Fanuc C Series Drive Error Code 5.

[Ox]

Big Bertha (2 axis lathe) has not ran much the last few years for whatever reason.
(no work for her)
I had a part to put in it recently and found that the Z axis drive was dark.
I made doo on another machine.

I found a surplus place nearby that had some amps F/S and we got one.
Now I need Bertha again, and so I installed the drive, and it comes up "5." (with the decimal)
I called the guy and he brought over a nother amp to try.
That amp was dark. Nothing...

So I ran back to his shop and they gave me two more to try.
First one looked good at first. I shut the power back off and then hooked up the encoder cable and motor leads.
Cycled the power back on, and I got "5."

So - I still have one that I haven't tried yet.
I put my old one back in, and it's still dark.
I searched ALL OVER this drive to see if I could find some [external] dip switches - not that I can find.
Checked the power @ 220/230/ and 240.

All incoming power is daisy chained from my X amp that is fine.
So I moved my Z encoder cable and motor leads over to the X amp, and all is fine yet.

So I put amp #4 in, and it instantly comes up as "5."

According to this web page:

TriStar CNC

Tri Star CNC Services helps you identify FANUC servo drive errors by translating alarm codes and lay out a plan for repairing your CNC machine controls.

www.tristarcnc.com

That says that:

5 (dot)

Excessive regenerative discharge alarm.

But secondary power hasn't even been thrown to the drives yet, let alone any regen. (braking)
This is just on power up!
This is with only the 240 3/ph wires hooked up so far!

What on Earth could I possibly be dooing wrong?


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Think Snow Eh!
Ox

 

[Vancbiker]

If you want to test the drive like you are doing, you need a jumper between TH1 and TH2. You also need a jumper between RC and RI.

 

[Ox]

Houston, we have lift off!


Thanks Mr. PNW


---------------

Think Snow Eh!
Ox