Transformer selection, Circuit breaker/fuse selection – Rockwell Automation 2097-Vxxx Kinetix 350 Single-axis EtherNet/IP Servo Drive User Manual User Manual
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Rockwell Automation Publication 2097-UM002A-EN-P - December 2013
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Install the Kinetix 350 Drive System Chapter 2
Transformer Selection
The Kinetix 350 drive does not require an isolation transformer for three-phase
input power. However, a transformer can be required to match the voltage
requirements of the controller to the available service.
To size a transformer for the main AC power inputs, refer to
Transformer Specifications for Input Power
.
Circuit Breaker/Fuse Selection
The Kinetix 350 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 that are
adequate and can withstand 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 meets the NEC requirements or applicable local codes, and provide the full
drive capabilities. Use dual element, time delay (slow-acting) fuses to avoid
nuisance trips during the inrush current of power initialization.
See Kinetix 350 Drive Power Specifications in Kinetix Servo Drives
Specifications Technical Data, publication
r input current and
inrush current specifications for your Kinetix 350 drive.
Refer to
Circuit Breaker/Fuse Specifications
for recommended circuit
breakers and fuses.
IMPORTANT
If you are using an autotransformer, make sure that the phase to neutral/
ground voltages do not exceed the input voltage ratings of the drive.
IMPORTANT
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-LM = 3 kW continuous x 1.5 = 4.5 KVA transformer.