Rockwell Automation Publication 2099-UM001D-EN-P - December 2012 23
Install the Kinetix 7000 Drive System Chapter 2
To size a transformer for the AC power inputs to devices peripheral to the
Kinetix 7000 drive, refer to the manufacturer continuous output power
specification.
Circuit Breaker/Fuse Selection
The Kinetix 7000 drive uses internal solid-state motor short-circuit protection
and, when protected by suitable branch circuit protection, are rated for use on a
circuit capable of delivering up to 200,000 A. Fuses or circuit breakers, with
adequate withstand and interrupt ratings, as defined in NEC or applicable local
codes, are permitted.
The 2094-BL50 and 2094-BL75S LIMs contain supplementary protection
devices, but require a customer-supplied external line filter. See the Line Interface
Module Installation Instructions, publication 2094-IN005
, for power
specifications and more information on using the LIM module.
The Bulletin 140M motor protection circuit breakers are another acceptable
means of protection. As with fuses and circuit breakers, you must make sure that
the selected components are properly coordinated and meet applicable codes
including any requirements for branch circuit protection. When applying the
140M product, evaluation of the short circuit available current is critical and
must be kept below the short circuit rating of the 140M product.
In most cases, fuses selected to match the drive input current rating will meet the
NEC requirements and provide the full drive capabilities. Dual element, time
delay (slow acting) fuses should be used to avoid nuisance trips during the inrush
current of power initialization.
See Circuit Breaker/Fuse Specifications on page 151
for recommended circuit
breakers and fuses.
See Power Specifications on page 150
for input current and inrush current
specifications for your Kinetix 7000.
If using an autotransformer, make sure that the phase to neutral/ground
voltages do not exceed the input voltage ratings of the drive.
Use a form factor of 1.5 for three-phase power (where form factor is used to
compensate for transformer, drive module and motor losses, and to account
for utilization in the intermittent operating area of the torque speed curve).
For example: using a secondary of 480 VAC and a 2099-BM06-S with a rated
power output = 22 kW continuous:
22 * 1.5 = 33 kVA transformer
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