[Dan Fritz]

You may have a limit switch that has stuck open or become shorted by the washing process. Look for limit switches on each axis (in both + and - direction). There are frequently TWO limit switches in each direction. One limit switch simply causes an Overtravel (OT) alarm, and you can then jog in the oposite direction to move off the switch. The second switch is an "Extreme" overtravel switch, and it is designed to protect the ballscrews and stop the servo positively if the first switch should fail, or if the CNC should ignore the OT switch. On some machines, that switch is tied to the 24v E-stop circuit, which will simply make the machine come up "NOT READY". Other machines, however, use the 100vac circuit to enable the servo contactors for that same purpose. If your machine is wired like this, and one of these switches was stuck on, filled with water, or otherwise defective, you will get your 401 servo alarm. Also look for damaged cables from these switches to the CNC, and inspect any connectors you may find along these cables. These extreme overtravel switches are usually wired as "normally closed" and are in series, so actuating any one of them breaks the circuit and shuts down all the servos.

[padobranac]

Thanks for help, machine was in "middle" position, far from limit switches.

Actually I have just solved the problem

Silly me, we have reconected main power input to tramsformer, and one wire (one phase) was not tightened well, and there were just two phases connected.

(nuts)

Thanx