Hi folks,
I'm working on a model for a water distribution system that has two different operational modes. The equipment operates on different set-points in each operational mode. There are two pressure zones in the system: Zone 1 (with the water treatment plant pumps), and Zone 2 (with the booster pumping station pumps). The two operational modes are as follows:
-Booster station lag configuration: water treatment plant pumps are leading.
-Booster station lead configuration: booster pump station pumps are leading.
The system operates in the booster station lag mode until a tank level in zone 1 reaches a certain elevation upon which time the system switches to the booster station lead mode. In the booster station lead mode the equipment runs on different set-points until the level in a different tank drops to a certain elevation upon which time the system switches back to the booster station lag mode.
What I’m wondering is if there is a way to enter this kind of complex operational modes in to the model?
Thanks in advance
Andrew
Pick an element (i.e. pump, storage tank, etc.) and then click on controls. In the controls you can setup if then statements based on the conditions you want (i.e. elevation, flow rate, demand, etc.) In the help section, there is a discussion about setting up controls that I think gives an example.
err that should be right click on the element, select properties, then controls
My question is not how to set up a control. It's how to set up different operational modes. The elements in the model have multiple conflicting controls depending on if the system is in one operational mode or the other. What I'm wondering really i guess is can you assign different operational modes in the same scenario which are triggered to change with some model parameter like tank level?
For example we start in BPS lag configuration to fill up Tank 1 in Zone 1. Once the tank is almost full, the system switches to the BPS lead mode. Now all the equipment has different controls and the level in tank 1 will draw down to feed zone 2. Now once a different tank level drops to a certain level the system reverts back to the BPS lag configuration and all original controls are once again valid.
Maybe you can do it with a bunch of complex if statements in the controls but I have been trying to figure that out and it's not obvious. It would be much easier if i could set up different operational modes/control sets for it.
There is something that differentiates mode 1 from mode 2. You need to include that condition in the composite condition that will trigger certain actions. You can end up with some complicated conditions like
IF(TNK-1<80.AND.PMP-2=Off.AND.TNK-3<120) THEN
Think things through very carefully before you start laying out controls.
After you setup your controls and conditions, there should be a fourth tab called control sets that will allow you to setup your modes. I think this also will allow you to set hierarchy as well (i.e. logic condition 1 before logic condition 2 etc.)