Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC - Manual (Page 14)

1-2 Installation/Wiring
The Safety Ground terminal (PE) must be connected to the building
grounding scheme. Ground impedance must conform to the
requirements of national and local industrial safety regulations and/or
electrical codes. The integrity of all ground connections should be
periodically checked.
For installations within a cabinet, a single safety ground point or ground
bus bar connected directly to building steel should be used. All circuits
should be grounded independently and directly to this point/bar.
Figure 1.1 Typical Grounding
Safety Ground Terminal - PE
The DBU safety ground (PE) must be connected to the customer
grounding scheme or earth ground. This is the safety ground for the
DBU that is required by code. This point must be connected to adjacent
building steel (girder, joist, a floor ground rod, bus bar or building
ground grid) see Figure 1.1. Grounding points must comply with
national and local industrial safety regulations and/or electrical codes.
For additional information refer to publication DRIVES-IN001A-EN-P.
Grounding Requirements
+DC
PE PE
+DC
- DC - DC
R (L1)
S (L2)
T (L3)
Drive
Ground Grid, Girder or Ground
Rod (Building Ground Potential)
DBU