46 Rockwell Automation Publication 2198-UM002G-EN-P - February 2019
Chapter 2 Plan the Kinetix 5700 Drive System Installation
• Powering multiple (two or more) regenerative bus supplies from the
same AC input-power source.
– Switching ripple from each regenerative bus supply can interfere with
other regenerative bus supplies on the same AC input power source.
• Powering 2198-Pxxx DC-bus power supply and 2198-RPxxx
regenerative bus supply from the same AC input-power source.
– Switching ripple from the regenerative bus supply can impact the
temperature of DC-bus capacitors in the DC-bus power supply. In
this use case, a line reactor is required in the AC input-power string
leading to the regenerative bus supply.
– Line reactor in the AC input-power string is not required for the
DC-bus power supply in this use case, but is recommended for the
prevention of issues caused by other use cases.
• Powering two or three 2198-P208 DC-bus power supplies from the
same AC input-power source that share the same DC-bus.
– In this use case, a line reactor is required for each 2198-P208 DC-bus
power supply to make sure that they share current more evenly.
Use these equations to calculate the impedance of the DC-bus power supply,
regenerative bus supply, or transformer to check the percent source-impedance
relative to the power supply to make sure it is not less than 0.5%. An additional
transformer or line reactor is required in this use case.
DC-bus Power Supply or Regenerative Bus Supply Impedance (in ohms)
Transformer Impedance (in ohms)
Transformer Impedance (in ohms)
Z
drive
=
V
line-line
3 * I
input-rating
* % Impedance
Z
xfmr
=
V
line-line
3 * I
xfmr-rated
% impedance is the nameplate impedance of the transformer.
Z
xfmr
=
(V
line-line
)
2
VA
* % Impedance
* % Impedance
Z
xfmr
=
V
line-line
3 * I
xfmr-rated
% impedance is the nameplate impedance of the transformer.
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