Hello
I am (was) repairing a Pfauter 320, coq wheel milling machine. It is from 1979, and the question is whether to continue. The Electronic gear box between the spindle and the table is probably broken, at least I have 2 analog PCBs (no 47) which acts in 2 ways: The original board drops to -15V for motor speed (on a 10V signal), and when running is jumps from +15 to -15 causing the old servo drive to burn. My guess is that it caused the problem in the first case. The replacement board gives 0 speed when working. This causes the gear box to give a "synchronise not ok" error, what a surprise. When start the motor (servo) by a small signal, the gearbox reacts and we can see that it tries to adjust. By a small switch from our signal to its own cause the motor to stop - zero speed. We tought that it might not start by some reason.
All this gives a number of questions, so we migth replace the gear box. It only gets some signals from 3 inc encoders (spindle, table and the Y axis for tilted wheels), gives -10 to +10V out - but has a large number of thumb wheels for control. Replacing will be "fun" because of the 188 wires from thumb wheels.
We dont know all what is going on in there.... so.... replacing it can be a long run.
There are a number of questions:
1) does it work with the new Mentor 2 servo drive? Is the new servo the problem? [replaced Heldt&Rossi] 2) encoders give signals, and seem ok, but....? 3) 11 PCBs from 1979, lots of logic and analog stuff mixed, lots of things I do not understand. It is full of surprises 4) old (E)proms, for decoding such as 5610 and 82s23/123 (they are the same)Next, we have no idea what else there might be of problem, not to mention the future.
Can I replace the gear box? Or repair it? Or should I just hang myself for getting involved in this project?
WBR Sonnich