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  1. Replies
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    I acquired two of these battery chargers, one had...

    I acquired two of these battery chargers, one had blown up.

    Low-noise, high-power 12V battery chargers (adjustable 13.8 VDC, 15 to 90 amps) with 2 year warranty

    I have 2 of the 45 amp versions....
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    what i would do at this point is find the 6 wires...

    what i would do at this point is find the 6 wires that turn the igbts on, and disable them. desolder the pin from the board.

    then power it up and see if it still says sc fault.

    if not, then...
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    so chances are good that the 760 volts that was...

    so chances are good that the 760 volts that was produced on the dc bus when you powered it up at double the input voltage.. is not enough to blow everything up.

    but something failed, and you need...
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    the only way i can imagine you blew up a...

    the only way i can imagine you blew up a capacitor is to have incorrectly wired it such that you formed a voltage doubler and the capacitors exploded. in which case, you may need to replace all of...
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    I built a load dump box for a man with a brother...

    I built a load dump box for a man with a brother spedio. (a string of zeners in series with a solid state relay which turns on a resistor)

    when his spindle dynamically brakes from 16k rpm to stop...
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    Found your email in my spam box. usp ground...

    Found your email in my spam box.


    usp ground is quoting me

    338$ for 145 pounds, 41" high by 23 by 31" (dimensions of the unit plus 6 on each side.)
    193$ for 145 pounds, 26 by 18 by 38" high. ...
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    did you get my email

    did you get my email
  8. The smaller cap on the compressor would cause it...

    The smaller cap on the compressor would cause it to draw increased amps, but much of that amp draw is not "real" and does not reflect the true load on the motor. 60uf would push the motor into...
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    I would investigate why its rubbing before simply...

    I would investigate why its rubbing before simply turning the rotor down.

    Doubling the air gap to get the motor to work will decrease its power factor and if the windings are compromised by...
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    Way i see it is the slop in the socket to bolt...

    Way i see it is the slop in the socket to bolt head allows for the socket to gain some rotational momentum before it slams into the bolt head (with the hammer in the impact gun behind it)
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    i'm interested. how much we looking at for...

    i'm interested. how much we looking at for shipping to 98110. have loading dock if it makes any difference.
  12. So for what ita worth.. Im 33yrs old raised by...

    So for what ita worth.. Im 33yrs old raised by parents who are about 20 years in the past compared to normal, and even though i have heard that term.. "Hes touched" by various adults since age 12 or...
  13. The smallest physical size transformer for this...

    The smallest physical size transformer for this application is going to be 3 toroidal cores.
    (unless you want to pay lots of money for tape wound C or E cores)

    Try asking toroid dot com for...
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    You will need to run the control boards for those...

    You will need to run the control boards for those machines off of regular single phase mains.

    Then use the output to control the vfd somehow.

    Regarding the motors, it is likely not worth your...
  15. nah, should take all of 10 minutes to disconnect...

    nah, should take all of 10 minutes to disconnect some of the capacitors and measure the voltage.

    take the cover off the panel and take a photo of the caps and post it.
  16. seems to me that you could add just the...

    seems to me that you could add just the emulsifiers as needed, rather than using up more product.

    An analogy would be: buying the concentrated corrosion inhibitors rather than changing the...
  17. its likely running hot and just needs some...

    its likely running hot and just needs some capacitors removed.
  18. I suspect a 10hp drive is large enough to direct...

    I suspect a 10hp drive is large enough to direct online start a 2 hp motor. certainly a 1.5hp motor. if other motors are running then the available buffer is reduced. the drive should trip on...
  19. Thread: cutting gears

    by johansen
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    5,510

    I agree that is a spur gear and given the cast...

    I agree that is a spur gear and given the cast iron bucket for oil, it should last forever in this kind of duty if lubricated.

    working backwards from a feed rate chart would be helpful, but not...
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    What is the shaft diameter? secondly, when...

    What is the shaft diameter?

    secondly, when talking about starting the motor on 440.
    what that means is using 3 contactors aka 3, 3 pole relays to connect the motor for 440 and start it on 220.
    ...
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    use an idler to spool up the rpc. after the...

    use an idler to spool up the rpc.

    after the idler comes up to speed, connect the rpc to the mains power.

    There is a potential problem others have reported: the idler can generate its own...
  22. rotary encoders are produced in a variety of ways...

    rotary encoders are produced in a variety of ways but many are an etching process using a master. the substrate can be plastic or glass.
    a company i work for buys a custom reticle and its chrome...
  23. since you've got what looks like a 3:1 ratio, it...

    since you've got what looks like a 3:1 ratio, it should be very easy for you to hold a ruler against the servo pulley and scribe a line on it, anywhere. then move the machine one turn of the servo...
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    the issue is that the generated phase of a RPC is...

    the issue is that the generated phase of a RPC is relatively weak.

    If you imagine two identical 3 phase motors, one of them run as an rpc with no capacitor boost, when you plug the second one...
  25. a fine scribe line marked on the end of the cog...

    a fine scribe line marked on the end of the cog pulley.. will show you something.

    1/100th of a turn is about 3 degrees, or 2.5 thousanths of an inch for a .25" pitch ball screw. you should easily...
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