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Flow Equalization Controls

Control Strategies PIDs
EQ Basin Effluent Pump Influent Pump Station PID
EQ Basin PID
 
Influent Pumps 5 & 6 (Storm Pumps)
Local Manual Control
These constant speed pumps can be controlled with the Hand/Off/Auto selector switch at the local panel. With the switch in the Hand position, the pump will start.  The local controls are limited by hardwired interlocks for personnel safety and equipment protection.
SCADA Manual Control
Put the local Hand/Off/Auto selector switch in the Auto position. The pumps can be started by moving the Manual/Auto selector switch on SCADA to the manual position. The pump selected will now run until turned off manually.
SCADA Auto Control
Put the local Hand/Off/Auto selector switch in the Auto position. Choose Auto on the SCADA screen for pump control and select one of the two storm pumps as Lead. Influent pump 5 or 6 will start when influent flows exceed approximately 11 MGD.  Pumps 5 & 6 (storm pumps) operate in a duty/standby operation.  Only the one selected in SCADA will start when called upon.  The other storm pump will start if the running pump fails.
Fault Conditions
Pump fail.
 
Flow Equalization Basin Effluent Pump
Local Manual Control
When the Pump Local/Off/Remote switch is in the Local position, the pump will run at a constant rate of 700 gpm. The pump will shut off automatically on low-level, or when the switch is moved to the Off position.
SCADA Manual Control
When the Pump Local/Off/Remote switch is in the Remote position, the pump can be started from SCADA. The pump will shut off automatically on low-level, or when the SCADA switch is moved to the Off position.
SCADA Auto Control
When the Pump Local/Off/Remote switch is in the Remote position, the pump can be automatically controlled from SCADA.   Two conditions need to be met before the EQ transfer pump can turn on. The level in the EQ basin must be above an operator adjustable point, currently 1.8 feet. The flow into the plant must be lower than a second operator-adjustable level, now 2.5 MGD. When both of these conditions occur, the pump will start.  If flows increase to 3.5 MGD, then the transfer pump turns off. The transfer pump will continue to run until the EQ basin drops to 0.5 feet, at which point the pump will automatically shut off.
Fault Conditions
Pump overload, high temperature and pump seal fail.

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Last Updated: 9/16/2013 11:44:10 AM
Version 4.0.1