Graco 311593N important safety instructions Overview, Flo Electric Circulation Pump

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Overview

Overview

An electric motor (B) provides input to a 75:1 gear reducer (GR), which drives two fluid pumps (FP). See FIG. 1. The stroke positions of the two pumps are offset to achieve consistent flow from the pump assembly. See FIG. 2.

B

The optional sensor circuit includes a top dead center (TDC) sensor which assists software in measuring motor speed, and a pressure transducer (PT) with circuit board, which measures fluid pressure at the pump out- let. The Graco VFD software mimics the effect of a cam- shaft, constantly adjusting motor speed to keep steady fluid flow and achieve minimal pressure variation. The output shaft of the gearbox and the connecting rods experience the effect of the imaginary camshaft by speeding up when the pressure drops (pump lower is at a changeover) and slowing down when pressure increases (both lowers are pumping).

TDC (behind cover)

FP

GR

PT

FP

The VFD can be controlled by a local control box mounted in the hazardous area, via communication pro- tocol (such as modbus), or directly from the keypad.

FIG. 3 shows a layout of a typical North American sys- tem. The pump (A) may be controlled by a local control box (C) mounted in the hazardous area, a variable fre- quency drive (D) mounted in the non-hazardous area, or remotely from a computer (Y). See manual 311592 for pump and accessory installation information.

ti8317c

FIG. 1. E-Flo Electric Circulation Pump

ti8321a

FIG. 2. Cutaway Showing Offset Stroke Positions

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311593N

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Contents Flo4-Ball Piston Pumps Contents Related ManualsModels Flo 4-Ball Piston PumpsMaximum Working Pressure and Pump Operational Limits SourceModels Approvals Component ApprovalsMotor Is Sensor CircuitFire and Explosion Hazard Electric Shock Hazard Overview Flo Electric Circulation PumpEntrance HazardousArea Overview Ground the System Controls and Indicators Variable Frequency Drive VFDLocal Control Box 120373 UL/CSA Control BoxSetup Flush before using equipmentFill gear reducer reservoir with oil Fill TSL ReservoirsPressure Relief Procedure OperationPriming StartupMotor Speed and Flow Chart Equations for each lineMaintenance Preventive Maintenance ScheduleClean the Slider Cylinder Collectors Check Gear Reducer Oil LevelChanging the TSL Follow Pressure Relief Procedure,Flushing Technical Data Flo 2000/3000/4000 15 ft-lb 20.3 NmFluid Flow in gpm lpm Graco Standard Warranty Graco Information