Hello All,
So I see very little activity here, anyway I will share my progress on the control panel. I have almost finished everything, but had to make some changes to the schematic.
I wired a NO contact of the E-STOP relay in the LIMITs chain so that when an E-stop is triggered it stays in this state forever. I have to push the override button to switch it on. I added another relay that tells the E-STOP circuit that I have mains. If I have blackouts or deep brownouts I got an E-STOP condition.
When I firstly reviewed Kreutz's HP schematic I wondered why he put the optoisolation on the E-STOP input/output. Today I no longer do that. I have formerly wired a loop that covers the 4 drives, but had frequent RESETs of the UHU chip when running. Very annoying and took me some time to realize what was the reason. As soon I disconnected the E-STOP IN pins, all problems went away. I will have to figure out something to make it work as I wanted in the first place.
I tested the limit switches. It takes about 15-22mm so that X axis stops from a speed of 5m/min with a 5 Ohm resistor across the capacitor bank . Not very satisfactory but good as a start.
Homing with the index pulse and the proximity switches works perfectly. Tomorrow I will put some dial indicator to see what is the repeatability. The spindle is still not ready but I am eager to see it milling.
Todor  |