Please help! Z-axis transistor keeps failing when I turn spindle on - CNCzone.com-The Largest Machinist Community on the net!

jderou · #1 03-26-2009, 10:58 PM

This is getting old, I can't seem to fix this problem. I balanced the converter (250, 250, and 246v with spindle off). Turned the amperage down to 7a on each axis (was 8a on z, 8.5 on y and 8 on x). The transistor still failed! It happens when turning the spindle on (or off?). I turned it on and off about 5-10 times and checked it and it was dead. I noticed with the amp clamp on, when I turn the spindle on, the amperage drops way down briefly on the x and y, but the z holds steady. Now I'm out of transistors and I need to run this thing this weekend

jderou · #2 03-27-2009, 08:09 AM

I just realized that I don't think I have ever blown one when the program turns the spindle on, only when I use the manual switch on the machine. Any connection there?

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