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Hi, Did you ever get a resolution here? I'm having exactly the same problem.

"p.p.s... looking at fleabay pictures - there are a pair a BIG filter caps in the drive.. if one of those warms up and then begins to leak current you'd see the overload and the reason for the...

cjifisher, thanks for your detailed answer.

I have a 30hp RPC. The spindle motor is 5.5kw (7.5hp). The x/y/z axis motors are ~1hp each (Z is bigger than x/y) and there's a small 3 phase...

Do you happen to have a schematic of this board? It would really help!

"You main problem is the RPC"

Why do you think this is true?

To my understanding, a rotary phase converter makes power just exactly the same way a power plant makes power, by spinning a 3 phase...

Yes, LED #2 comes on during failure.416664

I replaced the isolation amplifiers and it didn’t help the issue.

Thinking I might have a hardware issue, I removed the spindle and 2 speed drive system. All of the bearings seem to be in good...

@harrimansat, thanks for your reply.

I had already ordered new replacement isolation amplifiers (A76L-0300-0035) based on your previous post.

Will get a scope on it before and after, see how it...

"]I had a nightmare with a similar driver and a intermitent failure :)"

What was your result? Did you ever find root cause?

Well, still failure.

I replaced all four IGBT's. It was a bit fiddly getting the wires off the old and on the new. Whomever mentioned the strong need to label everything beforehand was right on. ...

Further debug that points further to the IGBT's.

The manual shows six test points to look at:

CH3 and CH4 to 0 Volts:

Spec: Should be a sine wave with average amplitude ~2.5V and...

I bought four new IGBT's. Fuji from Japan. Will see if they work!

For other debug, I checked all the fuses the manual recommend (F5, F6, FA, FB, FC, FD, FE, FF, FG), all good. The belts look...

Thanks for the advice. Great idea to check the belts... they are ~30 years old and I don't think I've ever looked at them.

I see you can get the transistors and also the electrolytic caps new...

Hi;

I have a Fanuc Series 3 AC Servo Amp driving my spindle.

The Amp/Spindle works great but after prolonged (>20Minutes) of high speed operation, the spindle alarms and shuts off showing an...

Hi All;

So I solved my own problem. The wound was entirely self inflicted.

I converted my Fanuc 6MB electronics to a cool new LinuxCNC based system driven by Jon Elson @ Pico's PPMC boards,...

Bump, anyone?

Hi: I have a VMC that had a Fanuc 6MB controller. I've converted it to Linux CNC but kept the AC Spindle servo unit and I'm having a problem.

The systems works great most of the time. The...

Bump, anyone?

Hi;

I have a Bridgeport BOSS 8 CNC. It's give me good service for years. For a long time, I drip fed the machine from an old PC with EZUTIL from an old version of FEATURE CAM. Everything worked...

I measured the current when operating the spindle amp from an external power supply, the circuit takes 28mA, so that seems the issue. Has anyone else run into this?

Hi; I've been retrofitting a Fanuc 6MB based VMC with modern electronics. I used the Pico PPMC board set (Jon from Pico has been unbelievable with support) and LinuxCNC. It's going great.

My...

Anyone?

Hi; I have an Okada VM500 VMC. I'm retrofitting with LinuxCNC and all new electronics. It's been a good project to learn about how it all works. It's going great but I have a question about the...

I spent some quality time in the control box with my Fluke multimeter and ohm'd out some clues.

OP and OL and indeed "neutral" for the +24V DC. OP comes off a full wave bridge rectifier 180...

Hi All;

I'm retrofitting a 1980's VMC with Fanuc 6MB electronics. The retrofit is going great, Jon from Pico has been very helpful. I've hit the stage of the project were I'm reverse engineering...

Hi; I'm retrofitting a Fanuc 6MB milling machine with LinuxCNC and new electronics.

I captured the parameters from the existing machine just in case BUT, I wonder if there's any way to read the...

I'm retrofitting an old Fanuc 6MB milling machine with new electronics. LinuxCNC, Pico Systems DAC and I/O, AMC servo drives.

I ran across this terrific guide sheet that shows the pinouts for...

Al, thanks.

OK, so I found three pretty big (1500W each) power supplies for a good price. Lin-Mot 0150-1845, they are 75VDC output, well within the 40V-190V input range for the AMC servo controllers.
...

Thanks Al_The_Man.

The existing system has a big 3-Phase transformer and the existing X-Y-Z units are run from 185V 3-Phase outputs. I'm up for generating a DC supply from those. Will search...