Being used to servos the first thing I test is the estop. Saves damage
to expensive mechanics.
Once I was testing a new interface. Running it from lower left to upper
right. It was gaining about .1" every pass. ... after about 4 passes it
took off for the upper corner at full speed: 400 ipm. My hand made it to
the big red button ahead of the upper corner but knowing the axis estop
limits were there and working gives piece of mind. Especially when the
combined weight of the saddle and the table is 700 Kg.
Dave
On 5/1/22 8:59 AM, Chris Albertson wrote:
There is a good chance there was a wiring error in you original setup. The
fact the E-stop did not work tells me there was a design error. E-Stop
should never fail, or rather if it does fail, the machine stops. If the
inputs on the drivers are blown, that says the same thing. Smaething was
wrong as that should never happen.
Diagnosing a system that has a design fault is really hard because our
brain tends to think of how a correct machine would function or how the
machine we THOUGHT we built should function.
The best plan is to ignore LCNC the BOB and all for now and see if you can
drive the motor drivers with a simple signal generator and no computer.
If this does not work, you need to replace or repair the drivers before
you think about reconnecting a computer. If you need to buy some test
equipment, now is the time. At least a cheap square wave signal
generator and a cheap $12 logic analyzer t go with your multimeter.
Finally, you should draw a schematic of how you propose to connect the
computer and post it here for others to review. They will check if
nothing else the e-stop design to see that it is failsafe and also check
that you have the power and computer parts properly isolated. It seems
this may not have been the case in the past, and you don't want to simply
put it back the way it was.
First step is to verify the motors and drivers work independently of
computer control.
On Sun, May 1, 2022 at 7:53 AM Alan Condit <condit.a...@gmail.com> wrote:
Hi Guys,
I was machining a part on my X2 Minimill. Suddenly it left the programmed
track (spoiled the part) and didn’t respond to Estop. I powered the system
off manually raised the Z axis and tried turning it on so I could home it,
smoke started coming from the controller. So I powered everything down and
started troubleshooting.
There were two chips on the CandCNC Mini-IO BOB that had let out the magic
smoke. I had a spare BOB that I built using the Gecko G540 schematic. So I
replaced the other BOB with it. The drives in the controller are Superior
Electric SS2000MD4 drives.
When I got everything put back together and checked the wiring everything
looked good so I tried powering it up. When I tried homing it the traces
move in AXIS but there is no movement on the machine. The motors hold
position so the output of the drives is active. Is it likely that I blew
out the inputs on the drives?
Thanks,
Alan
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