On 03/06/2015 07:19 PM, Gregg Eshelman wrote: > On 3/6/2015 6:54 AM, Todd Zuercher wrote: >> You might be able to get away with just adding a debounce to the limit >> inputs. That worked for me on a machine that was giving me false trips on >> the X limit. I suspected mine was a dodgy cable at the time, but it might >> have been cross talk since it hasn't given any problems since adding the >> debounce. > VFDs are supposed to be directly connected to the 3 phase motors, but I > wonder if it's possible to add capacitors or something to smooth out the > output. > > No, you don't want capacitors directly on the output of the VFD. The sharp, 400V edges will cause high currents, and either pop the capacitors or the output transistors. What you want is a line filter module at the power input, and if that isn't good enough, then a set of 3 inductors on the output to the motor. I found a line filter on the line input cleared up some intermittent problems on my mill. I used a commercial line filter module.
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