Rockwell Automation Publication 2097-UM001D-EN-P - November 2012 21
Installing the Kinetix 300 Drive System Chapter 2
Transformer Selection
The Kinetix 300 drive does not require an isolation transformer for three-phase
input power. However, a transformer may be required to match the voltage
requirements of the controller to the available service.
To size a transformer for the main AC power inputs, see Circuit Breaker/Fuse
Specifications on page 22 and Kinetix Servo Drives Specifications Technical
Data, publication GMC-TD003
.
Circuit Breaker/Fuse Selection
The Kinetix 300 drives use 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 100,000 A. Fuses or circuit breakers, with
adequate withstand and interrupt ratings, as defined in NEC or applicable local
codes, are permitted.
The Bulletin 140M and 140U products 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/140U product, evaluation of the short circuit available current is critical
and must be kept below the short circuit current rating of the 140M/140U
product.
In most cases, class CC, J, L, and R fuses selected to match the drive input current
rating will meet the NEC requirements or applicable local codes, 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 Kinetix 300 Drive Power Specifications in Kinetix Servo Drives
Specifications Technical Data, publication GMC-TD003
for input current and
inrush current specifications for your Kinetix 300 drive.
See Circuit Breaker/Fuse Specifications
on page 22 for recommended circuit
breakers and fuses.
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 single and three-phase power (where form factor is
used to compensate for transformer, drive, and motor losses, and to account for
utilization in the intermittent operating area of the torque speed curve).
For example, sizing a transformer to the voltage requirements of catalog
number 2097-V34PR6 = 3 kW continuous x 1.5 = 4.5 KVA transformer.
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