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  1. #1
    Join Date
    May 2012
    Posts
    23

    APC FM35M Computer room unit

    I have a APC (liebert type a/c),has 2 seperate direct drive / frequecy drive motors. One of the 2 drives is shot (GE Fuji drive).It has no local display on it and the main microprocessor has some access to its running parameters,my question is the drive controlled directly by the microprocessor via modbus or something proprietary.i'm trying to figure how the drive knows what parameters it needs to run at,perhaps its preconfigured from apc and has to be purchased thru apc in order for it to operate.Any help appreciated the books i read had limited info.
    Thanks

  2. #2
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,336
    All I know is...yes it communicates via modbus to main controller. I have only replaced one and I got it from our APC rep. I was told it wasn't programmed by APC, but it was programmed for APC.

  3. #3
    Join Date
    May 2012
    Posts
    23
    Thanks for that info

  4. #4
    Join Date
    Dec 2003
    Location
    Northern VA
    Posts
    622
    No Display = RS485 port on the drive. Windows 95 and later.
    "Iron sharpeneth iron..."

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