Rockwell Automation Publication 2099-UM001G-EN-P - December 2022 21
Install the Kinetix 7000 Drive System Chapter 2
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 140M/MT Motor Protection Circuit Breakers (MPCBs) 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/MT MPCB, evaluation of the short circuit available current
is critical and must be kept below the short circuit rating of the
140M/MT MPCB.
In most cases, fuses that are 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 spurious 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.
Enclosure Selection
To assist you in sizing an enclosure, the following example is provided. The
example system consists of the following components.
• 2-axis Kinetix 7000 servo drive system
• ControlLogix® chassis and modules
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 480V AC and a 2099-BM06-S with a rated
power output = 22 kW continuous:
22 * 1.5 = 33 kVA transformer
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