On 12/22/2020 8:50 PM, Jon Elson wrote:
Using too low a resistance won't harm the MOTOR, it will blow the power brick in the VFD.
Right. The newer drives chop current off the DC bus to the braking resistor to lower the DC bus voltage as the motor slows.
I'd find out what they recommend. You can oftentimes buy braking resistors on Ebay. I sold some bigger ones a while back that looked like room heaters.
But bigger wirewound resistors should work as well. You might not need one at all unless you want to slow the motor quickly. Usually if you slow the motor too fast and the DC bus goes into overvoltage, the drive just shuts down and the motor coasts. Nothing bad occurs. So you can try it without a braking resistor and if you start tripping the drive with DC bus overvoltage alarms, then install a braking resistor.
Dave _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
