Manual 26489V1
Vertex-Pro Motor-Driven Compressor Control
Woodward
1
Chapter 1.
General Information
1.1—Introduction
The Vertex-Pro is a microprocessor-based control with integral application
software designed to control a motor and its one or two-loop compressor load.
Three and four loop compressor stages may be an option for some systems. The
compressor control architecture is patterned after the 505CC-2 compressor
control. The compressor anti-surge control provides the user with a choice
between two algorithms—the standard Woodward anti-surge algorithm or a
universal surge curve design. The standard algorithm compensates for changing
gas/process conditions, while the universal algorithm uses an invariant
coordinate system that is immune to such changes. Like the 505CC-2, the
Vertex-Pro uses configurable software for maximum field flexibility.
The control hardware uses the MicroNet™ Plus. The MicroNet Plus is a 32-bit
microprocessor-based digital and a VME-based controller, modular control
system with redundant or simplex CPU, power supply and I/O module options.
CPUs and I/O modules may be simplex or redundant, depending on customer
requirements. A simplex system can be upgraded to redundant system by simply
adding a second CPU and I/O modules and changing a minor software
configuration. I/O modules allow for hot replacement without removing control
power.
The MicroNet Operating System, together with Woodward’s GAP™ Graphical
Application Program, produces a powerful control environment. Woodward’s
unique rate group structure ensures that control functions will execute
deterministically at rate groups defined by the application engineer. Critical
control loops can be processed within 5 milliseconds. Less critical code is
typically assigned to slower rate groups. The rate group structure prevents the
possibility of changing system dynamics by adding additional code. Control is
always deterministic and predictable.
Communications with the MicroNet platform are available to program and service
the control as well as to interface with other systems (Plant DCS, HMI, etc.).
Application code is generated by use of Woodward’s GAP program or
Woodward’s Ladder Logic programming environment. A service interface allows
the user to view and tune system variables. Several tools are available to provide
this interface (see Engineering and Service Access). Communication protocols
such as TCP/IP, OPC, Modbus
®
*, and other current designs are included so that
the user can correctly interface the control to existing or new plant level systems.
*—Modbus is a trademark of Schneider Automation Inc.
1.2—Specifications and Compatibility
For environmental specifications and MicroNet compatibility information, please
refer to the appropriate appendix in this manual.
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