Hub and pitch

Hub and pitch

High-availability technology

Benefit from reliable solutions for fast pitch control and failsafe communication.

Back to Wind turbine generators


For optimum energy yield, the pitch system must operate reliably at all times in order to ensure exact control of the blade angle of attack. At the same time, the pitch system is the most important item of safety equipment as, if necessary, the blades rotate away from the wind in order to prevent damage.

Reliable communication via the slip ring is therefore essential. Solutions from Phoenix Contact can be used to configure failsafe communication in the hub. In addition, we can offer retrofit solutions that also allow you to configure an Ethernet connection retrospectively.

Your advantages

  • Fast and reliable pitch control with robust technology for the hub
  • Failsafe communication in the hub with redundant slip ring solutions
  • Rotor blade monitoring with monitoring of lightning strikes and blade load

Active pitch control

Components for pitch control  

Robust components for pitch control

All components for pitch control must be designed to withstand strong vibrations and variations in temperature. The HEAVYCON EVO heavy-duty connectors provide a reliable connection.

These requirements also apply to the safety products, as many functions must be designed safely. Surge protection protects pitch control from the harmful effects of surge voltages.

Data transmission

Data transmission in the hub  

Products for reliable communication via FO and copper slip ring.

There are two different methods available for data transmission in the hub. Since conventional slip ring transmission is often susceptible to errors, Phoenix Contact offers a combined solution:

SHDSL modems and WDM transmitters on the one hand provide fast communication via single-phase fiber optics for controlled operation and on the other hand provide the redundant path via the copper slip ring. Robust connectors ensure reliable communication around the slip ring.

Condition monitoring at the blade

Products for condition monitoring at the blade  

The LM-S is a complete solution for lightning measurement in wind turbine generators

Nowadays rotor blades are over 60 meters long and 10 tons in weight. The demands placed on monitoring have also changed as a result of these increased dimensions.

The rotor blade tension monitoring (RBTM) system can be used to measure the loads on the blades. This means that you can detect damage at an early stage or optimize the pitch behavior.

In addition, the LM-S lightning monitoring system can be used to measure lightning strikes and therefore plan maintenance work more efficiently.

Reliable and cost-effective data transmission

Ensure high-performance data communication between hub and nacelle. WDM transmitters enable error-free data transmission with single fiberglass. Additional SHDSL modems, which communicate via the copper slip ring, enable double redundancy to be established. Even if two out of the four slip ring channels fail, communication will still be possible. Combining the two systems is a cost-efficient solution for achieving high operational reliability.

Technology for pitch control

Redundant communication solution for secure data transmission in the hub


Unit 15C, 906-930 Great South Road, Penrose
Auckland 1061
New Zealand

Phone: 0508 474 636
Toll Free (Local)
09 950 8495


LM-S lightning monitoring system

LM-S monitors Guangxi wind farm with a power output of 1.5 MW.

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