Rockwell Automation Publication 2097-UM001D-EN-P - November 2012 61
Connecting the Kinetix 300 Drive System Chapter 4
Isolation Transformer in Grounded Power Configurations
When using an isolation transformer, attach a chassis ground wire to the neutral
connection. This grounded neutral connection does the following:
• Prevents the system from floating and thereby avoids any high voltages that
might otherwise occur, for example due to static electricity
• Provides a solid earth path for fault conditions
Three-phase Power Wired to Single-phase Drives
This example illustrates grounded three-phase power wired to single-phase
Kinetix 300 drives when phase-to-phase voltage is within drive specifications.
Figure 36 - Single-phase Amplifiers on Three-phase Power (WYE)
(1) Contactors (MI, M2, and M3) may be optional. For more information, see Understanding the Machinery Directive, publication SHB-
900. AC line filter is optional, but is required for CE compliance.
Feeder short circuit protection is not illustrated.
ATTENTION: If the supply transformer is an auto transformer (not
recommended), a chassis earth ground should not be added. A chassis earth
ground should already be included elsewhere in the system and adding another
would create a short.
L1
L2
L3
IPD
L1
L2
IPD
L1
L2
IPD
L1
L2
L1
L2
L3
L2
L3
L1
2097-V32PRx
Transformer
(WYE) Secondary
Grounded Neutral
Kinetix 300 Drives
(System A)
Single-phase AC Input
Input Fusing
M1
(1)
M2
(1)
M3
(1)
Ground Grid or
Power Distribution Ground
Bonded Cabinet
Ground Bus
Kinetix 300 Drives
(System B)
Single-phase AC Input
Kinetix 300 Drives
(System C)
Single-phase AC Input
Input Fusing
Input Fusing
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