[JandS]

 4 or 5 times today while water was running through brush it tended to fade in pressure and even stopped a couple of times.
When it's making that noise when deadending does 3 or 4 normal ones then noise fades for a couple of beats doesn't seem as strong when d/e....is it pump or controller? Hopefully pump because I have a spare.

[JandS]

Any ideas?

[Richard Groves]

Calibration perhaps ?

[Smudger]

Re calibrate first

Then

Check battery charge

Finally check fuse for corrosion and any loose wires

Darran

[JandS]

Calibrated fine battery showing 12.8....I changed the fuse last week as I connected the black and red wires the wrong way for some reason.........see how it runs today.

[Ian Sheppard]

4 or 5 times today while water was running through brush it tended to fade in pressure and even stopped a couple of times.
When it's making that noise when deadending does 3 or 4 normal ones then noise fades for a couple of beats doesn't seem as strong when d/e....is it pump or controller? Hopefully pump because I have a spare.

As Above comments it is most likely to be that the Cal value is to low for the  flow rate set and the pump is being cycled On and Off.
The controller can be calibrated at any flow rate, ( guide mentions flow of 30 only to give a common start point) A suggestion is to set the flow rate to the one you use most of the time and then run Autocal . This will help ensure the cal value best matches the flow rate used.
While in DE the controller tests the pump every three seconds to see if valve has been opened again and teh pumps needs to start. This micro DE retest will blip the pump for a 100th of a second and that is the sound your hearing. This DE retest means that once the valve is opened again the longest it will take for the pump to restart is 3 seconds. With the New V16 controller the DE micro test is every 2 seconds .

I also noted the comment regarding the battery. Toward the end of a working day if the battery is getting a little low the battery might struggle to supply enough current to the pump. Also note today the voltage is 12.8v A sign of a worn battery is the voltage drops a lot suddenly. A good condition battery will show a slow voltage fall over the day as battery capacity drops. A worn battery will see Volts drop suddenly For example 12.8v to 12v over a few minutes.

That said reading the post it is most likely to be that Cal needs to be a little higher to match flow rates.

Cheers
Ian

[Ian Sheppard]

It is worth covering why the controllers have DE calibration.

In short the controller needs a way to know when a pole valve has been closed so it can stop the pump well before the Pump pressure switch has too. Without giving away to many secrets the controller is looking at how hard the  pump is working and how that changes to know when to DE the controller or not. In open flow a pump will draw a consistent amountif power from teh battery

When a valve is closed two things happen 1. Pressure builds up behind the closed valve. 2nd The pump tries to push against the valve and has to work harder. It is these changes the controller sees and will Dead end the dead end the pump as above during DE the controller retests the condition so it knows when the valve is open again.

The higher the flow rate the harder the pump works and the higher calibration value needs to be and the lower the flow rate the lower cal will be. For this reason it is best to run auto calibration at the Flow rate used most of the time.

If cal is to low then the pump cycles On/Off - If cal is to high the controller can be slower to DE the pump

[JandS]

Got it..... I was running flow rate at 80 and set calibration at 45 and it worked fine.....then I find you can auto calibrate and it was auto calibrating as low as 27 the other day which I think is the problem......back to 45 tomorrow should see an end to problem.