Rockwell Automation SA3100 AutoMax Distributed Power System User Manual
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AutoMax Distributed Power System Overview
2.4.5 1567 Power Max™ Drive
The 1567 Power Max™ drive is made up of two main systems, the Rectifier and the
Inverter. Together the Rectifier and Inverter convert fixed frequency, fixed voltage from
the AC line to variable frequency, variable voltage power for driving an AC induction
motor. The drive is mounted in a lineup of five NEMA 1 general purpose enclosures,
housing the rectifier, PMI subsystem and DC/Link, three-phase inverter, AutoMax rack
and DC brake, and liquid cooling system.
The AutoMax™ Processor coordinates and controls the entire drive system. The
Universal Drive Controller (UDC) module in the AutoMax rack runs the drive’s major
control loop and communicates over a fiber-optic link with the Power Module Interface
(PMI) subsystem. The PMI runs the Inverter’s control algorithm, commands gate firing
of the Inverter’s GTOs, and monitors operation of the drive.
The Inverter is a voltage source GTO-based power bridge, with neutral point clamped
topology to achieve three-level operation. It is designed to drive induction motors at
variable speeds using pulse-width-modulation (PWM). The Inverter is available in
power ratings up to 3500 HP (for overload capabilities, check with the factory).
The Inverter’s PMI subsystem includes an eight-slot PMI rack and modules
(figure 2.8), the Power Interface Board (PIB), a DC Brake/Pre-Charge Control board,
and LEM power supplies. The first four slots of the PMI rack contain the Power Supply
module, the PMI Processor module, the Resolver & Drive I/O module, and the Medium
Voltage Technology module. The remaining four slots contain Gate Driver Interface
modules, one for each level of the three-level Inverter and a fourth for the DC brake
and auxiliary circuits.
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