Retrofitting a 1986 Maho MH400E

I am retrofitting a mh600c. Can I get some info on your connections between the 7i77 and the 3trm2? Also if I could get your PID settings to give me a place to start. Thank you.

Hi,
My PID settings are posted about 10 pages back. Since there is no PM on this forum, please PM me on CNCecke.de or Madmodder.net (same user name), so I can send you my wiring diagrams.
Mark

Hi there,

Mark "convinced" me to join this forum and post my 2 cents.

After swapping the EXEs the drift showed up on the other axis.
This tells me that all other components involved like 3TRM, glass scale, etc. work faultlessly and the cause must be the EXE itself.

The deviation increases after a few minutes or in other words with warming up components.
I do not have the schematics at hand but from former repairs on PCBs I assume that a (Tantal/Filter) Capacitor is defective. They tend to leak and bypass and increase current draw/voltage drop over time.

Could you please measure the current (over time) on 12V and 5V, Mark ?

Regards,
Hanno

FYI: I'm retrofitting a MH400E build in 1986 as well

Thanks Hanno. Welcome.

I am not sure If I'll get time to do this today, but will get try an get the current measurement as soon as possible.
Mark

And Hanno, we look forward to photos of your MAHO.
Mark

Hi Mark,

nothing spectacular, yet.
Wired up the relays for a first test on the weekend and color coded the servo controller wires.
As you already mentioned in an email, every MAHO is different.
I have this cooling unit mounted in the cabinet door, therefore the relay PCB is located in the lower right corner rotated by 90°.
As you can see, I installed an additional 7I74 Eight Channel RS-422/485 interface which connects with the
7I84 Isolated remote field I/O card and a 7I73 Pendant/control panel interface which will be located in the control panel.

More pics will follow.