1. #1
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    I have a 4kw air compressor. 220v/380v rated

    I have wired the motor in delta. For 220v 3 phase.

    The Badge on the motor states RPM 2880 at 50 hz

    I have a 4kw VFD. Set at 50hz. This is giving me 1440 RPM. The single phase power input is 240V (France used to be 220v but is now 240v) . The VFD states it is drawing 5.2A

    Can I safely increase the HZ to bring up the Motor RPM ?
    Last edited by dudz; 24-12-2015 at 07:46 PM.
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  2. #2
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    Quote Originally Posted by dudz View Post
    I have a 4kw air compressor. 220v/380v rated

    I have wired the motor in delta. For 220v 3 phase.

    The Badge on the motor states RPM 2880 at 50 hz

    I have a 4kw VFD. Set at 50hz. This is giving me 1440 RPM. The single phase power input is 240V (France used to be 220v but is now 240v) . The VFD states it is drawing 5.2A

    Can I safely increase the HZ to bring up the Motor RPM ?

    Done....

    Found a setting on the VFD = PD144 Motor RPM Setting
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  3. #3
    Sounds like a "pole changing motor" which often have complicated wiring connections, 2 pole delta may not be possible, need some of the boffins of the forum to comment.

    Std motors generally dont like 100Hz and would probably adsorb more than 4Kw anyway.

  4. #4
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    Quote Originally Posted by johnsattuk View Post
    Sounds like a "pole changing motor" which often have complicated wiring connections, 2 pole delta may not be possible, need some of the boffins of the forum to comment.

    Std motors generally dont like 100Hz and would probably adsorb more than 4Kw anyway.
    Already sorted but thanks for your input ! . Read above
    Last edited by dudz; 24-12-2015 at 08:43 PM.
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

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