Hi 
, I'm buying [smc VQZ 212 5YZ1 C6] 3 port solenoid valve with 2 possible position(let say A and B).
This solenoid work with 24VDC and have 3 pin/ wire. There is No 1, No 2 and GND pin.
I will never tried to wiring directly without enough information.
How to switch the solenoid valve position (from A to B and from B to A) with 2 wire 24V adapter (24V and GND)?
What does (-)(+) mean in wiring diagram? (See picture attachment)
The full manual book here
In the context of those drawings, it means plus OR minus, (polarity does not matter). If you are not going to switch polarity, you only need a free wheeling diode across each valve coil with cathode (end with stripe) toward plus (+). What does this have to do with Arduino?
As mentioned and if you do want to reverse polarity you need the varistor as shown.
The LEDs are just for polarity indication/solenoid position.
You can simply reverse polarity with a DPDT switch/relay and your 24VDC supply.
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outsider:
In the context of those drawings, it means plus OR minus, (polarity does not matter). If you are not going to switch polarity, you only need a free wheeling diode across each valve coil with cathode (end with stripe) toward plus (+). What does this have to do with Arduino?
I forgot mention arduino.
I want to generate fast switching using arduino 30 Hz PWM(using pwm manipulator to generate low freq.). But to do this i need knowledge how this solenoid work.
Is L298N driver compatible to do this?(changing the polarity frquency instead of changing voltage frequency)
larryd:
As mentioned and if you do want to reverse polarity you need the varistor as shown.
The LEDs are just for polarity indication/solenoid position.You can simply reverse polarity with a DPDT switch/relay and your 24VDC supply.
I think my solenoid has built in led and varistor.
So what i understand is always connect gnd to gnd. if i want to position A put +24V adapter to NO. 1 and leave NO 2 without any wire. And for position B put +24V to NO 2 and leave NO 1 without any wire? Is this what you mean?
That wiring scheme appears to me to be a generic connection that is used by many different models of their product. Some variants have LED(s) or neon indicators fitted.
If the signal is applied to pins 1 and 2 with a certain polarity, then one of the 2 LEDs will illuminate. If the signal is applied with the opposite polarity then the other LED (which may be a different colour - but not specified) will illuminate.
As far as I can tell your solenoid will function in exactly the same manner with either polarity.
There may be other products which operate in different modes according to the polarity of the signal, the two LEDs could then be used to indicate which mode is selected.
The third connection is for a protective ground connection, and is probably only present because you have the DIN connector variant, as indicated by the letter 'Y' in the part number. It's use would be more necessary if you had one of the 100V AC to 220V AC coil types.
So make your connections to pins 1 and 2, with the protective ground optional.
