No problem. Attached is a diagram showing how to use two relays, two activation switches and two limit switches to provide bi-directional motor control. The activation switches are "Normally Open" (NO) and the limit switches are "Normally Closed" (NC) to provide the desired results. The control lines carry 12v at whatever current is required by the relay coils (usually less than 200ma), while the motor power lines carry whatever voltage and current is required by the motor.

You can do the same thing with four SPDT switches (i.e. no relays) if the switches are capable of handling the current required by the motor with slightly different wiring. I prefer the relay-based solution, though, because it is easier to adapt to both manual and remote control situations and because you can use smaller SPST switches.

        Frank P.

On 12/16/2010 12:10 PM, neroc wrote:
Frank I have read the following section from your NG build page :-
" the elevate system shows two limit switches, which are used to
control the range of elevation. The metal dial indicator is welded to
the axle of the elevate motor and trips a double-throw switch at
either extreme."

for some time ( years in fact ) I have wanted to copy this elevate
system for my own FA piece but have never understood how it is wired ,
could you please provide a wire diagram for the electricly uneducated.

Thanks Neil R


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Attachment: Motor Control - Relays & Limits.pdf
Description: Adobe PDF document

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