Hello,
Can someone advise me with the attached wiring diagram please?
The diagram is for our Amada press brake foot pedal.
Wires numbered 1 through to 4 have been extended to allow them to be connected to the control box of our UR robot, but I do not know where they should be wired into. I know they should be in the digital output connections, but if someone could let me know which wire should go to which specific socket, that would be a massive help.
Thanks in advance,
Karl.
I could be wrong here, but it looks like they are just sort of T-ing off the existing foot pedal operation, which is just contact closure. ie shorting X12:1 and 2 is what happens when you press the foot pedal. By that logic, you need to connect a relay to the same wires and pick a robot output to turn the relay on. So 0v and and output on the robot would connect to the COIL terminals on your relay, and X12:1 and X12:2 would connect to the normally open contact on the relay. Then to match the rest of the wiring, 3 and 4 would go to the normally closed contacts. I’m not sure what the other contact there in the middle is, since it looks like it runs off the screen.
That’s my take on it anyway. Someone correct me if I’m wrong.
Hi Eric,
Thanks for your reply, and yes you are correct, they have T’d off the existing foot pedal.
My biggest issue is my lack of wiring knowledge, I am very much a newbie.
I basically have 4 wires (numbered 1-4) and I could do with some detail of where to “stick” them inside the control box, i.e. Digital outputs 0V, DO0, DO1 etc. You mention needing a relay, would the digital outputs represent this relay action?
Thanks again.
Here’s a very basic diagram of a relay. What happens in a relay is you apply power to the COIL and it activates a magnet. This magnet then pulls a physical connection closed. So it’s a mechanical action. Very much like an operator pushing his foot on a pedal to close a connection, or someone pushing a button to close a circuit.
So what I think you need to do here is simply short X12:1 and X12:2 together, as that’s what it looks like the original “closing foot switch” circuit is doing. So consider the relay diagram I’ve shown. The N.O. terminal stands for “normally open” and COM stands for “common.” But really it helps to look at the icons. What’s happening is when the coil is powered, the little switch inside CLOSES and shorts the “N.O” terminal to the “COM” terminal. We should see then that if we were to wire X12:1 to the NO terminal, and X12:2 to the COM terminal, that they would become shorted when the coil becomes powered. So then we ask ourselves “how do we power the coil?” Because ultimately powering the coil is what is flipping that switch. And THAT is where I would introduce your robot. Connect any 0v terminal on the robot controller to the 0v coil terminal and an OUTPUT (your choice) to the +v terminal. In this way, when the output turns ON, the coil is powered, and thus closes the circuit. If you turn the output off, the coil de-energizes and opens back up, breaking the connection between whatever you wire to the contacts.
You can get relays that have multiple sets of NO and NC contacts on them, so it’s possible to buy just a single relay and wire both the NO and NC contacts that you see on your original diagram.
For example: Omron G2R-2 24VDC DPDT PCB Relay - (CNC Specialty Store)
So your four wires that you have coming off your brake press all just land on the contacts of the relay. You need an additional 2 wires coming from the robot to the coil of said relay
Thank you Eric,
Very kind of you for all of this, much appreciated.
I’ll go and have a look at the robot and see how far I get.
Thanks again,
Karl.
