Rockwell Automation Publication 6000-TD004D-EN-P - November 2017 9
Chapter 1
Functional Descriptions
Introduction
The PowerFlex 6000 is an adjustable speed AC drive that is particularly suitable
for new and retrofit centrifugal fan and pump applications. Air-cooled PowerFlex
6000 drives are designed to maximize energy efficiency by enabling soft-starting
and variable-speed control in medium voltage, normal duty applications.
To achieve the low input harmonics and near-unity power factor that make this
an ideal solution for standard motors, the drives utilize Cascaded “H’” Bridge
(CHB) topology. This proven CHB topology combines an integrally mounted
phase-shifting isolation transformer with series-connected power modules for
each phase. In addition to stepping down the input voltage, the isolation
transformer also provides two other principal functions:
• Mitigate common mode voltage stress so motors with standard insulation
levels can be used.
• Reduce Total Harmonic Distortion (THD), due to the phase shifting of
its secondary windings, so input side harmonics don’t negatively impact
the plant or utility power grid.
System Settings
The system settings include the following functions:
• Control Owner
on page 10
• HMI Display on page 12
• Nameplate on page 13
• Ramp on page 14
• Rated Frequency on page 15
• Stop Mode on page 15
• Motor Direction Control on page 16
• Switch Frequency Settings on page 16
• Tre n d s on page 17
• VF Curve Setting on page 17
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