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Type: Posts; User: gar

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  1. 141022-1427 EDT I have a UPS that switches to...

    141022-1427 EDT

    I have a UPS that switches to backup at about 99 and returns to wall power about 105 V. Backup voltage is about 111 V with no load. At the high end goes to backup about 129 V and...
  2. 141022-1358 EDT Many UPS units have an output...

    141022-1358 EDT

    Many UPS units have an output that will provide information from the UPS. For example voltage. Start monitoring a unit that has triggered in the past and has this monitoring...
  3. 141022-0917 EDT GoldDigger: The hot bus...

    141022-0917 EDT

    GoldDigger:

    The hot bus bars in my 200 A QO panel are about 1/4" x 3/4" and I believe copper. These are not going to heat much as a result 200 A, but certainly serve as a...
  4. 141021-2122 EDT I pointed out in post #11 that...

    141021-2122 EDT

    I pointed out in post #11 that a panel rating is really based on thermal factors.

    Total current, however you want to define it, is not the criteria that determines the panel...
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    141021-1237 EDT ptonsparky: I believe you...

    141021-1237 EDT

    ptonsparky:

    I believe you have two cooking tanks each with a full volume of 486 bushels, and a level control range of 60 bushels at the top. I also believe this 60 bushels...
  6. 141020-1949 EDT Chip0628: The panel current...

    141020-1949 EDT

    Chip0628:

    The panel current rating is based on the current capability of an individual bus bar and its termination points. This is essentially a thermal problem in one fashion...
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    141020-1352 EDT ptonsparky: The mixing...

    141020-1352 EDT

    ptonsparky:

    The mixing auger is driven by a fixed speed 7.5 HP motor with a power monitor. The flow rate thru the mixing auger is determined by the rate that corn is fed into...
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    30$$
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    141020-0743 EDT ptonsparky: I need to...

    141020-0743 EDT
    ptonsparky:

    I need to unscramble this statement. I do not understand it ---


    (10) What does "Max load" mean? Is "maximum load" the maximum short time average motor power input...
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    141019-1706 EDT I should not have used the...

    141019-1706 EDT

    I should not have used the approximation approach I used above. Rather it is better to assume the 6 W PV panel was designed to be in its constant current region when charging a 12...
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    141018-2410 EDT GoldDigger: In post #4 you...

    141018-2410 EDT

    GoldDigger:

    In post #4 you mentioned an open circuit voltage of greater than 18 V. And I used 9 V for the maximum power point to the load based on 18 V. Not very accurate...
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    141018-1140 EDT Some guesses based on...

    141018-1140 EDT

    Some guesses based on practically no information.

    Assume for simplicity that the solar panel can be represented by a voltage source, Vs, and an internal resistance of Ri.
    ...
  12. Thread: Potential relay

    by gar
    Replies
    9$$
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    325

    141017-2134 EDT Most relays have two states,...

    141017-2134 EDT

    Most relays have two states, energized and de-energized.

    For two state relays pull-in is the input threshold level where the relay changes to its energized state. Drop-out is...
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    30$$
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    141017-0845 EDT ptonsparky: I would like to...

    141017-0845 EDT

    ptonsparky:

    I would like to get a clear picture in my mind of this system. So some questions.

    Background and questions:

    (1) There is a mixing auger. I believe this is...
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    11$$
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    141017-0826 EDT Jraef: What does the...

    141017-0826 EDT

    Jraef:

    What does the Allen-Bradley VFD do when the motor rotor is locked? Is there any signal indicating this state? How long can the VFD and motor tolerate a locked rotor...
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    12$$
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    322

    141016-1544 EDT Possible method. I have never...

    141016-1544 EDT

    Possible method. I have never tried it. Use a smaller motor, possibly DC with current limiting, to accelerate the rotary phase converter up to its running speed, possibly just...
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    141016-1135 EDT Another approach: Mount an...

    141016-1135 EDT

    Another approach:

    Mount an encoder on the motor. Upon release of the brake if the wrong motion is detected from the encoder, then reapply the brake and set an alarm.

    This is...
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    141016-1107 EDT factoryrat: Consider this...

    141016-1107 EDT

    factoryrat:

    Consider this approach that will depend upon the VFD itself. Assume the VFD can be programmed for a low speed and low torque limit

    Create a selectable VFD mode...
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    141015-1940 EDT I can not say for sure, but I...

    141015-1940 EDT

    I can not say for sure, but I think Tom wants information on the motor load to get information about the amount of product being moved. Without measuring ouput torque and speed...
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    141015-1553 EDT ptonsparky: Is this the...

    141015-1553 EDT

    ptonsparky:

    Is this the same project that has the 5 and 7.5 HP motors that move corn with augers and to which you want to monitor power input?

    Why does someone want you to go...
  20. Thread: threshold

    by gar
    Replies
    1$$
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    159

    141015-0842 EDT What is BMI? Quick Internet...

    141015-0842 EDT

    What is BMI?

    Quick Internet search brings up "Body Mass Index".

    "Threshold" --- see http://www.merriam-webster.com/dictionary/threshold

    Electrically a threshold usually...
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    30$$
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    141014-2340 EDT With the information you have...

    141014-2340 EDT

    With the information you have available there is no way to calculate how long to fill the tank.

    What I mean by this is that you have no information on the output flow other than...
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    141914-2137 EDT Troubleshooting involves...

    141914-2137 EDT

    Troubleshooting involves logical analysis, measurements at various points, knowledge of the characteristics and capabilities of your instruments, electrical circuit theory, and...
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    141013-1132 EDT In post #4 the current...

    141013-1132 EDT

    In post #4 the current requirements were 25 A at 480 and 50 A at 240. We should asssume these are line-to-line voltages. It probably does not matter whether the generator coils are...
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    33$$
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    141013-0919 EDT Sort thru this site and see...

    141013-0919 EDT

    Sort thru this site and see what is available.
    http://www02.abb.com/global/huabb/huabb008.nsf/0/cac3b7d5fe294b95c1257a2c004695f4/$file/Rotary+cam+switches.pdf

    .
  25. Replies
    33$$
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    839

    141013-0845 EDT The generator size...

    141013-0845 EDT

    The generator size Oregonbythesea is talking about is probably a 20 kW unit. A Kohler 20RESA falls in this category. This has an engine that falls in the range of 27 to 30 HP. To...
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