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P&ID: 12 _ <br /> CS: #11 <br /> LOCATION: Sewage Pump Station <br /> TITLE: MacArthur Sewage Pumps <br /> DESCRIPTION: <br /> This strategy shall determine the quantity of Sewage pumps required in response <br /> to the Wetwell Level (1-51). The lead pump is enabled and disabled (S1 1A) by <br /> first stage start/stop level setpoints. The lag pump will be enabled and disabled <br /> (S11 B) by second stage start/stop level setpoints. The 2nd lag pump will be <br /> enabled and disabled (S30B) by third stage start/stop level setpoints. Only three <br /> pumps shall be permitted to operate. <br /> INPUTS & OUTPUTS: <br /> LOGICAL INPUTS: <br /> N1 - Pump P1 Run/Off _ <br /> N2 - Pump P2 Run/Off <br /> N3 - Pump P3 Run/Off <br /> N4 - Pump P4 Run/Off <br /> LOGICAL OUTPUTS: <br /> S1 1A - 1st Pump in Sequence Enable/Disable _ <br /> S11 B - 2nd Pump in Sequence Enable/Disable <br /> S11 C - 3rd Pump in Sequence Enable/Disable <br /> X1 U - Pump P1 Call/Null <br /> X2U - Pump P2 Call/Null — <br /> X3U - Pump P3 Call/Null <br /> X4U - Pump P4 Call/Null <br /> VARIABLE INPUTS: <br /> L51 - Wetwell Level Feet <br /> VARIABLE OUTPUTS: <br /> None <br /> SETPOINT REGISTERS: _ <br /> SP11A - Pump Sequence Code # <br /> SP11 S - 1 st Stage Start Level Feet <br /> SP11T - 1st Stage Stop Level Feet <br /> SP11 U - 2nd Stage Start Level Feet <br /> SP11 V - 2nd Stage Stop Level Feet <br /> SPI 1W - 3rd Stage Start Level Feet — <br /> SP11X - 3rd Stage Stop Level Feet <br /> SPT11 S - 1 st Stage Start Delay Seconds <br /> SPT11 T - 1 st Stage Stop Delay Seconds — <br /> SPT11 U - 2nd Stage Start Delay Seconds <br /> SPT11V - 2nd Stage Stop Delay Seconds <br /> 21 <br />