Rockwell Automation SA3100 AutoMax Distributed Power System - Manual (Page 21)

Overview of the AutoMax Distributed Power System 2-1
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Overview of the AutoMax Distributed
Power System
The AutoMax Distributed Power System is based on a distributed approach to task
processing and to control of power conversion for AC and DC drive control. The
benefits of this distributed architecture are:
• Improved performance through the use of modular components and high-speed
RISC microprocessors
• Greater application flexibility
• Faster installation/commissioning
• Lower installed cost
Separation of high level control from power conversion is the chief hallmark of the
Distributed Power drive architecture. A distributed approach makes it possible to
divide the control scheme into different levels, using the existing AutoMax Processor
module for higher level control algorithms and drive coordination, the Universal Drive
Controller module for outer control loop processing, and the Power Module Interface
for real-time control of the Power Module.
The Universal Drive Controller (UDC) module in the AutoMax rack is used to control
one or two drives. Both AC and DC drives can be controlled from one UDC module.
Up to 10 UDC modules can be mounted in an AutoMax rack permitting control of up to
20 drives from a single rack. Drive types can be mixed throughout the process
allowing each section to be customized with the most appropriate power technology. A
common software interface makes the different power technologies transparent to the
user. Table 2.1 illustrates this distributed architecture for all drive types.
A noise-immune fiber-optic link is used for all communications between the UDC
module and the Power Module Interface (PMI) located at the Power Module up to 750
meters (2500 feet) away allowing tight synchronization of the UDC and PMI. The
control type (i.e., current for DC, vector and brushless for AC) is determined by the
operating system contained in the PMI. The PMI runs the regulation algorithm;
collects and sends diagnostic data, performance data and I/O data to the UDC
module; and produces firing signals for the power devices.
Hardware in the Distributed Power System incorporates precise diagnostics and clear
LED fault displays to pinpoint failures. Comprehensive fault reporting makes it
possible to detect errors systematically through application programming. The
modular design of most system components permits rapid hardware replacement
when malfunctions do occur.
Because power conversion hardware can be located near the motor (and the process)
at a significant distance from control equipment, PMIs and Power Modules can be
clustered like motor control centers, substantially reducing field wiring requirements.
AutoMax racks can be mounted in a location that provides a clear view of the process.