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  1. Phlipper

    Transformer Cooling Ratings Definition

    Good day, I came across some transformer cooling ratings that I did not recognize, and cannot find definitions for. Couldyou help me? 1. ONP 2. ONS I look forward to your replies.
  2. Phlipper

    Resistors on a 3-Phase Motor Fed From a VFD

    electrageek, This application is an e-stop scheme, thus the reason for the coarse method of braking. Phlipper
  3. Phlipper

    Power spikes

    ChillerGuy: Good Morning! What type off starting does this motor/compressor have? Across-the-line? Wye-Delta Start? Soft Start? We had experience where a customer had two air compressors, fed from the same 600/3/60 bus, but only one exhibited frequent failures. These were wye-delta start...
  4. Phlipper

    Frequency Swings on Gas Engine Generator

    peterb/dlwalsh/dpc: Thanks for your replies. I will include these on my list-to-check. I'll let you know how this all turns out. Phlipper
  5. Phlipper

    Resistors on a 3-Phase Motor Fed From a VFD

    Electricuwe, Thanks for your reply. As it turns out, this motor does have a permanent magnet rotor. How much of a difference could this make to the stopping of the motor/load (in relative terms only)?
  6. Phlipper

    Frequency Swings on Gas Engine Generator

    We have a situation where two gas engine generators, 800 kW, 600 VAC had been running in parallel when one of these units started exhibiting significant frequency swings to the point where operations have taken it off line. Each of these have Woodward 721 digital governor controllers with load...
  7. Phlipper

    Resistors on a 3-Phase Motor Fed From a VFD

    Our application involves a 3-phase AC servo-motor fed from a VFD. The Drive vendor recommends that a switch be installed on the output side of the VFD (between VFD and motor), which would isolate the motor from the drive AND connect the motor to a 3-phase connected resistor bank. I can see...

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