Recent post about the guy moving to Japan has me wondering if my 1100mx is running at 10,000rpm.
I’m in the uk on 240v 50hz. The readout shows 10,000rpm but is it true? Does the VFC compensate for this or is the display lying to me? And if I am only getting 8,000-9,000 rpm is there a way to adjust the VFC to compensate or show the correct rpm or is it accurate?
I don’t have any way to measure the spindle rpm.
The VFD in the machine takes your incoming AC power, converts it to DC, then uses that DC to create variable-frequency 3-phase AC power for the machine. The VFD might need to be programmed with what the incoming frequency is if it uses that for reference (some do, some don’t), but otherwise it’s not relevant.
FWIW, a handheld tachometer can be purchased from a variety of online sources for cheap if you’re looking for a way to verify your actual spindle speeds. I think I paid $30 for mine when I first got my machine and was worried about such things.
I have an ever growing distrust of all things cheap and Amazon. I will try one. I guess if it matches machine speed readout at several steps along the range I should be able to trust it. Maybe….
When in doubt read the manual
Nidec Unidrive M200
The controller to VFD control line is a simple 0 to 10Vdc control line where 0 VDC represents 0 RPM and 10VDC represents the highest RPM configured in the VFD parameters.
I battled a similar issue where the spindle only operated between 6k RPM to 24K RPM, when I expected 0 to 24K RPM operation.
I replaced my spindle with a higher quality, more expensive, PWN CNC spindle and the spindle operated over the full range.
I verified RPM’s using a handheld tachometer.