Sinumerik 810d Waiting For — Nck Connection

For a CNC machinist, those four words are the digital equivalent of a flatline.

A faulty CCU (Compact Control Unit) board often results in this hang during the boot sequence. sinumerik 810d waiting for nck connection

If the voltages are good and the cables are tight, the problem may lie in the NCK itself. The CCU board contains fans that cool the processor. If these fans are clogged with conductive graphite dust (common in machining environments), the board can overheat or short out. For a CNC machinist, those four words are