Oak with Delta C2000

[cncsnw]

One possibility is that the VFD has a problem with the forward and reverse commands switching, with little or no delay between the two.

Most VFDs will not run if both the forward and reverse inputs are closed at the same time. That is not really happening in your case, but maybe the VFD thinks it is happening, and then refuses to run again until both inputs have been opened.

You could experiment by running a couple of test G code programs.

One, running reversals without delay:

Code: Select all

M3 S500
G4 P5
M4
G4 P5
M3
G4 P5
M4
G4 P5
M3
; ... and repeat a dozen or so more times

the other, running the same reversals, with a fraction of a second pause between commands to run in different directions:

Code: Select all

M3 S500
G4 P5
M5
G4 P0.1
M4
G4 P5
M5
G4 P0.1
M3
G4 P5
M5
G4 P0.1
M4
G4 P5
M5
G4 P0.1
M3
; ... and repeat a dozen or so more times

If the first version exhibits the failure-to-start problem, and the second version does not, then it is probably a forward/reverse timing issue. If Delta does not have any solution available, you could probably work around it with macro or PLC programming on the Centroid side.