Point motors

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Fairlie

Registered
I have an Aristocraft electric point whose motor is unreliable, and needs changing. Would an LGB motor fit the Aristo point?
The Aristo motor operates by two wires, and reversing the polarity reverses the point. An internal limit switch cuts off the power at the end of its travel. Is the wiring for the LGB the same, or would I need three wires?
 
LGB would fit Aristo points, the wiring is simply two wires from the control box to each point motor.. :thumbup:
 
I use LGB point motors on all my Aristo points. Some need a small filler piece glued on to ensure switching,a 2 minute job.
Two wires and seriously reliable :bigsmile:
 
Thanks, Phil and Colin. I'll look for one on Fleabay, unless someone has a spare one they would like to sell me.
Malcolm.
 
Altough the LGB motor will fit mecanicaly it sounds as if the aristo one works slightly different.

LGB motors only require a short impulse of power to operate, and have no limit switches inside these are a seperate unit mounted externaly to operate accesorys.

I have no idea if the ariso ones are constant feed and that the switches switch off the supply to the motor when it reaches end of stroke.....Best check first:thumbup::thumbup:
 
I'm still struggling here. I read that the LGB point motors use AC, whereas the Aristo ones use DC. Reversing the polarity reverses the points. I can't see how a two wire reversing system would work using AC. Am I being a bit dense here?
 
LGB motors require half wave rectified ac, effectively pulsed dc. You can use short pulses of dc too, I use this in the form of an output from a cdu (capacitor discharge unit). The polarity is reversed to throw the motor the other way. If you're using an ac supply all you will need (per point) is a spdt centre off switch and 2 diodes or if you're using dc a centre off dpdt switch wired as a reversing switch. Be careful not to keep the power applied for too long or the motor will release it's magic smoke.
Scroll on here for the diagrams for ac http://www.gscalecentral.net/tm?m=86693&high=point+motor+control < Link To http://www.gscalecentral....gh=point+motor+control
 
Fairlie said:
I'm still struggling here. I read that the LGB point motors use AC, whereas the Aristo ones use DC. Reversing the polarity reverses the points. I can't see how a two wire reversing system would work using AC. Am I being a bit dense here?
Click to expand...
LGB point motors will work on DC, but lower the voltage to about 6 volts. I used mine through a DPDT center off switch (double pole, double throw) and wire it in reverse, that way when the switch is operated, it sends the current opposite ways. Always return to center off though or you could warm your point motors. I did that a few times, but it never damaged any
 
Thanks. I was being a bit too literal in my mental definition of AC. To me, half wave rectified is DC with a bit of AC ripple thrown in. My existing passing (momentary) contact reversing switch should work fine, using DC. Thanks for the tip about reducing the voltage though.
 
I've started converting some of my switch machines to these, http://www.train-li-usa.com/store/masterline-switch-drive-with-latching-relay-p-67.html
I found that as good as they are, my LGB switch machines were not always 100% reliable. I was at a point where I would need two switch machines to throw the points of a switch all the way. The Boehler machines are slow motion and work with the EPL controls. And they are priced right. Axel made me a deal when I purchased them in quantity. Now I am a happy camper.
 
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