Today I received the revised Sangmutan VFD for my NM145. The good news is there is plenty of torque at Low RPM now. The bad news... the installation instructions leave much to be desired and the spindle won't spin CCW and you may have to move the mounting studs for the VFD.
First, if you get the VFD board and follow the included instructions it may not work. Part of the instructions say to remove the orange forward / reverse wire from the NC output of PIN 16 on the break out board and put it in the ground terminal of the power input section. (This makes the spindle ONLY spin forward -- no possible way to reverse) Next a pair of wires are connected to the K1 & K2 pins on the VFD after removing the jumper already there. These are the connected to PIN 16 and Pin 16 NO on the breakout board. This becomes a spindle enable output instead of spindle direction.
However the instructions say nothing about removing a pair of jumper wires already on PIN 16 to ground. If left in place the K1/K2 signal will be shorted to ground. (This might kill the VFD -- I didn't want to test it on mine.) These wires connect PIN 1 and PIN 16 of the break out board to ground. I just moved one wire to PIN 1 and left out the jumper to PIN 16.
The AC power to the VFD attaches to a different place then before. It does NOT attach on the terminal block with the UVW wires! The incoming power ground however does get attached by the UVW terminal block... I had to slit the insulation a bit on the cable to make the wire stretch far enough.
Problems: If your version of Mach3 is configured as mine was you will be able to command the spindle to spin forward but when told to reverse it will instead stop. It gets better, when commanded to stop the spindle will run forward. It will also run forward when you hit E-stop. Pressing the RESET button on Mach3 will sometimes also cause the spindle to run. The logic of the PIN 16 relay was set up to run the spindle direction originally now we want it to be a spindle enable that is safe when mach3 quits AND E-stop is pressed.
Editing the Mach3 configuration for Ports / Pins, Outputs so that PIN 16 is NOT active low fixes the problem.
I have tried a couple of alternatives to get spindle reverse back but without any technical information about the new Sangmutan VFD I have not found a perfect solution as of yet.
Charlie.