Limiting pump run time

[wolf pup]

Is there a way to limit the time my ato pump (doses kalk) can run?

will "max change ATO 002 ON" do this? I thought that would force the pump to run no less than 2 minutes but just want to make sure.

I use a "max change ATO 030 OFF" to shut it down for 30 min should the ph get above 8.5 to limit kalk dosing

what I want to do is if the float switch closes (low water) the ato pumps kalk top off into the tank, but if top off reservoir is empty, I want the pump to run no more than 2 minutes before shutting down.

 

[aquamanic]

No, the Max Change prevents an outlet from changing state for at least x time but does nothing to limit the time the outlet can run.

To do what you want you have to create a virtual outlet. That virtual outlet turns 'ON' when the physical outlet you want timed turns on. However, also in the virtual outlet is the Defer statement which actually prevents the outlet from turning ON for x amount of time. As soon as the virtual turns ON then you know your physical outlet has run for x amount of time and you turn it OFF. Sounds worse than it is.

[new virtual outlet]
Set OFF
If Outlet ATO_Pump = ON Then ON
Defer 120 Then ON

[ATO_Pump]
Set OFF
If Float_switch = OPEN Then ON
If Outlet Virtual_Outlet = ON Then OFF

Test that first. I typed it off the top of my head!

 

[swearint]

Alan, from the syntax, it looks like he is running pre-Apex controller. I am not familiar enough with the programming to make any suggestions, but KenArgo has code examples that may be of assistance:

http://www.kenargo.com/questionsAndAnswers/index.php

Todd

 

[aquamanic]

You're right. I just assumed Apex but it does look like an AC. So Wolf Pup there's a step before mine - you have to buy an Apex! :crazy1:

 

[wolf pup]

Thanks guys...you are right, it's pre apex. Kenargo didn't have anything on the example page but you may have pointed me in a direction that will work. I just have to test run the logic but I'm thinking that a dummy timer can trip on on the initial switch closed condition, be held on for two minutes, have its state checked each cycle and be used to create a "hold" event. Although I'm not sure I can do it without an "and" Maybe I should just jump off the Apex cliff. Perhaps next holiday season. Seems a bit of overkill for a 30 cube however

 

[aquamanic]

Just get a bigger tank. Problem solved!