[Titaniumboy]

I am looking for help in troubleshooting and repairing a malfunctioning Leadshine 3ND883 3-phase stepper motor drive. The symptoms were that the drive would display a red alarm LED within a minute or so of running. No obvious burn marks are apparent on the circuit board or on the Phoenix-style power connectors.

Leadshine 3ND883 manual
http://www.leadshineusa.com/UploadFile/Down/3ND883m.pdf

Steven Rhine's excellent pictures of the 3ND883 circuit board
https://www.stevenrhine.com/?p=2687


I have an electrical background, but I am not very experienced with board level troubleshooting and repair. I have a multimeter, but not an oscilloscope or benchtop power supply. I can solder but have not done any SMT work before. I've been thinking of getting an oscilloscope and benchtop power supply for awhile now, and this drive repair might finally provide a reason.

Background: A local high school recently had a Z-axis stepper motor drive fail on their Tormach 24R CNC router. The problem was resolved when they ordered and installed a new 3-phase stepper drive (Tormach 32000 / Leadshine 3ND883).

https://www.cnczone.com/forums/torma...c-tormach.html

[joeavaerage]

Hi,
fairly ambitious repair.

You need a stepper motor to hook up to it. You need a power supply to match that in the machine.

You will need a scope, two channel minimum, but because the switching is bi-polar you will need at least one, but preferably two differential probes
of at least 1MHz and at least 250V common mode rejection.

I worked repairing welding equipment for seven years, much of it inverter technology. My differential probe has proven invaluable, it is 25MHz and 1400V common mode.
Downside is they are not cheap, but in order to probe the output of a bipolar inverter you need it.

https://nz.element14.com/testec/1510...tive/dp/354971

Craig

[Titaniumboy]

Thanks for chiming in Craig.

Well, that sounds daunting. How about a less ambitious repair attempt similar to what Steven Rhine did? Or this chap in the video below?

https://youtu.be/9k3EW_ZbpQ8?si=8VVxsinO8UAC6dqm


I’m a little unclear how to test the FET’s or the LM317 voltage regulator IC while they are still on the circuit board.