Retrofitting a 1986 Maho MH400E

I speak german, so if you have any questions on it, ask away.

Hi Brad,

i am native german.....

please do the following checks:

-post photo from the TNC and Screen after power up
-post photo from the S5 after power up and after switching on estop with the bridged TNC contact
-Does the hydraulic Pump and the Bed Lube pump start, after switching e stop?
-check the 24V beetween 140/141 Page 8252, better with oszilloscop to see if all Diodes are ok.

With this control you are able to drive the axis manual, without an speed command from the tnc. look at page 8264 (connection control input Indramat).
9 XYZ ist the first input driven by manual control
10 XYZ ist the second input driven by the TNC, on the right side you see the axis enable section.
You wrote you can drive in one direction, check the following:

-is +15V and -15V ok? (L6, 12,11,14)
-Relais 7k2 and 7k3 are for the direction, do booth of them switching if you press an plus or minus button for an axis?
-check the voltages the wrote down on the sheet
-On Input L1 9 X has to be an +Voltage for moving and an -V for the opposite direction.
-check the inputs from the TNC L1,2,3 10, they have to be ~0V

Hello db 1981
It is Friday tomorrow in New Zealand. We will carry out your checks as soon as Brad is available. Thank you for your help.
Cheers
Chris

Chris, that is a tasty DSG 13x you hid behind the MAHO.
Mark

Yes, I bought the D.S.G 13" x 30 since the Maho. I swore I was not going to buy any more machine tools. The D.S.G was with a machinery dealer but likely had been rescued from a scrap yard.
The machine had been greased and nothing moved. A week of dirty work, replaced a few bronze bushings and I have a really nice tight D.S.G with hardened bed ways. These days if a machine is not metric it is obsolete. American decimal measure is no bother to me.
I wish the Maho was as easy for me to fix.
Thanks for your interest. Cheers
Chris

Photos, or it didn't happen . My Dad served his time at MoW in Dundin and always raved about DSG lathes. I have never used one.

Did you and Brad make any progress on the troubleshooting steps detailed by db?
Mark