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Thread: Mitsibushi Inverter model FR-D720S-070 Help

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    Mitsibushi Inverter model FR-D720S-070 Help

    I purchased a new Mitsibushi Inverter model FR-D720S-070. Yesterday
    I'm trying to drive my (Chinese)spindle motor which is rated as follows
    220-250v
    8000-24000 rpm
    400Hz
    8amp

    I'm having great trouble getting it to run correctly. The manual is 300 pages and confusing.
    I want to run the inverter in easy mode without any external control or input for the moment.
    Can you help me with an easy setup please. I dont want to cook my spindle motor.
    George

    **************************
    As always, I panick when I see a 300 page manua. But I sat down and had a good read.

    I have managed to get the inverter running in 'stand alone mode' and I'm able to control the speed of the spindle with the wee thumbwheel.
    I was a bit worried of cooking the spindle at first because it was running hot, very hot. But once I found that I had to set the base frequency to 400HZ it was fine.


    So far I have set the following parameters.

    0=4
    1=50 Min frequency
    2=400 Max frequency
    3=400 Base frequency
    4=400 Multi speed setting high
    5=200 Multi speed setting mid
    6=100 multi speed setting low
    18=400 Hi speed max frequency
    79=1 operation mode fixed to 'PU'

    I havent messed with any other parameters for now as the spindle seems to be running fine.

    My only issue is that my cheapy Chines inverter had a 5 digit display and did show the spindle speed nicely. The display on the new inverter is only 4 digit and dispays frequency only.

    Given that the 400hz spindle is rated at 220v 3Phase 400Hz 24,000rpm am I correct in assuming that with 200HZ set on the inverter drive that the spindle is running at half spped i.e. 12000rpm

    And of course if I use the 0-10v input I'm assuning that 5volt would also give 12,000 rpm.
    Last edited by Georgie; 04-22-2012 at 12:16 PM. Reason: Problem Solved and posted to another area.


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