Rockwell Automation Allen-Bradley Kinetix 3 2071-A10, User Manual

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Rockwell Automation Publication 2071-UM001E-EN-P - November 2013 57
Connect the Kinetix 3 Drive Chapter 4
Single-phase Power Wired to Single-phase Drives
These examples illustrate grounded single-phase power wired to single-phase
Kinetix 3 drives when phase-to-phase voltage is within drive specifications. The
ungrounded power configuration does not include the ground connection
labeled as ‘optional’ in these figures.
Figure 26 - Single-phase Grounded Power Configurations
Reducing transformer output reduces motor speed. Feeder and branch short
circuit protection is not illustrated.
Isolation Transformer in Grounded Power Configurations
When using an isolation transformer, attach a chassis ground wire to the neutral
connection. This accomplishes the following:
•
Prevents the system from floating and thereby avoids any high voltages that
can otherwise occur, for example due to static electricity.
•
Provides a solid earth path for fault conditions.
ATTENTION: If the supply transformer is an auto transformer (not
recommended), a chassis earth ground must not be added.
A chassis earth ground must already be included elsewhere in the system, and
adding another creates a short circuit.
L1
L2
L1
L2 (Neutral)
L1
L2/N
L1
L2/N
E
L1
L2
L1
L2
E
IPD
L1
L2
L3
L1C
L2C
IPD
L1
L2
L3
L1C
L2C
Transformer Secondary
Transformer Secondary
Bonded Cabinet Ground Bus
Ground Grid or
Power Distribution Ground
AC Line
Filter
AC Line
Filter
230V AC
Output
230V AC
Output
Bonded Cabinet Ground Bus
Ground Grid or
Power Distribution Ground
Kinetix 3 Drive
Single-phase
IDP Terminals
Kinetix 3 Drive
Single-phase
IDP Terminals