Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 29)

Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014 29
AFE in IP20 2500 MCC Style Enclosure—Installation/Wiring Chapter 1
• The power source has intermittent voltage spikes in excess of 6000 volts.
These spikes can be caused by other equipment on the line or by events
such as lightning strikes.
• The power source has frequent interruptions.
Grounding Requirements The Active Front End Safety Ground-PE must be connected to system
ground.
Ground impedance must conform to the requirements of national and
local industrial safety regulations and/or electrical codes. Check the integrity of
all ground connections periodically.
Recommended Grounding Scheme
For installations in which the AFE is within an enclosure, use a single safety
ground point or ground bus bar connected directly to building steel. All circuits
including the AC input ground conductor must be grounded independently and
directly to this point or ground bus bar.
Figure 10 - Typical Grounding Example for AFE Frame 10 in IP20 2500 MCC Style Enclosure
PE PE
DC+
DC- DC+
DC-
PE
PowerFlex 750-Series Drive or PowerFlex 7-Class Drive
(can be located on the right or left side of the AFE;
PowerFlex 755 Frame 8 drive shown on right side)
Customer wiring or DC bus
bar splice required to connect
the AFE to the drive.
SHLD
To Line PE
PowerFlex AFE Frame 10
R (L1), S (L2), T (L3)
U (T1), V (T2), W (T3)