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Influent Pumping Station Controls

Control Strategies PIDs
Influent Pump Station PID
Influent Pumps 1 - 4
Local Manual Control
The variable speed pumps and the 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 speed of VFD driven pumps can be varied by the local speed potentiometer when operating in the Hand position. 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 constant speed pumps can be started by moving the Manual/Auto selector switch on SCADA to the manual position. The constant speed pump selected will now run until turned off manually.
The variable speed pumps can be started by moving the Manual/Auto selector switch on SCADA to the manual position and entering a percentage of full scale speed (%). The variable speed pump will now run at the speed chosen on the SCADA screen.
SCADA Auto Control
Raw sewage pumps 1 and 2 are controlled by variable frequency drive units, while raw sewage pumps 3 - 6 are constant speed pumps.  When the local switch and the SCADA switch are in Auto, the following program in the PLC controls the operation of the influent pumps:
Pumps 1 and 2 operate in a duty/standby configuration.  Under dry weather flows, either pump 1 or pump 2 operates and is controlled by a VFD to maintain an operator-adjustable wet well set point. If the VFD-controlled pump fails, then the standby VFD pump starts.  If pump 1 or 2 are unable to maintain the wet well setpoint, then pump 3 or 4 starts.  Raw sewage pumps 3 and 4 operate in a lead/lag configuration. An operator selects in SCADA which pump operates in lead.  If pump 3 is selected as lead, then it starts if the VFD-controlled pump is unable to maintain the wet well set point.  If the wet well continues to increase after pump 3 is running, then pump 4 starts as a lag constant speed pump.  If the lead VFD-controlled pump fails during this operation, then the standby VFD pumps starts.  If one VFD and both lag pumps are unable to maintain wet well level, then the standby VFD pump will start.  In this high-flow scenario, pumps 1 - 4 are running and pump to the Headworks.  If these four pumps are unable to maintain wet well level, then pump 5 or 6 starts and sends flow to the Equalization Basin.  Pumps 5 and 6 operate in a duty/standby configuration.  If pump 5 is selected as lead and it fails during operation, pump 6 starts.
Fault Conditions
Pump fail.
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.

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Last Updated: 9/16/2013 8:57:14 AM
Version 4.0.1