For more information, Your Partners in Pumping are available at 26 or to the International Council of Witchcraft Voodoo Master Spell Casters WhatsApp ☎ +27765274256 JMI Pump Systems professionals are able to assist you with finding the best duplex system for your application. The standard covers we provide will typically maintain separate access for pumps and floats for improved serviceability. JMI Pump Systems also offers an assortment of steel, stainless steel, and custom PVC cover options for pump basins as well as packaged systems with controls. PLC controls can be enhanced with an HMI (Human Machine Interface) Touch Display to directly interact with sensors, valves, pumps, motors, and more. The controls can be purpose-built, a PLC or programable I/O. It is highly recommended to have separate circuits for both pumps and the alarm, totaling three circuits. If one breaker is being used for the incoming pump power for both pumps, it needs to be sized for the possibility of both pumps starting and running at the same time. The alarm must be installed on a separate electrical circuit, separate from the circuits feeding the pumps. The next time the lead float is triggered, the other pumps will assume the “lead” role. At this time, the pump(s) will continue to run until the stop float is lowered to the stop position. If the liquid reaches this float, the lag pump will turn on and the alarm will sound, warning there is a system problem. In a three float system, the third float is the lag/alarm float. The lead float is the float that runs whichever pump happens to be called on for at that cycle. The stop float is the float that turns off whichever pump was called on to run. There are some systems that do use four floats, separating the lag and the alarm function. The alternating control panel is typically operated by three control float switches: stop float, lead float, and lag/alarm float. If one pump needs to be serviced, the system remains automatic by utilizing the lag pump. In wastewater and sewer applications, the peak flow needs to be able to be pumped by the lift station even if it never occurs.Īn alternator controlling the duplex system allows the pumps to cycle between starts, resulting in even wear on the pumps. The duplex design is often referred to as lead/lag systems because the standby pump (lag) is activated as demand exceeds the capacity of the lead pump or if the lead pump were simply to fail.įor example, a typical design requirement for pumping wastewater is that a single pump will discharge more than the peak inflow. The duplex pump system is one of the most common configurations in a pump station design, providing efficiency and redundancy. Duplex systems are also used in large volume stormwater pump stations, as well as when redundancy is desired. The dosing timer will allow power to the pumps for a set interval and disconnect power from the pumps for a prescribed amount of time.In Wisconsin, duplex pump systems are required by code in commercial buildings when there are three or more water closets or more than 20DFU’s draining into a sewage basin. That type of timer allows the operator to control how long the pumps are activated and how long they are deactivated. A float switch is most often used to activate and deactivate the pump.ĭosing timers are the most common type of timer found on duplex control panels. This is because the pump is activated whenever it is needed. This allows the lift station to continue to accommodate high flow rates and continue to operate after a pump malfunctions.Ĭontrol panels that do not use a timer for their effluent pump are called “on demand” panels. Additionally, these control panels can activate the second pump if the flow rate into the system is too fast or if the first pump has failed. These panels allow the station to alternate between pumps, so that one pump does not wear significantly sooner than the other. Lift stations are the most common location for these control panels. Various models will have different approaches for the second function, but all control panels will serve those two functions. Their second function is to organize and manage the systems they power. To do that safely, these units are weather resistant to protect their electrical circuits from the elements. Their first function is to provide a location to joint electrical equipment to a power source. This means that the control panel will alternate which pump will be activated first for each cycle.Ĭontrol panels have two main functions. These panels are often configured such that each pump will take turns as the primary pump. Duplex panels are utilized to control two pumps simultaneously.
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