I don't see how it would be the shear pin, though, if your antenna is
rotating back and forth like you said. Even a free spinning worm gear
should not allow the toothed gear to move ... at least not very much and
not very quickly.
By the way, I also has the same problem with my 61D due to the high
rotating wind gusts I get at my QTH, and that was with less than 20 sq
ft of antennas (OB16-3 and OB2-40) on the mast. The swirling winds I
get in the spring can push on one end of the boom and pull on the other
... the forces combine instead of balance. My 61D worked for several
years, but all of a sudden after being parked at 30 degrees it was
swinging between 20 and 50 degrees. I'm certain it was due to some
broken teeth on the toothed gear.
I found a good deal on a 71D and haven't had a problem since. That may
seem like overkill until you witness the mini tornadoes I routinely get
due to spring thermals.
73,
Dave AB7E
On 12/25/2022 10:18 AM, tony.kaz--- via TowerTalk wrote:
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@gmail.com>
To: towertalk@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@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@contesting.com] On Behalf Of
Grant
Saviers
Sent: Sonntag, 25. Dezember 2022 04:47
To: towertalk@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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