Re: Luxtrol D2500 and D6000 Dimmers (Correction)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Harold Weiss by way of Terry Fritz <teslalist-at-qwest-dot-net>" <hweiss-at-new.rr-dot-com>

  Hi All,

I started in on attempting the D2500 modification and found that the
Powerstat 1156D brush is 1/8" longer and the T plate is narrower than what I
thought.  I'm removing 1/8" from the inside of the brass holder with a
Dremel cutter.  A drawing is at:

http://hot-streamer-dot-com/temp/brshmod.bmp

David E Weiss

 >
 > On the D2500 and D6000 variac dimmers, brush replacements are going to be
 > fun.  The D6000 can use the Powerstat 1156D brush directly.  Superior
 > Electric told me that it should be OK, but they don't know if it would
 > survive their 250,000 cycle test.
 >
 > The D2500 brush is where the fun begins!  Superior Electric does not make
 > that sized brush anymore.  However, the 1156 brush has two brush units
that
 > fit.  You will need to rebuild the T plate that screws into the rotor, or
 > use the one from the old brush.  Remember to cut the braid on the T plate
 > side, and reattach it to the new T plate.  The best part is that for the
 > price of the 1156 brush you can get two brushes.
 >
 > D2500: 20.8A, 0-120V, 2500W
 > D6000: 50A, 0-120V, 6000W
 > 1156 brush: $52 (Jenkins Electric)
 >
 > Both of these units were used in the old autotransformer boards in
 > theatres, and were made obsolete when the SCR dimmers came out.  These
 > units are taper wound, meaning that a second winding starts at 50%, to
give
 > higher current.  This also means that they can only be hooked up 1 way.
 >
 > David E Weiss
 >
 >
 >
 >