I did look, and cannot find any "list" of error codes for your controller. (Mine is a HUST and completely different). "LU" is not very intuitive as an error message. Hell, for all I know it could stand for "Loose Union" or "Limit U____"...or, as you surmise...something like "Line Undercurrent" (although I'm not sure it even checks for that).
Here's what I would try: 1) Unplug the machine from the wall and plug it back in again. 2) Move the gantry slightly by hand from its "home" position. Just a little in X & Y 3) Check the cable connection from the handheld to the controller box on both ends 4) See if it works 5) Let us know
Post by Axiom Tool Group on Sept 17, 2019 8:26:01 GMT -5
LU is actually LV....the digital display is limited, so it appears as a "U".
It does in fact indicate a low voltage state.
If you are reading 220 at the outlet, then its possible that you simply have a blown fuse inside the control box. However, most supplies will not read exactly 220...we see them range from low 200s to almost 250V. The machine itself is rated for 220 +/-5%, so you have an acceptable range of 208-232ish.
We see them run fin on higher, but start getting concerned when the supply begins to climb above 240V.
If under 208, or unbalanced...then you may receive an error.
As for balance, when checking the outlet voltage...its best to check each leg against ground and compare. You should see that they are both roughly balanced at around 110-115V. Then when checking across the two legs you should see your rough 220V reading.
Inside the white control box, there are several fuses. These are simple 10amp 250V fuses that can be found locally.
Check them one at a time, so you do not get them mixed up with the other lower voltage lines.
These fuses effect the incoming voltage and can block it from going farther and result in that error.
*Fuses can blow from voltage surges or even from aggressive cutting.