Originally Posted by
fanucman
never mind that..
heres what you do..
first you said you have a scope.. you need to measure PA to 0 volts and Pb.. while running the spindle at like 100 rpms..
the wave form will be a sine wave it should be .6 volts peak to peak for both pa pb.. if its not you need to adjust the sensor in the spindle motor to 6 thousands and recheck.. also check the square waveform on ch 7 and 8 i believe (you might wanna call fanuc on that one) it should be 50% duty for both channels
If that sensor has scratches on it it will need to be replaced.. if you do any adjustment to the sensor also make sure you check the run out of the rotor with a mic..
Ok I know it has been a while but I just did this and I got 0.5v peak2peak waves had 90 deg shift didn't see another wave form coming out of plug
if that all looks good you need to check the transistors inside the spindle amp.. the way you do that is by first labeling all the wire locations THIS IS EXTREMELY IMPORTANT..
check for any shorts or inconsistencies between the transistors (the large black ones)..
Of the big black ones their is TM1-4 SM1-3 and DM1. Do all of these need to be checked or just some?
Thanks Drew
If I had something important to say it would be here.