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  1. bottler

    Restrictive earth faults

    Hi I am told my supply from a transformer is tripping on a restrictive earth fault detector , could someone please help me out and explain what a Restrictive earth fault is and how it could occur any info is greatly appreciated bottler
  2. bottler

    RFI vs Harmonics using VSD's

    Hi Can anyone explain the difference between RFI and Harmonics , with relation to 3 phase VSD's. also how are both generated? thanks bottler
  3. bottler

    2 speed ATEX motor

    Does anyone know of a good 2 speed AC Motor that is ATEX approved?
  4. bottler

    AC Drive vs DC Drive

    Thanks guys for the fast response. I have a rotary valve ,with an ac drive and turn down ratio of 8.5:1,I cant get the control I want between the vsd , rotary valve , turn down ration to control the feed of product I need , I can either reach the high end of my outfeed rangeaccurately and not...
  5. bottler

    AC Drive vs DC Drive

    I have alot of VSD's (Inverter's)controlling all my AC motors,I would like to keep all the same and have found that I may need to use a DC Motor in one application, Is it possible to use a VSD on a DC motor? or is a DC servo pack the equivalent of an AC motors VSD? any info is greatly appreciated.

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