wiring a proximity switch with motor
wiring a proximity switch with motor
(OP)
I'm trying to figure out how I can wire a motor with a proximity switch so that as the motor runs, when the proximity switch is tripped, the motor will shut off and won't start again until I flip a reset switch. The motor runs on 120 volts and draws a fairly large current. The proximity switch's rated operational current is 300mA and its no-load supply current is 1mA. I thought of using a relay along with the motor and proximity switch, but don't have enough experience to figure out what I need to do to achieve these results. Any help would be greatly appreciated. Thanks.
Davido
Davido





RE: wiring a proximity switch with motor
Davido
RE: wiring a proximity switch with motor
That just covers the details of which type of relay you need to use, but either way you will need to use a relay of some sort. The motor power goes through a Normally Closed contact of the relay, the prox controls the relay coil power. The relay seals itself in through a second set of Normally Open contacts who's power is fed through a set of Normally Closed contacts on the the reset switch, meaning that once the relay is activated by the prox, it stays energized, cutting off the power to the motor. You must then break the relay coil circuit with the reset button to allow the relay to drop out and allow the motor to run again.
RE: wiring a proximity switch with motor
Davido
RE: wiring a proximity switch with motor
Dan - Owner

http://www.Hi-TecDesigns.com
RE: wiring a proximity switch with motor
Davido
RE: wiring a proximity switch with motor
Davido
RE: wiring a proximity switch with motor
How do you plan to initiate the process? A Start / Stop Button? On-Off Switch? Some other Run signal from something else?
Is it a momentary or maintained contact?
How did you plan on stopping the process, other than the Reset button?
If someone stops it mid way through a cycle, how do you want to deal with it? Reset? Resume on restart? Require manual intervention?
How do you plan to re-initiate the process again under normal circumstances?
Does the motor return to a home position? Does it need to reverse? How would you do that? What kind of motor is it?
It sounds as though you are a neophyte on control systems, you may want to ask for help from someone experienced who can see your system and understand your application. I know you probably think this isn't hard, but it is a little more complex than you may have originally imagined. This forum is for working engineers in a particular field to share ideas, it is not supposed be a substitute engineer for someone working in another field. Sorry.
RE: wiring a proximity switch with motor
Davido
RE: wiring a proximity switch with motor
How this works is the latching relay (having two coils) is in the normally closed state and one coil of the relay is connected in series with your prox switch. On prox switch closure, the relay contact "latches" to open turning and keeping the motor off until such time as the other coil of the relay is activated by a manual momentary contact switch which restores the relay to its former closed state, restoring the motor "on" state.