Hello there,
i am trying to get some rules for pumps to work on a drainage model i'm working on.
the topology is: 3 separate parts of a drainage network are connected to a detention pond. the pond is a storage tank and there are 3 identical pumps that pump water out of the tank and to a higher level...
The pump network is controlled by a microprocessor that uses as inputs the water level (DEPTH) in the tank, but also the INFLOW of water to tank...
using control rules i checked the manual and used the following conditions for the switch ON (these are the rules for pump 2. pumps 1 & 3 are identical)
Quote:
RULE PS2_P2.2.1
IF NODE Pond-2 DEPTH >= 2.80
THEN PUMP Pump-2.2 STATUS = ON
RULE PS2_P2.2.2
IF NODE Pond-2 INFLOW >= 1.5
THEN PUMP Pump-2.2 STATUS = ON
RULE PS2_P2.2.3
IF NODE Pond-2 DEPTH <= 1.6
THEN PUMP Pump-2.2 STATUS = OFF
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the DEPTH condition is working properly both for the switch ON & OFF... (note that the Pond-2 element is a detention pond and NOT a junction... but i take it this is not a problem)
what does not work properly is the INFLOW condition. what am i doing wrong? the units in the conditions are the same as all the rest volumetric units in the project. right? (in my case cms)
note that:
the last parts (pipes) of the drainage network is always filled with water and i figured, there is a chance that the water does not 'flow' as fast when the pipes are filled. but i checked the time series plot of the 'total inflow' to the pond and it seems that (after the initial transients) there is an steady state inflow to the pond of 1.35cms....
so i reduced the critical inflow value to 0.5. and removed the DEPTH condition of the specific pump (i commented out RULE PS2_P2.2.1 using ';' as a comment separator)... now the pump does not switch ON anymore...
any clues?
thank you in advance for your help
nass
Linear Mode
