Micura - Can't enable drives.

[[Gr...]]

Got a bit of a head scratcher on my hands. My Zeiss Micura was working fine on Friday and refuses to operate today after being left on all weekend. The status log does not have any enlightening information. On the control box, the only relevant symbol is an inverted triangle with an exclamation point in it. The drives on the device refuse to engage. I press the "M" button on the control box, I hear the button click followed by a rapid click-click of a relay inside the control box. The drives do not engage, and the light above the "M" does not flash or come on. It's got 5.1 bar of Nitrogen being delivered to the machine, so it's not air pressure. I can also hear the air system power up when I unlock the joysticks, and power down 15 minutes later. The head and bridge are not on the limit switches and are sitting about the middle of the machine. The PC connects with the CMM, as I can see the XY coordinates change as the bridge is gently pushed in the XY directions. I swapped the control box with another Micura we have, and the issue persists on the original machine.

What should I check next? Is there a way to find out which sensor is stopping the drive?

Edited 1 hour ago