Donald H Locker [mailto:dhl@chelseamsl.com] wrote:
>
> when something interrupts the beam, the current stops and my
> control logic watches for current flow. This also either stops
> the motor or raises the door if the wires to the sensors fail.
I can attest to the last part. I had a connection on one of the
sensors go bad, and the garage door refused to close - I had to
pull he "emergency" release and close it by hand until I could
repair the wiring.
If I remember correctly when installing my Sears garage door,
openers, they absolutely refused to operate if the "safety"
beams were not connected.
Tim Mullen
Chantilly, VA
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