Ok folks,
I have some new info to post. When checking voltage as Val & Roman of Super PID asked, here is what I found. When the S-PID is under manual control via the speed pot, (where it works perfect), the voltage is 0 -4.8 vdc. When under Mach 3 control via pwm output the voltage is 0 - 3.7 vdc. Obviously the S-PID isn't the problem, it's Mach 3 or the computer running it.
I'm thinking the computer. When I was sorting out getting my Panasonic servo drives and Mach 3 to play together I found the direction signal from the computer was this same 0 or 3.7 vdc. But this signal was good enough for the drives after feeding it to the Scorpion differential output board which outputs both 0 and 5 vdc from a separate 5 vdc power supply.
Before I checked & found direction signal at 3.7 I was told by Hood I should get either 0 or 5 vdc depending on direction command from the computer. As I said, the 3.7 seems to be fine for direction thanks to the Scorpion but it isn't fine for the pwm input to the Super PID.
Anyone have any ideas or suggestions as to why my computer only puts out 3.7 vdc instead of the expected 5 vdc ?
Thanks in advance, Rick