phuz
Member
I have a customer who has a centrifuge application. The plant engineer did all the calculations on the centrifuge to arrive at a WK^2 of 6458 ft-lbs^2.
Using the simple formula provided by Eaton, and a starting speed of 650RPM and a final speed of 135RPM over a period of 90 seconds, I come up with a torque value of about 120 ft-lbs. The PowerFlex 755 says that 100% of the motor torque can be used for braking, which in this case is 233 ft-lbs. This tells me that the drive, itself, is more than capable to slow the centrifuge within the time requirement without needing a braking resistor. Does this seem accurate?
Using the simple formula provided by Eaton, and a starting speed of 650RPM and a final speed of 135RPM over a period of 90 seconds, I come up with a torque value of about 120 ft-lbs. The PowerFlex 755 says that 100% of the motor torque can be used for braking, which in this case is 233 ft-lbs. This tells me that the drive, itself, is more than capable to slow the centrifuge within the time requirement without needing a braking resistor. Does this seem accurate?