Background
If you are troubleshooting a spindle issue on your PCNC 440, the Battery Test, is a good way to rule out your BLDC being at fault.
What You Need
1.5v battery (any AA,AAA, or C battery will work)
Some lengths of wire
Warning! Turn the machine off before touching any wiring of the spindle.
Before you remove any wires from the plug to the spindle, take a picture that shows what wire goes where.
Battery Test
Unplug the 8 position green plug and remove the 301(+5V), 302(SV), 300(COM), and 306(EN) wires from it.
Take a small piece of wire and fasten one end in position #5, where the 306(EN) wire was.
Take a longer piece of wire and twist one end to the free end of the small piece of wire and fasten both in position #3, where the 300(COM) wire was.
Take a another longer piece of wire and fasten one end in position #2, where the 302(SV) wire was.
Make sure the spindle is clear of any body parts/tooling. Bring the machine out of E-Stop and press the RESET button in PathPilot.
Touch the longer wire from position #3, where the 300(COM) wire was, and hold it to the negative side of the battery
Touch the other longer piece of wire from position #2, where the 302(SV) wire was, and hold it to the positive side of the battery.
If the spindle driver is good the spindle should start spinning in the 2600-3000 range (High Belt) and the spindle driver LCD screen will read numbers in the same 2600-3000 range. If the numbers are zero and the spindle is not spinning then the driver is bad. If the spindle driver is showing numbers in the 2600-3000 range but the spindle is not spinning in the 2600-3000 range (High Belt) or not spinning at all, check the spindle motor to see if it failed. https://tormach.atlassian.net/wiki/spaces/PCNC440/pages/4012114285/PCNC+440+Spindle+Won+t+Turn#Measure-the-motor-resistance-(%CE%A9)