Martin,
Many years ago I was faced with a similar situation with my medium sized
Telrex rotator.
After much thought I came up with a solution using a mostly gutted
HyGain Ham4 rotator (mounted under the mast drive sprocket) and a
modified HyGain control box.
See:
https://app.box.com/s/w55jzicmz24ual5inzgkgxapo71p7f8c
for a note about it and my original Telrex manual, such as it was!
-Steve K8LX
On 11/16/18 0:04 AM, Martin Sole wrote:
Hi,
I'm restoring a Telrex A3695RISX rotator. It's quite a monster but if I
can figure out a way to use it I think it's unlikely I would ever need
anything bigger, 1/3hp reversible AC motor, dual worm reduction gearbox,
chain drive to 3" output shaft and it weighs about 125 lbs, around 57kg.
I have no control box which poses a small problem. Wiring to the motor
is straightforward enough though I think the limit switch arrangement
could be handled better.
It uses a selsyn for position indicating. In this case actually a
General Electric Selsyn Control Transformer 2J161. This is marked
57.5-57.5 V 400CY. The device is working in that I can get the three
outputs from the stator winding when I excite the rotor winding, all
three stator outputs rise and fall with rotation so I'm pretty sure its
good.
The problem is what to do at the other end. Without a matching selsyn,
not something I expect to ever turn up around here, I am wondering how I
might be able to take the selsyn outputs and interpret them by some
other means. My understanding is the 3 stator outputs are AC voltages
varying in amplitude and with a fixed phase relationship in order to
produce an unambiguous value related to absolute position. I'm not 100%
on this yet though. They are in a delta configuration though so I'm
thinking anything I do first needs to make them Y configured
What are my options?
I had thought about an I2C compass module but that will entail placing
some other conversion hardware at the rotator to convert to something
like RS422. Any other thoughts. Just looking for ideas to think of what
might work well enough. Ideally keeping the selsyn as it's all purpose
built around that.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|