-on. The...

    I would hate to be in there during a head-on. The airbag would just hold my head in place as everything else beat me to a pulp...
  49. Could also be the sixth week of 2012, weeks more...

    Could also be the sixth week of 2012, weeks more common in date codes.
  50. Presumably your clock has been running, so it...

    Presumably your clock has been running, so it probably had an even earlier date when you bought it - but the default date for electronic equipment is almost never related to its manufacture date....
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