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  1. Thread: Motor Starts/HR

    by gar
    Replies
    11$$
    Views
    322

    141029-1958 EDT If your drive can provide...

    141029-1958 EDT

    If your drive can provide current limiting (torque limiting) and you set this below the maximum continuous rating of the motor, then as a rough statement I would say there is no...
  2. Replies
    6$$
    Views
    191

    141028-1432 EDT I can not answer your...

    141028-1432 EDT

    I can not answer your question. However, some basic theory.

    A ballast in reference to a fluorescent bulb is a device to provide an approximately constant current under varying...
  3. Replies
    5$$
    Views
    208

    141025-2342 EDT An experiment with a diode in...

    141025-2342 EDT

    An experiment with a diode in series with the primary of a 170 VA 120 V transformer and no load on secondary.

    The approximate nominal full load RMS current to this transformer...
  4. Replies
    5$$
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    208

    141025-2132 EDT starbolin: If a dimmer is a...

    141025-2132 EDT

    starbolin:

    If a dimmer is a three wire dimmer (this will be the case if the dimmer requires a neutral), then for a delay to trigger type of scr switch the turn on point is...
  5. Thread: Volt AMPS vs watts

    by gar
    Replies
    4$$
    Views
    218

    14102032 EDT The answer depends upon whether...

    14102032 EDT

    The answer depends upon whether the appliance is a pure resistive load or not. Does this help you?

    .
  6. Replies
    5$$
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    208

    141025-1302 EDT Since you say the transformer...

    141025-1302 EDT

    Since you say the transformer burned up I assume this means the primary overheated and is now an open circuit. Verify this.

    Next find our the nature of the failure within the...
  7. Replies
    5$$
    Views
    264

    141024-1047 EDT panhandle444: Any pair of...

    141024-1047 EDT

    panhandle444:

    Any pair of wires used for a signal should be twisted or coax. This reduces magnetically coupled noise. If electrostatic shielding (electric field -- capacitive...
  8. 141023-2005 EDT 5 S electric: Use a Fluke...

    141023-2005 EDT

    5 S electric:

    Use a Fluke 27, 87, or even a Simpson 260 to measure voltage. I don't care whether it RMS or average reading. For the purpose here the Simpson is not the best, but...
  9. 0141023-0729 EDT 5 S Electric: I don't...

    0141023-0729 EDT

    5 S Electric:

    I don't believe you are using a logical troubleshooting procedure. Guessing, replacing, and try are not an effecdtive troubleshoot approach if you can get...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. Replies
    31$$
    Views
    1,202

    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...
  15. 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...
  16. Replies
    31$$
    Views
    1,202

    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...
  17. Replies
    31$$
    Views
    1,202

    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...
  18. Replies
    16$$
    Views
    749

    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...
  19. Replies
    16$$
    Views
    749

    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...
  20. Replies
    16$$
    Views
    749

    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.
    ...
  21. Thread: Potential relay

    by gar
    Replies
    9$$
    Views
    359

    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...
  22. Replies
    31$$
    Views
    1,202

    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...
  23. Replies
    11$$
    Views
    502

    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...
  24. Replies
    12$$
    Views
    363

    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...
  25. Replies
    11$$
    Views
    502

    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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