I have a 1995 Leadwell V40 with a Meldas M50 control.
Last night, the machine errored with the code "M01 OPERATION ERROR - 0101". According to the manual, this means the control doesn't have an operation mode selected (i.e. jog, handle, MDI, memory, home, etc). They suggest checking the switch.
I called Mistu and he had me go into the diagnostic screen and check the X100 memory value... when I change the switch on the panel between the different modes, I see the X100 value change each time. He said 3 bits of this number should change, but I am only seeing one bit change. 3 bits changing doesn't seem right to me... it's an 8 bit number and in each of the 8 mode switch settings, 1 of the 8 bits is 1 where the rest are all 0's.
Anyway, I checked the switch itself and I don't see anything wrong with it. The Mitsu rep said most likley the problem was "in the ladder" and I would need to contact Leadwell.
Leadwell say they could send someone up, but I'd be paying the plane ticket and hotel just to look at it.
What is the ladder? It isn't described very well in the manuals... it sounds like a series of checks that the machine builder programs into the control like "check if door interlock is open, if so, go to step to, if not, error... then check if coolant switch is on, if so.....". Is that about it? Or am I not understanding what it is?
The Mitsu rep said I should check the ladder documentation and go through it. I don't have any ladder documentation that I can find. I have en electrical manual for the machine, but to me it seems that it is getting the mode switch signal, so I don't understand why it's telling me it can't operate because no mode is selected.