AquaMist pump (was: Re: Voltage controller)

[John Andrianakis]

Looking at the MF-2 installation manual I can see that the pump has a 3 pin 
connector. Pin 1:+12v, pin2: control pin, pin 3:ground. From the diagram 
and the test description I think that the control pin is used to limit the 
maximum pump pressure. It is connected to ground through a pressure 
switch.When the control pin of the pump is grounded the pump doesnt work.
 This switch is located on the "water valve manifold assembly" which 
"serves as an electro-mechanical valve for control of water flow". The PWM 
signal of the MF-2 goes to the solenoid valve on the water manifold 
assembly.
I hope I am not missing something out.
Regards,
John Andrianakis.


On Monday, March 08, 1999 9:50 PM, Daniel Houlton 
[SMTP:houlster at user2.inficad.com] wrote:
> John Andrianakis wrote:
> >
> > Havent followed all the messages of this thread but I think you should 
know
> > that erl does not alter the water output by changing the pump supply
> > voltage. They use a solenoid valve controlled by their MF-2 injector
> > controller. The pump is specialy designed magnetic piston unit and I 
could
> > guess that it operates at a frequency of around 10Hz.
> > Regards,
> > John Andrianakis.
> >
>
> Just to clarify, I'm not trying to modulate the supply voltage that 
powers
> the pump.  I'm trying to control the voltage level to the 0 - 12V signal
> input (this is seperate from the 14V power input).  This appears to be 
what
> the MF-2 does.  Sends a variable voltage 0 - 12V depending on how much to 
> pump and the internal circuitry of the pump does it's thing to pump that
> amount, most likely PWM'ing the 14V power supply itself.
>
> I'm assuming that it's linear as well.  0V => no pump, 6V => 50% d.c.,
> 12V => 100% d.c. etc.
>
>
> --Dan