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.