It is currently, hence the iso in the old designNot unless the 24V supply is completely separate from the logic supply.
It is currently, hence the iso in the old designNot unless the 24V supply is completely separate from the logic supply.
ooh, thanks, will have to look into thisThat looks like a 2 Solenoid "MAC-Valve",
this FET-Driver should do a fine job ................
.
.
.
View attachment 290762
.
I have the manual. It looks like two valves and two coils. They can be used independently.If it works on a single coil why would they supply it with two coils?
So how is the valve returned to its default state? Spring return? Air pressure? Other?I just checked, powering only one side works fine
Its a bi-state valve. Powering one coil will take it to one state, powering the other will lead it to the other. Removing power doesn't alter states, the valve remains in the same position. No default state as suchSo how is the valve returned to its default state? Spring return? Air pressure? Other?
That suggests you could simply use the ULN2003 and power one coil from each of two outputs.Its a bi-state valve. Powering one coil will take it to one state, powering the other will lead it to the other. Removing power doesn't alter states, the valve remains in the same position. No default state as such
Agreed, however I would required 2 pins per valve, and for 8 solenoids that would be 2 whole ports goneThat suggests you could simply use the ULN2003 and power one coil from each of two outputs.
Drive the ULN2003 with a 74HC123 monostable, one half triggered on the positive going edge, and one half triggered on the negative going edge, then you have a self-timed circuit, that won't continue to take power even if your software crashes.Agreed, however I would required 2 pins per valve, and for 8 solenoids that would be 2 whole ports gone
Or for two N.O. there is https://www.mouser.ca/datasheet/2/196/pvt322a-1228593.pdfIt would be a 1 IC per valve configuration. I'll merge the inputs, and use the outputs to switch 24v on and off on each side. It has the isolation I need, plus 60VDC and 120mA on output, which is more than enough. What are your opinions on this?
For the price of one of those you can buy twenty-four ULN2003s each of which will run three solenoids, so it's 72x the price.I've been looking at a 1 Form A 1 Form B Solid State Relay. Particularly this one
https://www.digikey.com/en/products/detail/ixys-integrated-circuits-division/CPC2317N/3077531
I think this could potentially be a very good solution compared to the previous one.
View attachment 290769
It would be a 1 IC per valve configuration. I'll merge the inputs, and use the outputs to switch 24v on and off on each side. It has the isolation I need, plus 60VDC and 120mA on output, which is more than enough. What are your opinions on this?
5/2 solenoid valves usually have a spring or pilot air return so that when its de-energised, the valve returns to it's starting function.For any more help more details of the operation are needed, such as what happens when the power source is OFF, and under what conditions the valve must move and not move.
The two-coil valves in that configuration were either three-position with center closed and spring return from each side, or two position maintained..5/2 solenoid valves usually have a spring or pilot air return so that when its de-energised, the valve returns to it's starting function.
As many of us also have!I have designed many pneumatic circuits and I know what I am doing.