Rockwell Automation Publication 2198-UM002L-EN-P - October 2021 41
Chapter 2 Plan the Kinetix 5700 Drive System Installation
Bus Voltage Loop Parameters
The regenerative bus supply uses an active control loop to maintain the DC bus
voltage at a specified level (or reference) and has two settings for the Bus
Voltage Reference Source (Axis Properties>Bus Voltage Loop category>
Parameters):
• Automatic (default) setting: The converter optimizes the
BusVoltageReference for the best converter performance
• Manual setting: You configure the desired BusVoltageSetPoint value for
the BusVoltageReference signal
In Manual mode, the BusVoltageSetPoint must be greater than 5% of the peak
input AC voltage (or it is clamped automatically) with a maximum of 747V DC.
Boost voltage is the difference between the rectified AC voltage and the
BusVoltageSetPoint.
Refer to Configure Regenerative Bus Supply Axis Properties
on page 216 for
more information.
IMPORTANT
Setting a manual fixed DC-bus voltage sets peak motor output power
performance regardless of the variance of the input AC rms. Higher
boost voltage increases Total Harmonic Distortion (THD), reduces
efficiency, and increases acoustic noise, but this is normal and
expected. For example, optimal operation is best achieved for 460V AC
motors when the input AC rms is also at 460V AC nominal, Automatic
mode is selected, and the DC-bus voltage regulates at approximately
683V DC.
>
2
• 1.05
Bus Voltage Set Point (V )
DC
AC Input Voltage (V ) •
RMS
–
2
Boost Voltage = Bus Voltage Set Point (V )
DC
AC Input Voltage (V ) •
RMS
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