[TowerTalk] Prosistel 61D

[Glenn Thorne]

Had that problem with PST2051 and it was a simple shear pin on the motor
shaft.

73, Glenn - KD0Q

On Sun, Dec 25, 2022 at 3:53 AM Peter Voelpel <dj7ww at t-online.de> wrote:

> I had the problem with a not engaged worm with 3 of my 4 PST2051.
>
> https://a4.pbase.com/o6/91/283791/1/76698259.eZnxkcm3.pst2051.JPG
>
> 73
> Peter, DJ7WW
>
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> Grant
> Saviers
> Sent: Sonntag, 25. Dezember 2022 04:47
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Prosistel 61D
>
> 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/
> <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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