Retrofitting a motor mounted VFD
If the pump and motor are not in a hazardous area and the saving of life cycle costs and/or other hydraulic benefits supports the installation of a VFD, in some cases the use of a motor-mounted frequency converter may be the cheapest and easiest way to equip an already installed pump with this technology .
For motor sizes from 1.1 up to 22 kW (1.5-30 hp) motor-mounted VFDs are available which can be mounted on standard three phase AC-Motors without any machining on the motor casing.
They are cooled by the motor fan and are enclosed to IP54/ NEMA 12 and directly wired to the motor terminal box. An example is shown in Figure 10.3.
Related posts:
Case studies:Variable speed drives on heating, ventilating, air conditioning {HVAC) system pumps.
System and process requirements:Introduction to variable speed concept
Valves and Sensors:Air flow measurement
System selection considerations:Material compatibility and Design curves.
High pressure:Single blow tank control
Multiple use systems:Multiple material handling and Air supply control.
Review of pneumatic conveying systems:Closed systems
Material property influences:Dicalcium phosphate
HYDRAULIC PUMPS:Radial Piston Pumps
FORCES IN LIQUIDS:LIQUIDS AT REST (HYDROSTATICS)
Control components in a hydraulic system:Meter-out operation
Hydraulic pumps:Pump selection
Air treatment:Stages of air treatment,Filters,Air dryers and Lubricators.
Fluid flow.
INTRODUCTION AND OVERVIE:THERMODYNAMICS