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  • Users: pbcd
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  1. pbcd

    Specifying a 370V capacitor for 460V use

    Why does some motor manufacturers specify (on their nameplate data) using a 370 volt capacitor on their 460 volt single phase motors?
  2. pbcd

    Puzzling electrical readings taken at VFD bypass contactors

    I have a question concerning an electrical test reading taken at the VFD bypass contactors. This VFD provides power to a 15 HP motor for an air handler unit. To check resistance across my contacts on my contactors I take voltage readings under load for each phase (from L1 to T1, L2 to T2 and...
  3. pbcd

    Burned out new 340 hp motor

    Installed a newly rewound 340hp motor on our air cond. chiller unit about a month ago. Ran chiller for about two weeks. Encounter no problems. Today, I switched on the chiller and after about 4 min. of running, the motor burnt out. Question: The chiller is designed with a solid state...
  4. pbcd

    Soft starter problem

    We have an Air Conditioning unit with a Benshaw soft starter. Last week when I turned on the breaker (not the start control) the SCR bypass had a huge arc, which melted the bypass contacts. I had the manufacturer rep. come down to do the troubleshooting and repairs. He megged the motor, ohmed...

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