Control Functions
Motor Start-up/Shutdown
The Vertex-Pro provides three selectable start-up modes—Manual, Semi-Auto, and Sequence. In the manual mode,
the throttle valve or inlet guide vane (IGV) is opened by an operator manually raising/positioning the Vertex-Pro’s
valve demand signal. In the semi-automatic mode, the valve/vanes are automatically opened to the user-defined
position at a user-defined rate. In the sequence mode, the Vertex-Pro automatically controls valve position based on
a defined sequence in order to prevent a motor overcurrent condition.
Motor Current Limit Control
When configured, this control function senses motor current and limits compressor load to protect against motor
overload conditions.
Anti-Surge Control
The anti-surge PID uses compressor pressure, temperature, and flow signals to calculate each compressor stage’s
operating point, then compares this value to the specific surge map and surge control line to position the respective
recycle valve, and hold the compressor away from surge.

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