davesoldmachines
Plastic
- Joined
- Oct 8, 2021
I have a 1994 Lagunmatic 3516 VMC with a reference problem. It was running fine Monday then Tuesday it wouldn't reference. I found an old thread here LagunMatic VMC 3516 Dynapath/Autocon controls HELP with someone else having the same issue. They solved it eventually by discovering the scale had been installed incorrectly. Lots of good advice along the way but I still can't solve the problem. Machine has a Dynapath Delta 40 control, SEM servos, Heidenhain glass scales on X and Y, and Glentek drives. What should happen when homing is it travels to a limit switch, backs off, then continues on until it reaches a marker. What it's doing is all of that except after it backs off and then returns to look for the marker position it continues on until it reaches the -X limit switch. There is no encoder on the motor. It uses a black magnet on the side of the scale to trip a marker switch.
Trouble shooting I have attempted so far includes swapping the sensor between X and Y - no change. Continuity of the wires seem good checked with an analog ohmmeter. Unplugged and plugged them all back in as well to rule out a loose connection. I do have the wiring schematic and found blue and black "marker" wire locations on port 1 terminal (X). Jammed wires into those connections and used those as a temporary switch to simulate the pulse. No effect still. I also see X Y and Z reference wires on J1A input. I assume those are for the mechanical limit switches.
I should state that it is otherwise jogging and attempting to reference correctly so I think the scales are fine. It just isn't getting the marker signal.
My first question is am I jumpering the marker signal correctly? I'm going between the two pins labeled marker (blue) and marker (black). I use the feed rate override to pause the travel when it's attempting to home so the X-Reference limit switch is made. Then jump the marker wires.
What else can I try?
Also I'd gladly hire someone local to fix it for me if there is anyone in the Seattle area that knows much about these old machines.
Trouble shooting I have attempted so far includes swapping the sensor between X and Y - no change. Continuity of the wires seem good checked with an analog ohmmeter. Unplugged and plugged them all back in as well to rule out a loose connection. I do have the wiring schematic and found blue and black "marker" wire locations on port 1 terminal (X). Jammed wires into those connections and used those as a temporary switch to simulate the pulse. No effect still. I also see X Y and Z reference wires on J1A input. I assume those are for the mechanical limit switches.
I should state that it is otherwise jogging and attempting to reference correctly so I think the scales are fine. It just isn't getting the marker signal.
My first question is am I jumpering the marker signal correctly? I'm going between the two pins labeled marker (blue) and marker (black). I use the feed rate override to pause the travel when it's attempting to home so the X-Reference limit switch is made. Then jump the marker wires.
What else can I try?
Also I'd gladly hire someone local to fix it for me if there is anyone in the Seattle area that knows much about these old machines.