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- Jun 12, 2014
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A few things to note, I have used the KB drives, and use this particular one for the Z axis lift motor on my mill, I run VFD gear head motors for X and Z directions. To answer your original question, there is no provision for an external braking resistor on this model. It does have some adjustment for acceleration and deceleration time via the trim pots. These KB drives have pretty limited braking ability, and some of there other KB VFD systems I have used, the braking module cost almost as much as the VFD. I ended up replacing my KB VFD on the X drive, because of limitations in braking and no programming ability other than tweaking the pots. That being said, on a small 10x20 lathe that you want variable speed, it will work fine.
VFDs trip GFIs not because of overload (A GFI does not trip for an overload, only ground fault), they trip because of the EMF caused by the VFD is picked up in the neutral wiring from the VFD to the wall. This trips the GFI, most VFD manuals I have read state not to use a GFI. Common problem when people try to run VFDs off of there garage GFI outlets.
VFDs trip GFIs not because of overload (A GFI does not trip for an overload, only ground fault), they trip because of the EMF caused by the VFD is picked up in the neutral wiring from the VFD to the wall. This trips the GFI, most VFD manuals I have read state not to use a GFI. Common problem when people try to run VFDs off of there garage GFI outlets.