Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 13)

Rockwell Automation Publication 7000-IN006B-EN-P - May 2013 9
Chapter
2
PowerFlex 7000 Overview
The PowerFlex 7000 is a general purpose, stand-alone, medium voltage drive that
controls speed, torque, direction, starting and stopping of standard asynchronous
or synchronous AC motors. It works on numerous standard and specialty
applications such as fans, pumps, compressors, mixers, conveyors, kilns, fan-
pumps, and test stands in industries such as petrochemical, cement, mining and
metals, forest products, power generation, and water/waste water.
The PowerFlex 7000 meets most common standards from NEC, IEC, NEMA,
UL, and CSA. It is available with the world’s most common supply voltages at
medium voltage, from 2400-6600 volts.
The design focus is on high reliability, ease of use, and lower total cost of
ownership.
Topology The PowerFlex 7000 uses a Pulse Width Modulated (PWM) – Current Source
Inverter (CSI) for the machine side converter as shown in
Figure 2 on page 12 .
This topology applies to a wide voltage and power range. The power
semiconductor switches used are easy-to-series for any medium voltage level.
Semiconductor fuses are not required for the power structure due to the current
limiting DC link inductor.
With 6500 volt PIV rated power semiconductor devices, the number of inverter
components is minimal. For example, only six inverter switching devices are
required at 2400V, 12 at 3300-4160V, and 18 at 6600V.
The PowerFlex 7000 also provides inherent regenerative braking for applications
where the load is overhauling the motor (i.e. downhill conveyors, etc.), or where
high inertia loads (i.e. fans, etc.) are slowed down quickly. The drive uses
Symmetrical Gate Commutated Thyristors (SGCTs) for machine converter
switches, and Silicon-controlled rectifiers (SCRs) (for 18 pulse rectifier
configurations) or SGCTs (for AFE rectifier configurations) for the line
converter switches.