I have two T2X rotors and just replaced one that jammed with one I have
recently rebuilt, complete with a new direction potentiometer. All was well
until a couple of days ago, when I noticed that approaching the CW end of
rotation, I couldn't get a direction indication beyond about 160 deg yet, when
the brake disengaged, the direction indication went to 180 deg. Playing with it
some, the problem has worsened such that I don't get a good direction
indication much south of about 120 deg or so, though it clears up when the
brake is disengaged. I initially thought it was contaminates on the wiper arm,
but the change in direction indication is so consistent with brake actuation
that I am no longer confident that contamination on the wiper arm is the
problem.
The rotor has the AMP connector installed and tested good on the ground. I'm
using a Green Heron RT-21 controller.
I'm beginning to suspect either a bad connection in the ground pin of the
rotor. After insuring that the basic resistance checks yield nominal values, I
plan to go up and visually inspect the connector and plug. An "out there"
scenarios is if, for some reason, the internal common ground developed a
problem under brake activation (due to excessive, but not outrageous,
resistance) brake current could be divided between a poor ground and the the
grounded wiper of the direction potentiometer, yielding both a burned up
direction potentiometer (at least on one end) and strange direction
indications. Has anyone ever seen problems with the *internal* grounding of the
T2X or a direction indication vary considerably related to brake actuation?
Kim N5OP
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