Retrofitting a 1986 Maho MH400E

In 2014 i drawn a big logic diagramm to know what i have to code.

I would love a copy of that logic diagram.

So far I have been working through and modifying my MAHO E5170 wiring diagrams, to record all the changes that need to be made.

Luckily this MH400E doesn't have the Phillips glass scales. It has 11µA Heidenhain LS403's. The board in position 7 of my cabinet photo is a Heidenhain EXE which will be reused. This is the planned wiring of the scales into the 7i77.


The servo amp is an Indramat 3TRM2. The +/-10V velocity command wiring looks pretty easy, but I haven't yet decide what to do with the drive enable.

Currently the Indramat releases the Z Axis brake and enables the three drive channels as soon as it is powered on, and E-Stop released. 7S1 is the switch to override the E-Stop and release the brake. It looks like the 7i77 wants to enable the drives itself, which would also be safer during the testing phase of the retrofit. I don't want that brake off before the drives are enabled. There will be at least one unused relay on the MAHO Relay board, so I could use that and let LinuxCNC have control of the Z axis brake.

Since I'm starting from zero with the Maho, and near Zero with LinuxCNC, as I am learning, I am writing a manual "How to retrofit a MAHO 400E" to capture all this information which has been so generously shared by others. Once this is done, I will post this manual, as it has been differcult to draw all the pieces of this puzzle together, and a single source would hopefully assist others in the future.

Thanks for the clarification of HAL verse component for this application Andy.
Mark

While waiting for the last Elektrolytic cap to arrive, Ive been doing some more cleaning and inspection. Noticed that the backshell of the hydraulic pump motor is damaged. Will have to measure through to see if this is part of the reason it wouldn't start.

A friend beat out the dent in the spindle motor's blower shroud. Needs a little paint touch up.


The table is back on. There are four mill scars in it.


I see back in 2012, someone set up Eagle to generate HAL files based on schematics.
wiki.linuxcnc.org/cgi-bin/wiki.pl?Eagle2HAL
Seems like a pretty cool idea. What became of it? I found no mention of it in the forum.
Mark

I am drawing the gearbox control flow chart. Does the MAHO 400E move the output stage to neutral during every gear change?
Mark

After getting nothing done in August (on vacation with the family) except picking up my set of Mesa cards, I started replacing the electrolytic caps today. The new ones (Blue) are quite a bit smaller than the originals (Gold).
I guess technology marches on.


Came across this odd one in the Phillips PSU module.



It has three pins, although both the one marked T2 that to the right go into the same solder field. Is this two caps in one can, and they have only used one? Any reason not to replace it with the single cap I bought?
Mark.

Some caps have extra terminals just to hold them more firmly.

I would be surprised if the new cap has the same spec as the old one. Have you compared ESR?

Thanks for the prompt response. I havent.

I am replacing the caps based on the internet wisdom that 30year old electrolytics have a good probablity of exploding whenpowered up. I bought replacements based on capacitance, voltage, tolerance and thermal limits.

I would need to know the original ESR specs for those caps, rather than their current values right? I don't have a frequency generator to supply a known AC frequency either.
Mark