Retrofitting Maho MH600E 1989 - Meas 5i25 & 7i77

Today´s update:

Got the Heidenhain linear scales/encoders working.
The pinout was quite easy with the shematics from HH. The guy on the phone just needed the serial number which is printed on the board.
The 7i77 manual even tells you how to wire the encoders.
The 7i77 asks for QA0 AN QB0
I´ve wired up like this

7i77	EXE
QA0	Ua1
/QA0	/Ua1
GND	0V
QB0	Ua2
/QB0	Ua2
+5V	+5V
IDX0	???
/IDX0	???

I couldn´t get the EXE Index signal to work. i´m not even sure how to wire it. I´ve got 3 cables left. UaS looks to me like it should be the index thing, but when i handwheel the Y-Axis over the index position the signal won´t trigger. I´not sure if i can even see it in HAL view.

Next i´ve noticed a strange behavior when i connected all three scales to the 7i77, that the computer randomly restarts, sometimes only when i move one axis. I then added my lab power supply to power the 7i77 5v into TB1. Jumpers are set to seperate vin and vfield.
Same behavior. The pc won´t restart when i power everything up first, and then start the pc at the very end. Not sure if this is a solution or not. I´m not sure if i´m missing something there.

Because i had a "run" of success I´ve decided to add one of the indramat drives to the 7i77. Quite easy job, remove the old cable from pin 7,9 and 10.
7 is shielding
9 is 10v+-
10 is 10v+-

so i´ve only connected two cables to 9 and 10, the other end to the "drive" connector on the 7i77

pin 1 and 2 two are not used because the maho enables the drives when no emergency is triggered and everything is in good state.

So i´ve connected pin 2 and 4 to 9 and 10 on the Indramatdrive. Then i powered the machine on and told someone to smash the Emergency stop when the axis runs away. But that was not need (spoiler: "yet"). The machine made a small 3mm run and ended with a Linuxcnc triggered emergencystop dued "following error".
After switching my cables 9 and 10 the axis did not move on powerup. So this was okay. Next would be to try some movement.

At this point you really want a hand on the emergency stop

I´ve chosen a small single movement of 5mm in any direction. The machine just ran like 300mm until i hit the emergency button on Linuxcnc. The guy on the hardware e-stop did not understand the situation and did not press it... If you do that with other persons involved explain them at first what should happen and how far you intend to move

So tomorrow I´ll try to tune the axis. The movement is like 5x off. And the speeds are crazy.
Any advice on tuning the axis with belt driven ballscrews ? Pncconig wizard wants to know thread pitch and gearratio etc. how to ?

Onkelmat wrote: .......... I then added my lab power supply to power the 7i77 5v into TB1. Jumpers are set to seperate vin and vfield.

I really wish you would stop doing that, almost had a heart attack reading this
In the 7i77 manual it clearly states:
Set the 5i25/6i25 to power the 7i77 logic side with the respective jumpers on the 5i25/6i25 and 7i77
OR
again
OR
set the 5i25/6i25 to NOT power the 7i77 and power the 7i77 by supplying 5V to TB1
NEVER power the TB1 while you have the 7i77 set to get power from 5i25/6i25 and the 5i25/6i25 is set to deliver power to the 7i77.
The way you have it, you are back powering the whole 5V rail on the PC and everything in between.

5V on the TB1 has nothing to do with the Vin and Vfield and how they are set.

The crashing PC might be due to to much power draw from the 5V rail on the PC through 5i25/6i25 and 7i77 by the encoders, so change the jumpers on the 5i25/6i25 and 7i77 to have separate 5V on the 7i77, then add another 5V 2A power supply to TB1 on the 7i77.

Onkelmat wrote: Any advice on tuning the axis with belt driven ballscrews ? Pncconig wizard wants to know thread pitch and gearratio etc. how to ?

Can you turn the motor by hand?
Mark a spot on the motor and on the moving part, turn the motor one full turn, measure how much the moving part has moved.
that will be the pitch, and the gear ratio 1:1. >Even if the gear ration is not 1:1, set it to 1:1 if you use this method to figure out the pitch.
Later on when you get the stuff working properly, you can fine tune the distance by using the Calibration menu, this will get you close enough, and much, much closer than what you have now.
Also, do NOT do anything without wiring the drive enable to 7i77 as it is not clear from you post if you already have that working.
That is a must, not an option, as any error or runaway will be immediately stopped by linuxcnc.

tommylight wrote:

Onkelmat wrote: .......... I then added my lab power supply to power the 7i77 5v into TB1. Jumpers are set to seperate vin and vfield.

I really wish you would stop doing that, almost had a heart attack reading this
In the 7i77 manual it clearly states:
Set the 5i25/6i25 to power the 7i77 logic side with the respective jumpers on the 5i25/6i25 and 7i77
OR
again
OR
set the 5i25/6i25 to NOT power the 7i77 and power the 7i77 by supplying 5V to TB1
NEVER power the TB1 while you have the 7i77 set to get power from 5i25/6i25 and the 5i25/6i25 is set to deliver power to the 7i77.
The way you have it, you are back powering the whole 5V rail on the PC and everything in between.

5V on the TB1 has nothing to do with the Vin and Vfield and how they are set.

The crashing PC might be due to to much power draw from the 5V rail on the PC through 5i25/6i25 and 7i77 by the encoders, so change the jumpers on the 5i25/6i25 and 7i77 to have separate 5V on the 7i77, then add another 5V 2A power supply to TB1 on the 7i77.

I set the jumpers as following BEFORE powering TB1 with a separate power supply
5i25 -> no power to daughter cards W1 and W2 down
7i77 -> no power from fpga card, and no connection between vin and vfield. W5 right, W1 right

Anyway, sometimes the computer restarts. I´ll try to see if i can makeout the restart problem.

tommylight wrote: Also, do NOT do anything without wiring the drive enable to 7i77 as it is not clear from you post if you already have that working.
That is a must, not an option, as any error or runaway will be immediately stopped by linuxcnc.

I´m not sure if that is enough, but Linux turned "machined enabled" off in that certain situation. That triggers the emergency chain on the Maho.
If Linux has situations that keeps the machine in "enabled state" while a critical error occurs, then i´d change the wiring. I´ll think of it tomorrow if i change it right away as you mention.

Onkelmat wrote: I set the jumpers as following BEFORE powering TB1 with a separate power supply
.

Oh good. Me very glad !