[TowerTalk] Prosistel 61D

[tony.kaz at verizon.net]

Glenn, Peter and everyone else, thanks for the feedback.I would assume there is a shear pin on the motor shaft of the 61D too.Does anyone have the mechanical drawings of the "guts" of the 61D? Maybe it will also show the size of the shear pin, if that is the problem. I would like to be prepared when I tilt over the tower so that it doesn't sit on the ground for weeks.  So far the rotation has been only CCW. Now down to 212 degrees. I have thought about buying a replacement rotator set up for Green Heron. This way I could just swap rotators and rebuild the old one or even send it back to Array Solutions for rebuilding.Stil curious if the motor draw of 400mA is normal and if that indicates the motor is turning but not turning anything?
Merry ChristmasN2TK, Tony


-----Original Message-----
From: Glenn Thorne <kd0q.glenn at gmail.com>
To: towertalk at contesting.com
Sent: Sun, Dec 25, 2022 8:49 am
Subject: Re: [TowerTalk] Prosistel 61D

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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