Help with Fanuc 6m control

[inaman]

Hi i just got a ENSHU YUASA ACCU-MILL with a fanuc 6m controler. it seems to be missing the i/o board. is it worth my time and money to replace the board?
and if so how much +/- would a replacement cost


these are the boards in her right now
PC MODEL-B A20B-0008-0440A
ROM A16B-1200-0150 A
CRTC / PUNCHER A20B-0008-0430A
ADD AXIS (P/C) A20B-0007-0090D
BMV 64-2 A87L-0001-0016 08F

Thank you for the help

Ian

[rolltide1966]

I have a Mori Seiki MV-45 w/ Fanuc 6M control. I just had my X axis servo motor rebuilt. I re-installed and now I have a Servo 400 alarm. I checked all connections from servo drive all the way to master pcb...all okay. I can turn the ball screw by hand...so should not be getting this servo overload alarm. BTW, I tried P,Q, cancel while powering up to erase alarm, (I thought maybe it was still stuck from original problem....no such luck).
Anyone have any ideas? I don't. I need this machine bad!!!

[underthetire]

Did you reset the overload relay in the servo amp? It's behind the top board on the bottom of the drive.

[rolltide1966]

Thanks for the info. I did as you said. Now I have a 401 alarm coming up and a HCAL red led on my X axis board. I hope you have a solution.

[underthetire]

High Current Alarm
1. Bad/shorted motor or cable. You need a mega ohmer to test correctly.
Megohmmeter - Megohmmeters - Electrical Power Testing - 3T105 : Grainger Industrial Supply
these work good, and are the cheapest you can get.
2. Bad transistors in the drive unit.

[rolltide1966]

Thanks for all of the help. It was, as we all supposed, (but didn't want it to be), a bad cable bringing power to the servo drive motor. I have run into this problem over the years more often than not. I guess the reason I didn't explore this last night, it, as you all know is a ROYAL pain in the rear. Nevertheless, I repaired it and am up and going. Thanks again. If I can ever be of help to anyone, please don't hesitate to email me.
BTW, to any of the members of the trades: This is THE most comprehensive data base on CNC problems out there.