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  1. Replies
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    The 300 foot (100 meter) limit on copper for the...

    The 300 foot (100 meter) limit on copper for the ethernet. I have had to go further and I have used a two port POE switch to divide the longer runs into two segments.
    The POE power supply is on one...
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    1,614

    Many electricians have not had experience with...

    Many electricians have not had experience with harmonics and transients. I can assure you that thes problems are real life in many applications and are of greater concern where non-linear loads are...
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    The Fluke 43 series (43, 435 436 437) power...

    The Fluke 43 series (43, 435 436 437) power quality meter is what I would use, but the cost is pretty high for occasional use. I am in a little different business and we can justify top tier test...
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    I would have deleted the double post entirely if...

    I would have deleted the double post entirely if I could figure out how to do it!
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    But the Fluke 190-204S has 4 isolated inputs....

    But the Fluke 190-204S has 4 isolated inputs.
    Also I realy was also talking about the metal chassis on the old AC powered oscilloscopes where you also had to remove the safety ground to work with...
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    If you need one there is nothing else that comes...

    If you need one there is nothing else that comes close. If I had to set up an oscilloscope in some industrial applications it can be really a pain and also dangerous. The danger comes from the need...
  7. Thanks.

    Thanks.
  8. Evaporator coil bypass for additional humidity control?

    I remember reading about a bypass of the evaporator coil to reduce the tem of the coi, increase run time etc to lower the humidity in the house. my question is how much what are the relative benefits...
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    You are quite correct. Whenever three phase is...

    You are quite correct. Whenever three phase is involved the square root of three has got to be in there somewhere.
    I am sorry, I really did not look at the motor dataplate very closely.
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    It is a 5 HP at 208/230 and a 5 hp at 460 as...

    It is a 5 HP at 208/230 and a 5 hp at 460 as well/
    It is a 3 hp on 50 HZ since it is running slower The voltages are also different at 50HZ.
    A 1800 rpm motor at 60 HZ runs at 1500 rpm on 50 HZ....
  11. Thread: Comfort Net

    by jbarron4
    Replies
    0
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    376

    Comfort Net

    I hope you guys don't consider this too DIY for the forum, but here goes.
    As a control professional in industrial applications I have wondered about the Comfort Net on my Amana heat pump. I think...
  12. If you look at the pump power curves you will see...

    If you look at the pump power curves you will see the power at tlow RPM is very low and the ehat produced by the motor is also very low. The power increases on the square (or more) with RPM.
    50% rpm...
  13. There is no particular need to worry about the...

    There is no particular need to worry about the minimun pump speed. Since ths wear increases at least on the square of the speed running slow and not pumping is no particular problem.
    Check valves...
  14. VFD can work pretty much anywhere and I use them...

    VFD can work pretty much anywhere and I use them for many applications especially where there is changiong demand and the need for auto matic fail over.
    The set point would demand on just what you...
  15. Thread: Back button

    by jbarron4
    Replies
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    2,855

    Too old and set in our ways to do that and it...

    Too old and set in our ways to do that and it takes clicking the mouse button and not the keyboard backspace.
    Also hadn't thought of it either. So There!
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    Trane VariTrac CCP

    We have a small office /operations building with a Trane package unit and Trane VariTrac CCP system. In the three years I have been in the building I have been comfortable for perhaps part of a day....
  17. Thread: Back button

    by jbarron4
    Replies
    62
    Views
    2,855

    I get so many double click and and googleads etc...

    I get so many double click and and googleads etc that this site is a real PITA.
    I may quit checking on what is happening if it gets worse.
    I have tried adding the offending sites to the restricted...
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    We have plenty of A/C for the control room.The...

    We have plenty of A/C for the control room.The air will be drawn fronm outdside of the control rooms / server rooms. The air will be considerably hotter than what is inside, but either I add a single...
  19. Allen bradley sold bare drives you could build...

    Allen bradley sold bare drives you could build what you wanted and also packaged drives that included the control wiring and bypass contactors. Get the numbers off of the enclosure and call your...
  20. I think the 1336 has an automatic restart after...

    I think the 1336 has an automatic restart after power loss feature.
    The following link will take you to the AB.com search page:...
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    I am leaning on installing the Williams unit...

    I am leaning on installing the Williams unit inside the control room and using one hole sawn through the filled block wall to draw in outside air with a damper to control the amount of outside air....
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    It sounds to me like the coild are going bad...

    It sounds to me like the coild are going bad because the starter is not pulling in completely and the solenoid is not closing the magnetic circuit. The coil pulls down the "core" of the solemoid to...
  23. Thread: VFD go bad???

    by jbarron4
    Replies
    10
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    704

    The cost of the newer VFDs has come down a lot in...

    The cost of the newer VFDs has come down a lot in the last 10 years and the usability has increased many times. The user interfaces are better,too.
    Thes new drives are also pretty relaible.
    If you...
  24. Thread: VFD go bad???

    by jbarron4
    Replies
    10
    Views
    704

    Most of the new VFD drives are made using surface...

    Most of the new VFD drives are made using surface mount technology for the parts on the circuit boards. The smaller ones are probably not economically repairable. The larger units have replacement...
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    Thanks for the suggestions. I think that the 400...

    Thanks for the suggestions. I think that the 400 CFM @0.6" H20 is enough to pressurize the 4 rooms in the building There are two doors and no windows. One exhaust fan in the restroom seems to be on...
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