[TowerTalk] Emotator Rotator

[Michael Tope]

Roger,

I put a copy of the 1105MS manual here:
https://www.dropbox.com/scl/fi/jzjniuq425499w8bgk790/Emoto1105MSAX_Manual.pdf?rlkey=fkj5exoj2h8pv0yszcjj08e9l&dl=0

The simplified schematics on page 9 appear to incorrectly show that the 
motor windings for MSX and MXX controllers are connected across the 
mains input instead of the transformer secondary. This makes no sense 
since the motor is supposed to run on 24VAC.

Here a marketing brochure with a table listing the specs (including 
operating voltages) of the various Emoto rotators:
https://www.dropbox.com/scl/fi/dzmum1qemifbj8dpi5jx0/Emoto-Rotator-General-Info.pdf?rlkey=l7i5j8kgdvcx11o103wsy26va&dl=0

Joe W4TV is correct that several units use a 100 VAC motor voltage. The 
1105 series rotator uses a 24VAC motor. Per the parts list in the 1105 
manual (page 11), the startup capacitor is 100uf.

Hope this helps.

73, Mike W4EF.................

On 2/9/2024 1:15 PM, Roger Parsons via TowerTalk wrote:
> I have been using an Emotator rotator and 1105MS controller for quite a few years, generally successfully. However, for the past several years it has not rotated when the temperature has dropped below about -10C.
>
> My first thought was to put in low temperature grease, especially as this had not been changed for many years.This made zero improvement. I then wondered if the connections had gone high resistance. Measurements indicated that they had not, although I wasn't able to measure the resistance of the connector on the rotator. I parallelled several wires in any case, but this also made zero improvement.
>
> Information on Emotator is very sparce, but this one uses 28V AC and the rotator has two windings with a common point. Voltage is supplied between the common point and either one of the windings. There is a capacitor (of unknown value) between the two directional inputs. My latest thought was that perhaps this capacitor was faulty. Looking at the waveforms on each of the inputs show that they both have sine waves (of the same amplitude) with about a 90 degree phase difference, and that this phase difference is reversed when direction is changed. This seems correct to me, but I would much appreciate any other thoughts.
>
> Because I've run out of ideas! Of course, I can't actually do anything about it for several months until Northern Ontario gets a little warmer.
>
> 73 Roger
> VE3ZI
>
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