RTC Logic Example

Logic operators can be used to combine the results from two ranges to give a TRUE or FALSE result.

The following example shows the RTC for controlling the status of a pump depending on the depth in the controlling node and the flow in a downstream conduit.

 

Under this example, the pump will be switched ON when the level at node K reaches 20mAD, providing the flow in conduit K.2 does not exceed 0.5 m3/s. At other times, the pump will be switched OFF by default.

The RTC is defined by adding components to a pump regulator in the RTC Window Editor.

 

Component	Parameters	Effect
RANGE 1	Range type: Z - height above datum Location node: K Minimum: 20 Maximum:	TRUE if water level at node K is greater than or equal to 20 mAD
RANGE 2	Range type: Q - flow Location link: K.2 Minimum: Maximum: 0.5	TRUE if flow in conduit K.2 is less than 0.5 m3/s
LOGIC 1	Operator: AND Condition 1: RANGE 1 Condition 2: RANGE 2	TRUE if both RANGE 1 and RANGE 2 are TRUE
RULE 1	Condition: _default_ Rule type: OFF	Default status of pump is OFF
RULE 2	Condition: LOGIC 1 Rule type: ON	Switch on pump if LOGIC 1 is TRUE

 

1. Range 1: Defines node K as a control point with a minimum value of 20 mAD

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2. Range 2: Defines Link K.2 as a control link with a maximum value of 0.5 m3/s

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3. Logic 1: If the level at node K is at or above 20 mAD and the flow in link K.2 is less than 0.5 m3/s, this logic statement is TRUE

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4. Rule 1: Unless subsequent rules are true, the pump will be set to the default status of OFF

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5. Rule 2: Switches the pump ON if the level at node K is at or above 20 mAD and the flow in link K.2 is less than 0.5 m3/s

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For a further example of an RTC  Scenario, see RTC Example.