On 12/26/2020 10:47 AM, Gene Heskett wrote:
Two additional questions. That 70 ohm 300 watt braking
resistor just walked up and rang my doorbell, so are you
using one? and if so what settings mods have you made in
the VFD?
Mine has several settings. There is a minimum frequency,
below which it goes to DC injection braking.
You don't want to use too much DC injection as it will cause
an abrupt stop of the motor. Quicker braking time will
cause more energy to go to the resistor, if you set it too
short, the DC link may go to overvoltage. You may have to
just experiment a bit to find out what decel times make
sense on your particular machine. If you rigid tap, you
need a braking resistor to reduce the overrun after you get
to desired depth.
Jon
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