I have managed to get myself completely confused trying to understand selector switches. I'm hoping somebody can shed some light. I'm planning to use the metal Automation Direct switches linked below.
This is what I think selector switches are doing (or at least this brand). If the switch (2 position or 3 position) is turned to the side the contact block(s) is attached too, then that contact block goes from it's 'Normal' state to the opposite (NO -> Closed; NC -> Open). In a 3 position switch the center position activates no contacts, hence they are all in the 'Normal' state (NO or NC). Is that right?
In my circuit, I have simple 2 position maintained selectors for the pumps (e.g. on/off). I'm intending to use the GCX1252-120L switches. So far so good. I need two circuits per switch that toggle between [O-X] and [X-O] to handle the pump and the interlock circuit so only one is ever closed at the same time. If so, I believe I need two of the same (NO or NC) -- or I could stack a NO and a NC on the same side (if physically possible)?
This is what I think selector switches are doing (or at least this brand). If the switch (2 position or 3 position) is turned to the side the contact block(s) is attached too, then that contact block goes from it's 'Normal' state to the opposite (NO -> Closed; NC -> Open). In a 3 position switch the center position activates no contacts, hence they are all in the 'Normal' state (NO or NC). Is that right?
In my circuit, I have simple 2 position maintained selectors for the pumps (e.g. on/off). I'm intending to use the GCX1252-120L switches. So far so good. I need two circuits per switch that toggle between [O-X] and [X-O] to handle the pump and the interlock circuit so only one is ever closed at the same time. If so, I believe I need two of the same (NO or NC) -- or I could stack a NO and a NC on the same side (if physically possible)?