How to determine motor speed on Centrifuge

How to determine motor speed on Centrifuge

Look at the VFD display for main motor.

Read the running Hz

From motor nameplate find the RPM corresponding to 60Hz installation 
Scale RPM over 60Hz and find your current RPM based on the  Running Hz

example:
3600rpm 60Hz = 60rpm/Hz = 1HZ=60rpm

Running Hz: 45Hz
=> 45Hz x 60rpm= 2700rpm

2 pole motor: 3600rpm
4 pole motor: 1850rpm
8 pole motor: 850rpm 
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