Hi,
If you are using Mach 3, then I have an identical system to yours hardware and software.
I have got Mach 3 controlling the VFD inverter. Just 4 wires from JP-3163B v.3.9 to the Nowforever.
I have also got the limit and home switches working.
So let's exchange experiences.
FYI
JP-3163B ver. 3.9 (from I own testing)
Pin 1: Spindle on/off Relay 1(active low)
Pin 2: X Axis Step (active low)
Pin 3: X Axis Dir (active low)
Pin 4: Y Axis Step (active low)
Pin 5: Y Axis Dir (active low)
Pin 6: Z Axis Step (active low)
Pin 7: Z Axis Dir (active low)
Pin 8: A Axis Step (active low)
Pin 9: A Axis Dir (active low)
Pin 10:Estop (active low)
Pin 11: X Axis Limit Switch (active high) = when NC switch(es) open
Pin 12: Y Axis Limit Switch (active high)
Pin 13: Z Axis Limit Switch (active high)
Pin 14: Buffer Chips “Enable” controlled by computer if Jumper 3 is set to 1-2 position
Pin 15: Probe (active low)
Pin 16: Is supposed to turn Relay 2 on/off but is currently not connected in board.
Pin 17: PWM 0-10V for VFD Spindle AN1 (if jumper 4 is in default 1-2 position) active low
Pin 18: Gnd
Pin 19: Gnd
Pin 20: Gnd
Pin 21: Gnd
Pin 22: Gnd
Pin 23: Gnd
Pin 24: Gnd
Pin 25: Gnd
Jumper 1: 1-2 Internal 5V (default) ; 2-3 External Power Supply
Jumper 2: 1-2 Enable (by computer on pin 14) ON; 2-3 Enable (pin 14) OFF (default)
Jumper 3: 1-2 Air Cooling always ON; 2-3 Relay 2 by Computer pin 16 but 16 is currently NC (Default)
Jumper 4: 1-2 Analog 0-10V Pin 17 ON (default); 2-3 Pin 17 changed to digital Hi-Lo
Jumper 5: 1-2 Manual (handset?) On (Default); 2-3 Manual Off.
Microstep Mode (on each Axis X, Y, Z but A is on separate JP-1635A driver board)
K1 K2
OFF OFF 1 = NO MICROSTEP
OFF OFF 2 microsteps per step of 1.8deg = 0.9 deg
ON ON 8 microsteps per step of 1.8deg = 0.25deg (default)
OFF ON 16 microsteps per step of 1.8deg = 0.125deg
K3 K4
OFF OFF 0% decay
ON OFF 25% decay
OFF ON 50% decay (default)
ON ON 100% decay
On you q whether you should set current to 3A. YES! for X, Y, Z.
Sine the PSU on mine is only 10 amps. I have connected the water pump to an another 24V psu instead to save all the current for the stepper motors.
I am now using 16 microsteps. Parallel port Pulse engine set to 45K. Motor 640 Pulse 15us and dir 5u sec to get router moving with NICE smooth sound and smooth G0 rapid movements.
The Toshiba driver chips can take 40V max, so I am going to replace the 24V fan first and then increase the voltage of the PSU to get better performance. With a 24V pump and 24V fan, it is not possible to increase the PSU voltage.
Someone has been using this board with 32V instead of 24V and the performance improved.