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  1. everest

    Single Phase Variable Frequency Drive

    Hoffman Controles makes an electronic speed control for single phase motors 120-480vac that will take a 4-20mA control signal. Model #708-BVmA or 708-CVmA phone #(972)243-7425. These controllers will only work with shaded pole or permanent split capacitor motors, all others will burn up.
  2. everest

    Bearing Damage on VFD motor

    Thanks for the great responses. We are presently working on a project that has around 150 pumps on these drives ranging in Hp from 5 to 200. I became very alarmed when we began to have so many failures on other jobs in the last few months. These pumps have a very critical application...
  3. everest

    Bearing Damage on VFD motor

    We have had the bearings on three centifugal pump motors on three different jobs fail. The pumps have been in service ranging 1 year to three months. We had the bearigs on one motor analyzed, they said the races were fluted (I think thats the right word) due to electric discharge. I know this...
  4. everest

    Calculating noise level of a boiler blowdown

    Does anyone know of a method for calculating the noise level of a boiler blowdown. Boiler operates at 120 psig the blowdown piping is 8" approximatley 60' long venting 40,000 lb/hr to atmospheric pressure
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