Rockwell Automation Publication 2198-UM005C-EN-P - February 2022 27
Chapter 2 Plan the Kinetix 5300 Drive System Installation
Transformer Selection
The servo 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 drive to the available service.
To size a transformer for the main AC power inputs, refer to the Kinetix 5300
power specifications in the Kinetix 5700, 5500, 5300, and 5100 Servo Drives
Specifications Technical Data, publication KNX-TD003
.
Follow these guidelines when specifying the use of line reactors:
• For single-phase drives up to 138V line to line or line to neutral, a line
reactor must be used if the source transformer is greater than 15 kVA,
max and 3% impedance, min.
• For single-phase drives 170V…253V line to neutral or three-phase drives
170V…253V line to line, a line reactor must be used if the source
transformer is greater than 75 kVA, max and 3% impedance, min.
• For three-phase drives 342V…528V line to line, a line reactor must be used
if the source transformer is greater than 150 kVA, max and 3%
impedance, min.
See Kinetix 5700, 5500, 5300, and 5100 Servo Drives Specifications Technical
Data, publication KNX-TD003
, for Kinetix 5300 drive specifications, including
power ratings.
Circuit Breaker/Fuse Selection
The Kinetix 5300 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 200,000 A (fuses, UL applications),
10,000 A (miniature circuit breakers), and 65,000 A (molded-case circuit
breakers).
For the wiring diagram, refer to Power Wiring Examples
on page 170.
IMPORTANT When using an autotransformer, make sure that the phase to neutral/
ground voltage does not exceed the input voltage ratings of the drive.
IMPORTANT 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).
EXAMPLE Sizing a transformer to the power requirements of the drive:
2198-C2030-ERS = 5.02 kW x 1.5 = 7.53 KVA transformer (minimum)
2198-C4015-ERS = 2.78 kW x 1.5 = 4.17 KVA transformer (minimum)
ATTENTION: Do not use circuit protection devices on the output of an AC drive
as an isolating disconnect switch or motor overload device. These devices are
designed to operate on sine wave voltage and the drive’s PWM waveform does
not allow it to operate properly. As a result, damage to the device occurs.
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