adding overhead trip wire for lift

[pascal32]

pretty excited, triumph C7000 lift on order Has anyone added an overhead trip wire to either stop the lift or sound an alarm when a car is near the ceiling?

thanks!

 

[matt_i]

You can add a normally closed switch contact that inhibits the relay/contactor coil for "UP" (motor-run).

Many of the things don't use a contactor to save money. Which leads you into the conundrum of adding one or trying to find a switch rated with contacts rated for the FLA (full load amperage) of the motor.

I would try to find an IEC contactor on ebay (or new) and flow from there.

 

[Shootinok]

The two post lifts with a cross bar on top have a pretty simple switch.
Mine (Rotary) has a momentary switch with a piece of conduit sitting on top of it. the conduit is simply resting on a pin on one end and sitting on the switch on the other. If the car lifts the conduit, the switch opens and the motor stops.

 

[nadogail]

The NC switch operated by excessive travel becomes an emergency stop.

 

[bobj49f2]

My Manitowoc has the same set up as the Rotary:

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My lift is powered by 230vac 1ph. I would assume most home units are.

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[pascal32]

wow, this is an awesome forum, thanks for the response. The triumph lift is two free standing posts that don't go all the way up (like the maxjax). Adding a bar will turn into quite a bit of effort - bar would need to have minimal bow in the middle and protected as to not scratch the paint. I'm going to see whats out there for optical sensors, if not i might have to fab something

 

[pascal32]

Looked around a bit this morning, think I'm going to make an ultrasonic proximity sensor using an Arduino & place one above the car and another in the hood area. I couldn't find any simple off the shelf solutions.

 

[sweetk30]

garage door safety beam setup maybe ?

otherwise hang a conduit length from the ceiling and slip a foam insulation pad over it to protect the paint and add a switch and your good to go .

 

[matt_i]

My lift is powered by 230vac 1ph. I would assume most home units are.

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Excellent diagrams, Bob!

The 3 phase bottom diagram shows how a contactor can be included. It would need to be a version with a 240vac coil. Just erase/eliminate the L2-T2 track from the diagram and the same thing will work with single phase. The "ON" should be a momentary normally open pushbutton switch. The symbology suggests a limit switch.

 

[bobj49f2]

My Manitowoc lift uses a simple pushbutton, it must be rated for 230+ volts. There's no contactor involved.