Siemens SINUMERIK 840D

FADAL MACHINING CENTERS
36 PRE-INSTALLATION PROCEDURES MAN-0126_R1
• intermediate metal conduit
• electrical metallic tubing or cable armor
4. One end of the supplemental grounding conductor shall be attached to the VMC’s
ground bus. The other end shall be effectively bonded to a copper cold water pipe
that is in direct contact with the earth for 10 feet or more (See Figure 2-5: Bond
Grounding Conductor to Copper Cold Water Pipe).
5. Connections shall be made so that they are electrically continuous.
Figure 2-5: Bond Grounding Conductor to Copper Cold Water Pipe
WARNING!
Many problems that are difficult to diagnose can occur if the VMC is not properly
grounded. Proper grounding cannot be overemphasized.