Rockwell Automation Publication 8720MC-RM001K-EN-P - September 2018 43
Connect the 8720MC-RPS Unit Chapter 5
Input Power Configuration
The 8720MC-RPS units are designed to operate in grounded WYE
environments.
The grounded (WYE) power configuration lets you ground your three-phase
power at a neutral point. This type of grounded power configuration is
required.
Figure 19 - Grounded Power Configuration (WYE Secondary)
Refer to Typical Input Power Diagrams beginning on page 49 for input power
interconnect diagrams.
L1
L2
L3
L1
L2
L3
P
N
AC Line Filter,
Circuit Protection Devices,
Varistor/Harmonic Filter,
Magnetic Contactor,
and Line Reactor
Transformer
Three-phase
Input VAC
Phase Ground
Transformer (WYE) Secondary
Bonded Cabinet
Ground
Ground Grid or
Power Distribution Ground
Connect to 8720MC-RPS
ground stud.
8720MC-RPS Unit
(8720MC-RPS065 unit
is shown)
ATTENTION: Ungrounded systems do not reference each phase potential to
a power distribution ground. This can result in an unknown potential to earth
ground.
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