Neal Scherm wrote:

Here is the flap circut from Chuck Dunlaps RV6. I added up and down limit
switches, but it is the simplest circut I've found. The diodes across the relay
coils absorb the inductive spike and extend the life of the switches.

Chuck Dunlap replied:

The limit switches won't work with this circuit. Once they open, the motor
cannot be actuated again unless the limit switches are shorted. My circuit works
with Van's motor because it free runs at the end of its travel without hurting
anything, so it doesn't need limit switches. If you have a mechanism that would
bind at end-of-travel, you will need limit switches and a different (more
complex) circuit.

Russell Kent wrote:

Eh?  Not the way I read the circuit.  There are two limit switches, and each
switch interrupts only half of the direction of travel.  For example, assume that
the lefthand push button is the "flaps up" button, and the righthand limit switch
is the corresponding "up limit reached" switch.  Push flaps up, current flows from
+12VDC through the righthand limit switch, the righthand NC relay contact, the
motor, the lefthand NO relay contact to ground.  Once the flaps reach the
righthand limit switch, the motor stops.  Now push the righthand "flaps down"
button.  Current flows: +12VDC, lefthand "limit down" switch, lefthand NC relay
contact, the motor, righthand NO relay contact to ground.

Did I miss something?

Russell Kent

No but you need to mention the limit switch closes again. I think
that is what put Chuck off and me for that matter.

Paul Lamar
 
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