How to apply logical rules to a pump

Steps

1. Open the pump unit to which you are applying the rule(s) and navigate to the Control Data tab.

2. Use the drop-down to change the Control Method to LOGICAL. In the table provided, set the Mode to AUTO to use automatic mode from the start (time 0). When in automatic mode the unit will be driven by the rules you define. Also set the Pump Mode in this row to specify whether the pump should be on, off, or stopped at the start (time 0).

3. Navigate to the Rules sub-tab to add your logical rules. Click New Rule and the Rule editor will open in a new window. The rule must be of the form:

   IF (xxx)

   THEN PUMP = ON or THEN PUMP = OFF or THEN PUMP = STOPPED

   END

   Where xxx is a logical statement that can be evaluated as true or false. An example is provided below.

4. Repeat step 3 as required. Following 1 or more of the IF rules, an ELSE condition can be optionally provided to cover all other eventualities:

   ELSE PUMP = ON or ELSE PUMP = OFF or ELSE PUMP = STOPPED

   END

   An ELSE rule must be located as the final rule in the list. 

   Example usage: controlling the operation of a pump according to the water level at the two gauge points A1 and A2.

   • Rule1 turns the pump off (so it acts as a simple junction) when the water level is sufficiently low at both gauge points
   • Rule2 turns the pump on when the water level at A1 is greater than 10.0m and the water level at A2 is 12.2m or lower
   • Rule3 sets the pump to stop (so no water can flow through) in other situations (i.e. when the water level is sufficiently high at both gauge points)

   RULE1

   IF(LEVEL(A1).LE.10.0.AND.LEVEL(A2).LE.12.2)

   THEN PUMP=OFF

   END

   RULE2

   IF(LEVEL(A1).GT.10.0.AND.LEVEL(A2).LE.12.2)

   THEN PUMP=ON

   END

   RULE3

   ELSE PUMP=STOPPED

   END

5. Click OK to save and close the unit. Don't forget to also Save these changes to the network.