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im 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? The full manual book is here

wiring digram from manual

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  • \$\begingroup\$ Hello Patrioso, the (+)(-) means "connect it one way, and the "A" port is activated." Reverse the connections, and B is activated. Ground is just that - ground. Ground is not used to control the solenoid. \$\endgroup\$ – rdtsc Nov 21 '18 at 2:43
  • \$\begingroup\$ @rdtsc so, 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? Based on this diagram, what happen if i connect paralel No 1 and No 2 to 24V at the same time? \$\endgroup\$ – Patrioso Nov 21 '18 at 2:55
  • \$\begingroup\$ No, ground is a safety connection. Ground is connected to Earth ground, and is not used at all to control the solenoid. The solenoid is controlled by the direction current goes through No1. and No2. terminals. Put the 24v in one way, and A will activate. Put 24v in reverse (swap wires to No1 and No2 termnals), and B activates. \$\endgroup\$ – rdtsc Nov 21 '18 at 11:32

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