Hi Ken, an often overlooked problem with the T2X and HAM series rotator is
a defective phase shift capacitor. When these capacitors age, and heat
helps do that, they become lossy and the rotator looses power.
This capacitor is a large non polarized electrolytic unit located inside
the control box. For a test, you can substitute a capacitor intended for use
as a starting capacitor in 120/240 vac motors.
73,
Gerald Williamson K5GW
GM Texas Towers
In a message dated 7/30/2015 4:14:17 P.M. Central Daylight Time,
krgoodwin@comcast.net writes:
>From all indications with the outside temps reaching 100 degrees F, one or
both of my two TB3 thrust bearings seems to be binding. All TX2
Tailtwister
rotator electrical data measured from the ground matches my baseline
(resistance), I can hear and feel the brake release and the voltages
applied
to the TX2 motor windings are normal but until this morning when it got
into
the 80's - it wouldn't budge at all. I use one thrust bearing on the top
platform and a second as a means to remove the rotator if ever needed and
keep the tangential loads off of the TX2 rotator. I believe this happened
the day before and it was in the same position (332 degrees). Usually when
the 40 meter beam fails to rotate, the TX2 brake mechanism is binding even
with the Green Heron RT-21 rotation algorithm (small rotation the wrong way
before rotation to the commanded setting). Is heat a feasible failure
mechanism for a Rohn TB3? Anybody else ever run into this problem? Ken
K5RG
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