Motor protection filters

This topic contains 6 replies, has 2 voices, and was last updated by  Anne Cross 4 months, 1 week ago.

  • Author
    Posts
  • #9747

    Anne Cross
    Participant

    These look just like line reactors, are they the same?


  • #9748
    John C
    John C
    Galco Representative

    Hello Anne, not exactly they are simular but the motor filter has an RC network attached to it to help trap those high frequency spikes that can be detrimental to your motor.


  • #9749

    Anne Cross
    Participant

    Ok thanks John but what factors do you need to consider to select 1 of these then?


  • #9750
    John C
    John C
    Galco Representative

    Great question Anne, when sizing a motor filter first consider the length of motor lead between the motor and drive. If less than 50′ you may not need 1, if more than 50′ you might get away without 1 but should be verified by a qualified technician to see how high the spikes are at the motor junction box. Also makes a significant difference if using an “Inverter Duty” motor or not. Typically Inverter duty will have insulation class F rating good for higher temps and 2000volt peak tolerance. Standard insulation class B motors may only have a 1200volt peak rating. Then there is the Frequency ratings, 60Hz max speed and a Carrier Frequency setting in the drive of 2KHz to 4KHz are what these devices are rated for, ok?


  • #9751

    Anne Cross
    Participant

    So base speed and noisy motors are all we can expect with a filter on it?


  • #9752
    John C
    John C
    Galco Representative

    Well if you need a special application accommodated and the motor and drive can’t be located less than 50′ apart, we can always consult the mfg for additional solutions. Besides sometimes you can get over 50′ out without a filter, especially if using an Inverter Duty motor, ok?


  • #9753

    Anne Cross
    Participant

    Ok thank you John


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