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:
Pumps:Pump suction performance (NPSH)
Particle degradation:Test rigs and data sources
Health and safety:System components,Blowers ,compressors and Oil free air.
First approximation design methods:Empirical relationships
Review of pneumatic conveying systems:System requirements and Multiple pick-up
ROUBLESHOOTING PNEUMA TIC CIRCUITS:GLOSSARY
MAINTENANCE OF HYDRAULIC SYSTEMS:ROOT CAUSE FAILURE ANALYSIS
HYDRAULIC PUMPS:Wobble Plate Inline Pumps and Bent Axis Pumps.
FORCES IN LIQUIDS:STREAMLINE AND TURBULENT FLOW.
Control components in a hydraulic system:Meter-out operation
LINES, FITTINGS, AND SEALS:Hose Connection Side of Hose Fittings.
Definition of terms: Mass and force ,Pressure ,Work, energy and power and Torque.
Safety, Fault-Finding and Maintenance:fault-finding
Fluid statics:Pressure at a point
SUMMARY OF BASICCONCEPTS OF THE RMODYNAMICS