Rockwell Automation Publication 2198-UM002G-EN-P - February 2019 43
Plan the Kinetix 5700 Drive System Installation Chapter 2
In Enable Request mode, you must issue an MSO instruction (after AC is
applied and CIP_Axis_State = STOPPED) to enable voltage regulation on the
regenerative bus supply and an MSF instruction to disable voltage regulation.
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 224 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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