Rockwell Automation Publication 2198-UM002E-EN-P - February 2018
35
Plan the Kinetix 5700 Drive System Installation
Chapter 2
Transformer Selection
The power supplies do not require an isolation transformer for three-phase
input power. However, a transformer can be required to match the voltage
requirements of the power supply to the available service.
To size a transformer for the main AC power inputs, refer to the Kinetix 5700
power specifications in the Kinetix Servo Drives Technical Data, publication
.
Circuit Breaker/Fuse Selection
The Kinetix 5700 power supplies 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) and 65,000 A
(circuit breakers).
Refer to
, on
, for the wiring diagram.
IMPORTANT
When using an autotransformer, make sure that the phase to neutral/
ground voltage does not exceed the input voltage ratings of the power
supply.
IMPORTANT
Use a form factor of 1.5 for three-phase power (where form factor is used to
compensate for transformer, drive modules, motor losses, and to account for
utilization in the intermittent operating area of the torque speed curve).
IMPORTANT
A line reactor must be used if the source transformer is greater than 150
KVA, max and 3% impedance, min.
EXAMPLE
Sizing a transformer to the voltage requirements of this power supply:
2198-P141: 31kW x 1.5 = 46.5 KVA transformer.
IMPORTANT
When using an iTRAK power supply, connect the DC-bus power supply to
only grounded-wye power distribution.
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.