Duplex Pump Station Control Panels

DUPLEX SEWAGE AND EFFLUENT PUMP CONTROLS

Duplex Control Panels are designed to control a pump stations with two submersible sewage or effluent pumps. 

The most common application for a duplex control panel is a system that needs a backup pump in place in case the original pump fails. Our Duplex panels will alternate cycles between the two pumps, making sure both are in working order throughout the lives of the pumps. If one of the pumps fails, the panel will give the high water alarm, and automatically kick on the other pump. This type of set up ensures that you will always have at least one pump in working order.

OPERATION OF A DUPLEX CONTROL PANEL

A standard duplex control panel can operate with 3 or 4 float switches. The standard 3 float setup has PUMP OFF, PUMP ON, and HIGH LEVEL floats. A 4 float setup would have a PUMP OFF, PUMP 1 ON (LEAD ON), PUMP 2 ON (LAG ON), and HIGH LEVEL floats.

The control panel has an alternating relay that switches between PUMP 1 and PUMP 2 after every cycle during automatic operation. This means that once the liquid level reachs the PUMP ON float that PUMP 1 will run until the liquid level reachs the PUMP OFF float. At this time the alternating relay will switch to PUMP 2 and it will follow this same cycle and the alternating relay will switch back to PUMP 1 and so on.

If you are using a 4 float setup, and the water level reaches the PUMP 2 ON (LAG ON) float switch, then the alternate pump not set to normally come on will be activated. The only reason the water level should ever reach the PUMP 2 ON (LAG ON) switch is because PUMP 1 has failed or cannot keep up with the incoming flow.

If the liquid level reaches the HIGH LEVEL float, the alarm light and buzzer on the control panel will be activated.