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:
Air flow rate evaluation:The influence of pressure and System influences.
Low pressure and vacuum:Hopper off-loading and Trickle valves
THE COMPRESSOR:MOBILE COMPRESSORS
Health and safety:System components,Blowers ,compressors and Oil free air.
Moisture and condensation:Humidity and Specific humidity
Troubleshooting and material flow problems:With change of distance.
Low pressure and vacuum:Screw feeders and The simple screw feeder.
Erosive wear:Influence of variables and Theories proposed.
Material related,Angel hairs and Coating of pipelines.
Low pressure and vacuum:Rotary valves and Drop-through valve
Control components in a hydraulic system:Flow control valves.
Process control pneumatics.
BASICCONCEPTS OF THE RMODYNAMICS:PROPERTIES OF A SYSTEM
PROPERTIES OF PURE SUBSTANCES:PHASE-CHANGE PROCESSES OF PURE SUBSTANCES
GAS MIXTURES AND PSYCHROMETRICS:DRY AND ATMOSPHERIC AIR