I have four NC valves (work) and two NO valves (exhaust - labelled "a" and "b") with everything else the same. 24VDC direct acting solenoids. Each of the four NC valves will have its own tactile momentary switch to open the valve. The motor is a Micronel U71HL with integrated electronics; also 24VDC (datasheet attached). When powered up, the motor will produce 1 CFM and all output will go through the two NO valves. When one of the NC valves is energized, one of the NO valves needs to be closed; no change in motor. When two of the NC valves are open, both NO valves need to be closed; no change in motor. When three NC valves are open, both NO valves remain closed; motor RPMs increase to yield 0.5 CFM increase in flow (1.5 CFM total now). When all four NC valves are open, both NO valves remain closed; motor RPMs increase to yield 0.5 CFM increase in flow (2 CFM total now). The system needs to work the same whether the two open valves are 1 and 3 or 2 and 4 or whatever combination. The easiest way to think about it is that there needs to be 1 CFM minimum at all times, either being used (one or more of the NC valves opened) or exhausted (through one or both of the NO valves).
My questions are whether this can be done fairly simply (if 0, then RPM 3000; if 1, then RPM 3000; if 2 then RPM 3000; if 3, then RPM 4500; if 4, then RPM 6000) or something similar? What would need to be in place to deal with the NO/NC operation? Could it be as simple as (if 0 NC, NOa and NOb open; if 1 NC open, NOa open and NOb closed; if 2 NC open, NOa and NOb closed; ...etc.)
This is part of a larger project, but I think I have the temperature control part figured out. I just need to know what is possible (and if there is a better/easier/cheaper way to accomplish that above) and how I can design a simple control system. I will have to hire someone to design the PCB and then deal with manufacturing, but at this point, I don't even know what to ask the perspective designer to design.
Thank you for any help/advice you can give me.
My questions are whether this can be done fairly simply (if 0, then RPM 3000; if 1, then RPM 3000; if 2 then RPM 3000; if 3, then RPM 4500; if 4, then RPM 6000) or something similar? What would need to be in place to deal with the NO/NC operation? Could it be as simple as (if 0 NC, NOa and NOb open; if 1 NC open, NOa open and NOb closed; if 2 NC open, NOa and NOb closed; ...etc.)
This is part of a larger project, but I think I have the temperature control part figured out. I just need to know what is possible (and if there is a better/easier/cheaper way to accomplish that above) and how I can design a simple control system. I will have to hire someone to design the PCB and then deal with manufacturing, but at this point, I don't even know what to ask the perspective designer to design.
Thank you for any help/advice you can give me.
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