If the worm wasn't engaged, the rotation would be uncontrolled. Since
it has 50 degrees of free motion it is likely one or more teeth from the
wheel or worm are broken, mostly likely wheel since the rotation is
limited. More teeth might get broken as the antenna free spins into one
tooth as a hard stop against the worm. I would think they designed the
worm/wheel contact angles so the worm could not be turned by torque from
the wheel.
Happened differently in my Orion 2800 last month, the drive gear held
and a tooth broke off the large gear on the output shaft. There was
about 30 degrees of free antenna motion and the same GH error message.
The root cause was free play in the output spline which allowed too much
backlash ultimately braking a gear tooth.
Grant KZ1W
https://www.motioncontroltips.com/when-are-worm-gears-self-locking-and-where-is-this-useful/
On 12/24/2022 19:07, tony.kaz--- via TowerTalk wrote:
I have had the 61D for several years and it was worked well. It is turning an original SteppIR MonstIR. I
have a Green Heron RT-21 with the GH pot in the 661D. The other day when I went to turn the antenna nothing
happened.I tried using a 12V supply. Same problem.When I try to turn the antenna, I get an "ERROR
NO MOTION" .Current draw is 400mA.I am feeding the rotator with three #14 wires for CW, CCW and
GND.Since this problem occurred, the antenna has been slowly moving in the wind from 280 degrees to 231
degrees - both actual movement and reading on the controller match. My thought is the motor's worm gear is
not engaged so therefore it can't act like a bake. Is it possible the motor is running fine but not
engaged with the pinion gear? Is 400mA the correct current?
Any thoughts or ideas before I climb?ThanksN2TK, Tony
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