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Re: [TowerTalk] Emotator Rotator

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Emotator Rotator
From: Michael Tope <W4EF@dellroy.com>
Date: Fri, 9 Feb 2024 15:36:43 -0800
List-post: <mailto:towertalk@contesting.com>
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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