Presion constante subdrive

SubDrive75 Frequently Asked Questions
How do I determine which pump to use? Why use a 3/4 hp pump on a 1.5 hp, 3-phase motor (SD75)? Whose pump can I use for SubDrive application? Can I put other pump ratings on SD75? What is the range of operating speeds for the SubDrive? Can I repair the SubDrive controller? What about lightning? Can I install a faucet at the wellhead? What is Power FactorCorrection? Will a leak cause the SubDrive to run the pump continuously? Can I expect energy savings, and if so, how much? How does the unit hold pressure (the dithering)? Life of pressure sensor? Will the orifice of the pressure sensor be clogged? Does the SubDrive use the same enclosure as the FE medium control box? What breaker size should I use? Can I put SubDrive outside or in direct sunlight?Can I use this as a generic Variable Speed Drive? Can a SubDrive be used with a non Franklin Electric Motor? What size cable? Can I use the SubDrive with generators? Can I use the SubDrive with a solar inverter? Does a SubDrive installation require a special motor? What is the highest ambient temperature that the SubDrive75 will withstand and still provide full power? Can I mount this in a dampenvironment? Why does pressure fall off when the all faucets are open? Does the SubDrive go to S.F. amps or to F.L.A.?

What happens if the pressure switch cable is cut? Can I use SubDrive in hot water applications (140 degrees)? Can I use a GFCI with the SubDrive? Can the motor run backward?

How do I determine which pump to use? In the SubDrive series, the pump can be different than the motorhp size. Model SubDrive75 SubDrive100 SubDrive150 SubDrive300 Pump Size ¾, 1 and 1.5 hp 1 and 2 hp 1.5 , 2 and 3 hp 3 and 5 hp Motor Size 1.5 hp 2 hp 3 hp 5 hp

Example: The SD75, used with a 3/4 hp pump on 1.5 hp motor, provides the performance similar to the 1.5 hp standard curve in the same pump series. In other words, you will be using a ¾ hp pump to get the performance of the 1.5 hp curvein the same series... use the 1.5 hp curve when choosing the proper ¾ hp pump to use. Refer to the installation manual for more information. Top

Why use a 3/4 hp pump on a 1 1/2 hp, 3-phase motor (SD75)? The SubDrive75 will spin the pump at a rate that will produce constant pressure without overloading the motor or exceeding a maximum speed of 80 Hz (@ 4,800 rpm). This means that the speed ofthe pump may exceed the conventional speed of 3,450 rpm. As speed increases, head increases by the square of speed (exponentially), so you get a lot of head performance with just a small increase in speed. Top

Whose pump can I use for SubDrive application? Any pump that is in the same pump series as the rated drive pump and is

appropriate for the desired head and flow performance. Top

CanI put other pump ratings on SD75? It is possible to use a 1 hp pump on a 1.5, 3-phase motor, but it is important to remember that you will still get the performance of the 1.5 hp curve in that series and the SW1 switch must be changed to represent the pump selected. Use of the 1 hp pump is recommended only in flow ranges where a 1 hp pump is available but a ¾ hp pump is not. Top

What is therange of operating speeds for the SubDrive75? The range of operation for a SubDrive75, 100, 150 and 300 is as listed: Minimum = 1,800, Maximum = 4,800 rpm The range of operation for a MonoDrive and MonoDriveXT is as listed: Minimum = 1,800, Maximum = 3,600 rpm Top

Can I repair the SubDrive controller? Currently, the only option for repair of a damaged SubDrive controller is replacement. However,replacement fans are available in the event of a fan becoming damaged. Top

What about lightning? The SubDrive is equipped with premium surge protection. It is designed to withstand a Voltage surge of 6,000 Volts for 28 microseconds. MOVs (Metal Oxide Varistors) are used to protect the SD75 input and output terminals from Voltages above 1,200 Volts. These are the same devices used in computer...