Im looking into parts to buy for a project I have on my hands, I think I have somewhat of a handle on things but I want to be sure before I start ordering stuff.
First the what: My first step in this process is to get a plc and some parts in hand to make a simple circuit work. I currently have a fairly large machine with 2 electrohydraulic actuators centrally located on either side of the machine. Controlling the actuators I have 2 up/down pendant stations on opposite corners of the machine so it can be operated from either side. This system is run with 24V and the EHAs pull around 40A when maxed out. I have 24v running into the machine and a mess of wires running from side to side of this machine with a couple relays controlling the motors. The system is wired up and running currently but I would like to put in a PLC so that I can add some logic points in at a later date.
My first goal is to get a PLC and some contactors to recreate the current situation: push up on either side and it goes up, push down and it goes down..
I think I have the contactors down to a couple Allen-Bradley 100-C72DJ10, one for up and one for down. I am thinking it could be wired as follows:
One thing that I'm having trouble with is figuring out witch type of PLC to get.. Sinking vs. Sourcing.
I believe that I want sinking in order to keep amps away from the PLC?? Or would it not really matter at this point because the only circuit that would really be running through the PLC is the pushing of a button in order to trigger the contactor coil?.
First the what: My first step in this process is to get a plc and some parts in hand to make a simple circuit work. I currently have a fairly large machine with 2 electrohydraulic actuators centrally located on either side of the machine. Controlling the actuators I have 2 up/down pendant stations on opposite corners of the machine so it can be operated from either side. This system is run with 24V and the EHAs pull around 40A when maxed out. I have 24v running into the machine and a mess of wires running from side to side of this machine with a couple relays controlling the motors. The system is wired up and running currently but I would like to put in a PLC so that I can add some logic points in at a later date.
My first goal is to get a PLC and some contactors to recreate the current situation: push up on either side and it goes up, push down and it goes down..
I think I have the contactors down to a couple Allen-Bradley 100-C72DJ10, one for up and one for down. I am thinking it could be wired as follows:
One thing that I'm having trouble with is figuring out witch type of PLC to get.. Sinking vs. Sourcing.
I believe that I want sinking in order to keep amps away from the PLC?? Or would it not really matter at this point because the only circuit that would really be running through the PLC is the pushing of a button in order to trigger the contactor coil?.