Pitch Control System Enclosures

Variable frequency drives and servo amplifiers generate significant heat loads within sealed enclosures that lack natural airflow. To manage this, Frigate incorporates thermostat-controlled fans that activate when internal temperatures approach 45°C thresholds, keeping electronics within their operating specifications. For higher heat loads, heat exchanger installations can transfer internal heat to external nacelle airflow without compromising IP ratings. Beyond that, cold climate installations receive heater provisions that prevent hydraulic fluid from becoming too viscous, which would otherwise slow pitch response during emergency shutdown sequences. 

Variable frequency drives generate conducted and radiated emissions across broad frequency spectra, which can potentially interfere with turbine SCADA systems. To tackle these challenges, Frigate implements comprehensive shielding strategies – 

• Shielded cable glands – EMC-rated entries with 360° shield termination maintain enclosure shielding effectiveness above 60dB 

• Conductive gaskets – Metal mesh or finger stock gaskets on door seams prevent RF leakage through panel gaps 

• Internal grounding – Star-point grounding topology separates noisy drive grounds from sensitive control circuits 

• Filter mounting – Line reactor and EMI filter provisions at power entry points attenuate conducted emissions 

When properly implemented, this EMC design prevents false fault signals and communication disruptions during pitch operations, ensuring reliable turbine performance over time.