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IndustryArena Forum > CNC Electronics > Spindles / VFD > Bitsensor board PWM drop under 8,4V can’t reach maximum RPM

Thread: Bitsensor board PWM drop under 8,4V can’t reach maximum RPM

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  1. 06-09-2023, 07:28 PM #1
    diltech2
    diltech2 is offline
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    Question Bitsensor board PWM drop under 8,4V can’t reach maximum RPM

    Hi,

    I have a Bitsensor usb card connected to a Huanyang 2.2KW VFD. i am able to open and close my spindle correctly and also vary the speed in mach3.
    My problem is that I am unable to have the maximum power for my pin which cannot go to 24000. When I test my card without being connected to the VFD, the AVI pin gives 10V at most. if I connect the latter to the VFD, my output at maximum drops to 8.4 volts. my spindle does not turn at its maximum. there is a large drop when connecting to the VFD. I don't understand.
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  2. 06-09-2023, 10:38 PM #2
    CNCMAN172
    CNCMAN172 is offline Registered
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    Re: Bitsensor board PWM drop under 8,4V can’t reach maximum RPM

    What gage wire are you running between VFD and bitsensor card? If wire gage is too small this can happen
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  3. 06-10-2023, 02:09 AM #3
    diltech2
    diltech2 is offline
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    Re: Bitsensor board PWM drop under 8,4V can’t reach maximum RPM

    Hi,

    I think my gauge it’s ok. I have 18 awg. When i measure voltage without connecting to VFD, the voltage it’s correct.
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