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    edgedsamurai's Avatar
    edgedsamurai Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 9, 2008, 03:01 PM
    How to prevent VFD interfrence
    Hi
    I have a VFD secondary chilled water pumps connected to the BMS, my problem is that once the VFD's are running the communication between the DDC panels are lost. Could anyone help me sort out this problem? I have done the proper earthing but the problem still exist. The VFD's are inside the MCC.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Mar 9, 2008, 05:50 PM
    WHat's the HP of the VFD?
    What's the proximity of the VFD to the DDC?
    Have you looked at possibe dips in the power to the DDC when the VFD starts?

    Possible routes are:
    RF
    EMI
    Power line pollution *
    Power line sags
    Ground loops

    Might try a filter at the VFD. What is voltage/current requirements for the VFD?

    * is probably likey
    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #3

    Mar 10, 2008, 04:24 AM
    VFD is a big contributor of harmonics that causes CB tripping, relays or PLC disturbance. Install a passive harmonic filter it will improve your hamonic level as well as impromving your power factor.
    Jithendran's Avatar
    Jithendran Posts: 13, Reputation: 1
    New Member
    		  
    #4

    Apr 2, 2008, 11:07 PM
    Hi..
    In that case do check the profibus or field bus card .The problem could be from card .
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