R2E3 Boss8 Drive Fault?

[s1j1m10]

My old BP is coming up with Error4000 after about 1 hours running. (Manual says that this is error 4 in group 1 ie a Drive Fault). If I leave it for some time I can run again for another hour or so??? I have checked on the NC400 drives and sure enough one of them showed a drive fault light on the side so I switched the boards around to see if the fault followed the board but it is not the NC board as a different board lit up later??? Has anyone had a similar problem or can they suggest where I should start looking next?

This m/c now works fine with the door open and a big fan cooling the nc400 drives. The fuses are fine but I cannot find out why 2 of the fans are Kaput yet!!!

[scotts-repair]

Mine just started doing the same thing. Did you solve your problem?

Scott

[s1j1m10]

Problem not solved yet. Have read through the thread on Boss8 error 4000 but not tried to check any voltages. Have switched boards a number of times now but problem moves between NC boards and position randomly so must be on underlying circuits. Am going to try a big fan to try to keep the drives cooler as this oly occurs when the machine has been running for some time. If this doesn't work them I am going to start to check connections. Let me know if you find out anything with yours.

[Newby2]

I have this happen (error 4000) a couple of times so far and just tap the E stop, rehome the machine, and continue on

Steve

[machintek]

It could be in the motors as they are DC motors and have brushes which wear.

George

[Newby2]

I just solved a problem on my R2E3 Boss8 I from a thread that machintek wrote about a year ago. George suggested giving the IC's a crackle test and cleaning the connectors on all the boards. I just did this about 10 minutes ago and lo and behold, the machine is back up and running! Thanks George!
Steve

[s1j1m10]

Have tried tapping the E stop but this didn't work. Will have a look at the motor brushes next and try cleaning up a few things.

[s1j1m10]

Looks like I may have solved this problem. We noticed that it always happened after running for a couple of Hours and can now see that the 2 fans on top of the NC400 boards are not running so we think that it is just an overheating problem.

[s1j1m10]

OK I have found the problem --but not the solution. The 2 fans on top of the nc400 drive boards are not working. This means that the drives are probably overheating and there must be a safety cut out son after a couple of hours I get the drive error. Now it seems to be strange to me that both fans are Kaput so I am not looking throught the maintainance manual for the fuse numbers etc. In the mean time I have the door open and a big fan blowing lots of air over the drives which seems to work but looks bad!!!

[Newby2]

According to the fuse listing I have, there are 2 fuses located on the axis drive mounting board. They are #25 and #26, MDL,1A,250V style. I believe you may have to pull the NC 400 drives to get at them easily. There are 4 fans located in the drive enclouser that I have and two of them are controlled by fuse #5.
Steve

[Newby2]

I would like to post a new thread here but I can only enter a subject line and cannot enter a sublect matter...any leads?
Steve

[s1j1m10]

Tested these fuses and all OK. The 2 fans on the top of the nc boards do not work but the 2 fans at 90 degrees (facing the door) do work!!!
To post a new thread just go to the opening page of the Forum (in this case Bridgeport & Hardinge Mills) and there is a button at the top left.
Anybody know if T3 transformer powers anything else? These fans seem to be wired directly into T3.

OK now after checking there appears to be a relay between fuse 5 and the Fans which seems to be called CR1 in the diagram!! This does not work according to my meter so I am now getting a "KRP11DG24" Potters & Brumfield replacement unit to try. Luckily leaving the door open with a big fan blowing on the drives still seems to work just fine!! Maybe I could put the mill in a wind tunnel!!!