capocoreyollo
Aluminum
- Joined
- Jul 22, 2015
Hello all,
I'm having a weird issue with some solenoid valves in a simple hydraulic circuit, let me try and describe the situation as best as I could..
So coming out of a 2 station manifold, I have 2, 4 way, spring return, center drain valves. 120VAC, controlled through relay outputs by a PLC. Each valve controls a set of cylinders, A position down, B position up. Wired up such that 1 leg of each coil jumped together to my 120VAC control, the other 4 legs to their corresponding PLC output.
Initially, I had valves with a center position, A&B drain to T, P blocked. Everything worked correctly from a controls standpoint, only problem was when both valves were "off", I was holding at full pressure (~1700 psi)and building up alot of heat.
So I swapped out the valves for center position, A to B blocked, P drain to T. Wired up exactly the same as before. Now when I actuate, lets say, valve 1, side A, nothing happens...until I actuate valve 2 side A, then cylinder on valve 1 actuates, as well as the cylinder on valve 2. Electrically everything is right when I check with a meter, program is running as it should as well. So that leads me to believe that somethings going on hydraulically.
This is the manifold im using....
McMaster-Carr
And my Motor/tank/pump......
McMaster-Carr
Original valves
McMaster-Carr
And the ones I changed out for
http://www.eatonpowersource.com/products/configure/industrial-valves/details/02-145150/#/h:80694/s[1]G4V/s[2]:-3/s[3]:S/s[4]:-8/s[5]:C/s[9]:-VM/s[11]:-FW/s[14]:-B/s[15]:5/s[16]:-61/s[22]:_
Anyone have any idea whats going on? It seems like when I have one valve, P going to A and the other "off" (P to T) that I might have to much pressure going to tank, preventing B to T thus keeping my cylinder from moving?
I'm having a weird issue with some solenoid valves in a simple hydraulic circuit, let me try and describe the situation as best as I could..
So coming out of a 2 station manifold, I have 2, 4 way, spring return, center drain valves. 120VAC, controlled through relay outputs by a PLC. Each valve controls a set of cylinders, A position down, B position up. Wired up such that 1 leg of each coil jumped together to my 120VAC control, the other 4 legs to their corresponding PLC output.
Initially, I had valves with a center position, A&B drain to T, P blocked. Everything worked correctly from a controls standpoint, only problem was when both valves were "off", I was holding at full pressure (~1700 psi)and building up alot of heat.
So I swapped out the valves for center position, A to B blocked, P drain to T. Wired up exactly the same as before. Now when I actuate, lets say, valve 1, side A, nothing happens...until I actuate valve 2 side A, then cylinder on valve 1 actuates, as well as the cylinder on valve 2. Electrically everything is right when I check with a meter, program is running as it should as well. So that leads me to believe that somethings going on hydraulically.
This is the manifold im using....
McMaster-Carr
And my Motor/tank/pump......
McMaster-Carr
Original valves
McMaster-Carr
And the ones I changed out for
http://www.eatonpowersource.com/products/configure/industrial-valves/details/02-145150/#/h:80694/s[1]G4V/s[2]:-3/s[3]:S/s[4]:-8/s[5]:C/s[9]:-VM/s[11]:-FW/s[14]:-B/s[15]:5/s[16]:-61/s[22]:_
Anyone have any idea whats going on? It seems like when I have one valve, P going to A and the other "off" (P to T) that I might have to much pressure going to tank, preventing B to T thus keeping my cylinder from moving?