A Fresh Engineer (Customer) asked a question.
I bought a E-Stop Station, specifically the IDEM ES-P-230002 3 N.C. e-stop station.
The wiring diagram for this E-stop is here.
I want to hard wire this e-stop to the power supply of my I/O devices. Not sure if this is the best way to do it. Stopping flow to the power supply for the I/O devices seems like the best way to cut off power from all of my devices. If I have my ground, positive, and negative wires running to the 3 e-stop contacts and from the e-stop contacts to the power supply, if I push the E-stop buton while the powersupply is on will this E-stop disconnect the ground, positive, and negative? or will it do the opposite and connect them?
If I want the powersupply to not have power anymore when the e-stop is pushed would I want to get a 2NC and 1 NO?
NC safe contacts are shown usually in a 'safe' condition, that is the contacts will be closed when the button is in its reset / not pressed state.
I'm a little confused with your terminology, because the AC input to a DC power supply will be "Hot", "Neutral" and ground, not Positive and Negative. Positive and Negative will be the DC output. Also, be aware that breaking AC power to the power supply may not instantly remove its DC output power.
I was the confused one, my bad. I meant to say put the E-stop on the DC side of the power supply, powering all my IO devices
You really only need one of the three contacts to break the DC voltage from the power supply. Just run from the +DC out on the power supply to the e-stop switch (any one of the three) then from the other side of the switch to your I/O devices.
If there are 2 +DC out on my power supply, can I wire both to separate contacts on the e-stop switch? I want to power different devices to each contact, if I only use one contact I would have more than 3 devices on one contact used to power them which is not good, can I use 2 contacts separately like on the power supply? If I only use one contact, is it okay to wire more than 4 devices to the same contact?
Another thing to note is you should never break a ground with a push button or relay. The ground is there to ensure that whatever is grounded can't become live. An example is an old electric drill with a metal case if somehow the live wire in the drill shorted to the case it would electrocute whoever garbed the drill If it wasn't grounded. if the drill was grounded it would just pop the breaker or fuse as it would be a direct short to ground.
I already connected my DC+ output from my power supply to the e-stop, then from e-stop to DC+ on my solenoid and also other devices. I tested it out and the e-stop worked, but now I see that the contacts are not rated for DC? Would it be bad if I kept running the DC current through the e-stop? My only other option now is to connect the power supply AC side to the e-stop and the e-stop connected to a power outlet. Only thing is that when I press the e-stop it will take a couple of seconds for the DC in the power supply to stop supplying power to my devices.
I have not calculated exactly how much current for everything, but it will be close to 2.5A and maybe more, I might need to buy another power supply. Not sure how I will connect the E-stop to 2 power supplies.
in my industrie E-stop buttons are generally used with either a safety relay or safety PLC input.
https://www.automationdirect.com/adc/shopping/catalog/safety/safety_relay_modules/2-channel_e-stop_-z-_safety_gate_relays#sort=&start=0
Most of the time in my industrie ether the safety relay or a safety PLC output will energise a force guided relay we use a lot of Allen Bradley 700S force guided relays but i am not seeing an automation direct equivalent but this would be the closes
https://www.automationdirect.com/adc/shopping/catalog/safety/safety_relay_modules/force_guided_relays#sort=&start=0
Yes sir!
How much current is everything going to draw? The contacts are not DC rated
https://cdn.automationdirect.com/static/specs/idem3pestops.pdf
Normally I never power anything directly with an E-stop button except an AUX contact to A PLC input for troubleshooting purposes. Normally I use an E-Stop relay to monitor normally closed contacts of all the E-stop buttons in a machine in series and use its output to interrupt power
https://www.automationdirect.com/adc/shopping/catalog/safety/safety_relay_modules/2-channel_e-stop_-z-_safety_gate_relays#sort=&start=0