Woodward The Vertex-Pro controller includes PID control & protection functions

Applications

The Vertex-Pro anti-surge control is designed for industrial-sized axial or centrifugal compressors with 1 to 4 recycle

loops. Standard off-the-shelf models are available and field configurable for 1 or 2 recycle loop applications, while

custom models are available for larger 3 or 4 recycle loop applications. This controller includes specifically designed

algorithms and logic to start, stop, control, and protect industrial compressors driven by a stationary speed motors or

variable-frequency drive motors. OEM-qualified algorithms are used within the Vertex-Pro for straight-through, iso

cooled, double-flow, single side-stream, and back-to-back compressor applications.

Designed to replace CCC Series-3 and Series 3++ anti-surge controllers, the Vertex-Pro can be configured to

function like these controllers but uses two-times faster scan rates, improved surge anticipation logic, and one

integrated package for all control functions (anti-surge control loop 1. anti-surge control loop 2. 

performance control, and dual-redundant control).

The standard Vertex-Pro models (1 & 2 recycle loops) are field-configurable, allowing users to configure/select the

specific control algorithm required for the specific compressor loop and application. Since 3–4 loop compressor

applications tend to be complex, Vertex-Pro-C models (3 & 4 recycle loops) are custom programmed by Woodward

engineers, ensuring that the correct control and optimization algorithms are used to meet the specific application

requirements.

For critical applications requiring increased reliability and availability, users can order dual-redundant control models,

which have manual switch-over and automatic fail-over capabilities. These redundant control models also allow users

to replace/repair modules and perform program changes while the compressor is operating on-line, thus greatly

improving system availability.

The Vertex-Pro controller includes the following PID control & protection functions:

 Anti-Surge PID Control

 Rate PID Control

 Boost (open-loop backup line response)

 Surge Recovery

 Surge Minimum Position

 Start, Purge, Stop, Shutdown, & Zero Speed Sequencing Positions

 Alarm & Shutdown Logic

Alternatively, the following functions can be configured, depending on the application requirements:

Motor

 Current limit PID Control

 Start Sequence Logic

Compressor

 Throttle or Inlet Guide Vane Ramp Loading (motor protection)

 Performance Control (compressor suction or discharge pressure, flow, or external signal)

 Load Sharing (parallel compressors up to three trains)