Fanuc 0MB control with a06b-6058-h321 S series triple servo amp.
Machine powers on, when it tries to power on the servo amp it alarms out 401
When I watch the sequence at the drive, the contactors pull on and the DRDY light comes on briefly then the cotactors open and the DRDY led goes off. The green 5V led stays lit.
No red alarm LEDs indicate on the drive. No breakers are tripped.
Most of the research I have done points to a loss of the 100 volt power somewhere on the drive. Also it appears the drive needs a MCON signal from the control? Is signal generated by the control which then turns on the drive and then the drive generated a DRDY signal, or it a signal that the control generates after the DRDY signal is recieved from the drive?
Some of the cables going to the pendant were damaged in shipping, which originaly popped a 5.0 fuse on the control power supply, That problem was found and corrected,and obvious wire damage has been repaired, but it is possible I may have other damage in a cable beneath the jacket that I cant see.
How do I tell if the drive is receiving the MCON signal from the control. It must come in on the 3 HONDA connectors to the board, but I can't find the pins to check. I believe it is a LOW signal.
I just wanted to eliminate any problems that might lie outside the drive before I yank it out and start poking around in there.
Anyone have any suggestions?