Questions regarding spindle drive parameters.

[daniel]

I just put a 3hp colombo spindle on my shopbt. it is driven by a Commander SE VFD.

I have the VFD parameter List, and i have the info Tag on the spindle.

One of my questions is about what others have set their parameters to.

(1) Minimum speed in Hz, mines set a 75 Hz
(2) Max speed in Hz, mines set at 400 Hz

(3) What is the power factor? I don't see that on the tag. mines set at .91

(4)My VFD has a parameter for rated speed(rpm), however the parameter does not hold a big enough value. The manual for the VFD says if this case occurs, use 0 for the parameter.

How does one dertermine the rpm of the spindle?

Can the VFD run the spindle to fast and damage it?

[Brady Watson]

Don't know about that specific VFD in regards to display options. I believe the lower RPM limit on the newer spindles are programmed with 5000 as the lowest RPM. Your Colombo is a 400Hz spindle and you have a matching 400Hz VFD. This is good. There is no danger of over revving it. An HSD, which is a 300Hz spindle, could over rev if put on a 400Hz VFD without max RPM limit set.

Each Hz is 60 RPM. 300Hz = 18,000 RPM & 400Hz = 24,000 RPM

Hope that helps...

-B

[daniel]

Thanks Brady! I'm gonna go shave down my table then!