Level sensor to control main pump- Prog. logic??

[H20ENG]

I have 3 optical sensors.
Sensor 1 controls ATO and is working correctly.

I need sensor #2 to detect a low sump level and shut down the main pump for 30 minutes, and send an alarm.

I need sensor #3 to detect a high display tank level and shut down the main pump for 30 minutes, and send an alarm.

The reason for the timer is so the pumps may restart themselves if nobody is there to clear the alarm. If the problem persists,as in a drain is clogged, the pump will shut itself down again for 30 minutes.

Another reason for the timer, once the pump shuts down, the tank level or sump level will return to a normal state (as far as the sensors are concerned), and would restart, causing short cycling and pump motor burnout.

So, I went to programmable logic and set Water 2 ( since I want to program Sensor 2) to Inverse, since it is normally wet. I chose NOT logic since I want to disable the Filter socket. Where do I go from here?? Am I on the right track??
Kidney?

 

[H20ENG]

I am having the same issue as jdrabek (below). I found that by setting the main pump socket to Prog logic 1, level sensor 2 to ATO, prog logic 1 to water 2, delayed on, inverse. It will do what I need it to do. BUT the time overdue alarm will hold the proccess until manually reset. This is bad. Even when set to 0:00 it will just latch itself off.

<a href=showthread.php?s=&postid=13895401#post13895401 target=_blank>Originally posted</a> by jdrabek
Any ideas on setting the logic so water level alarm does not go off.

I am trying to use float sensor to shut off main pump when there is a low water condition. Float has to work in reverse. When it is up that would indicate correct water level and when it was down it would mean a low water level. We are getting close because I can get the sensor to work the socket correctly, but I can not get the alarm to work in reverse. Was told:

Input 1 filter

AND

Input 2 water level 1

I don't see how this logic is telling it not to alarm. Any other thoughts.

 

[H20ENG]

OK, playing further with prog logic.

I sort of solved the timeout issue, but its still not safe, IMO. As long as the timeout is longer than the delay, it should be OK, so long as the sensor gets wet before the timeout. If not, then the pump STAYS OFF until manually reset, and the tank potentially dies.

On to the next step:
I need both level sensor 2 (low sump) and level sensor 3 (high tank) to control the same socket (main pump).

So, I set Gate 1 as OR:
Input 1 is Water 2 inverse, water 2 set as ATO.
Input 2 is Water 3, water 3 set as leakage

Then Gate 2 is set to Delay ON for socket 10 (main pump). Socket 10 set to Prog Logic 2

So this works with level sensor 2, but I cant get it to work with level sensor 3. I've tried inverting the logic, changing from ato to leakage, etc to no avail.

Any thoughts??

 

[H20ENG]

More info:

Level sensor 3 goes into timeout alarm within 3 seconds of touching water, regardless of the max on-time, sensor reaction time, or sensor operational mode. I swapped sensors to doublecheck, and its only sensor 3. This is creating even more confusion and frustration.

I'll re-read the book tonight...

 

[H20ENG]

I read that when set to Leakage, there is no time monitoring, it just locks in immediately.

Michael, Mattias, or Kidney? Am I chasing my tail wanting this function? Is this possible with this system?

I could use the level sensors 2 and 3 for auto DI makeup (not topoff but refilling the DI storage tank when low) using min / max.

Then build a relay controller/ alarm out of floats and a timer relay. But I'd rather the alarm go through the profilux directly and turn off the filter socket.

Thanks all!
Chris

 

[H20ENG]

OK, I went back and read up on my logic functions (been too many years), and with Lorins (Kidney) help, we figured it out.

I changed my ATO to water 3.

So water 1 is High tank level, water 2 is low sump level.

In programmable logic,
Gate 1 is NOR, inputs are water 1 inverse, and water 2.

Gate 2 is Delay ON, 30 minutes, input is Gate 1

Level sensors are set to ATO. Level 1 is set to max on time 0:00:00 which disables the alarm, very important to prevent max on time timeouts and manual resets.

jdrabek, I believe that will solve your problem as well

Now to somehow get the alarm when Gate 1 is active....

 

[jdrabek]

Lorin and I got it to work, but not exactly like yours.

Logic is: Gate 1 and filter , water 1(inverted)

Also, timer was set to 0.

This does not allow you to set up and alarm though. Still would like to see that capability in the logic, but I have not spent any more time on it. It does shut the pump down when the sump level gets low, it just does not tell me it did it.

 

[H20ENG]

10-4. Thus this statement "Now to somehow get the alarm when Gate 1 is active...."

My big problem was the timeout alarm while in normal state, and that solved it. I'll let you know if I find anything else.