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Trefallion : Point Control


Ian Smith

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I am hoping to use Radio Control Servos to move the points and signals, so decided to part with a bit of cash and obtain a Servo Control unit and Servo from MUTR (Middlesex University Training Resources - Mindsets Online) and a couple of relays and DPDT switches.

 

Now that I have taken delivery of said electronic items I am actively trying to decide how best to make everything work. Hopefully the diagram below shows my first thoughts on how to connect everything up. The 2 resistors will hopefully give about 20% and 60% throw on the servo, although I intend using a 10K potentiometer in place of each resistor on the test bench so that I can better determine the exact level of resistance to be put in each leg of the circuit to give me the throws I require to move the point switch blades.

 

blogentry-12089-0-76297000-1313694393.jpg

 

The theory is that when current is applied across the relay (by the DPDT switch) one level of resistance will be applied, when no current is applied the other level of resistance will be applied hence giving two different amounts of throw on the servo. The DPDT switch will also control the polarity of the Point frog.

 

I'll let you all know how I get on :no:

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I'd really recommend the MERG units where you can control the throw of the servos electrically. There are a couple of threads in the p'way section here showing them used on signals. Each board can control 4 servos I believe.

 

For our club layout Slattocks we'll be trialling an 8 servo board that plugs directly into our CBUS accessory system. We went for CBUS as it had advantages over DCC accessory control and we only need 4 wires going around the layout, 2 control, 2 power.

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Thanks for your responses. I will be interested in seeing Peter's findings on the Octopus II, being able to use just one unit for 8 points would be really good - my current setup will require a separate unit for each point and signal. The MERG unit also has good write ups but you need to be a member to purchase them. If necessary I could replace the 2 resistors with 10K potentiometers which would also allow fine control of the throw of the servo.

 

I will post my findings when I get the components connected together. I wanted to make my Control Panel first (but I may put everything together as described above just to complete the test with a point).

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