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CANopen tower oscillation sensor for wind power

Lenord + Bauer (Germany) provides the CANopen-capable GEL 3010 acceleration sensor. It may be used for two-axis tower oscillation monitoring in wind power systems. The measuring range is 20 m/s2 with a resolution of 0,01 m/s2.

THE SENSOR MEASURES THE ACCELERATIONS in the X and Y direction using so-called micro-electro-mechanical systems (MEMS) that operate like spring-mass systems. For CANopen connection the 5-pin M12 connector is used. The pin assignment accords to the CiA 303-1 recommendation. Diagnostics LEDs as defined in the CiA 303-3 are available. The sensor supports the CiA 401 CANopen profile for I/O devices. The node-ID assignment in the CANopen network is done via the LSS (layer setting services) as specified in the CiA 305.

The IP67-protected sensor in an aluminum housing works at temperatures from -40 °C to +85 °C. It may be installed at altitudes up to 4000 m. 15 VDC to 36 VDC are required as supply voltage. After power up the device checks the internal acceleration sensors and the relay during the self-test. Once the device is ready for operation, the status is sent to the installation control system via the CANopen interface. The continuous self-test function ensures both acceleration sensors are tested during operation. A defective sensor is signaled via the network.

The sensor may be permanently wired in series with other monitoring devices in the safety chain. If a monitoring device triggers, the safety chain is interrupted and, if necessary, emergency braking initiated. On reaching the limit set, the safety relay in the tower oscillation monitor can be switched and the safety chain opened. In parallel the critical state is signaled to the installation control system via the network. In this way dangerous, superimposed resonances are detected and the installation shuts down. By using several tower oscillation monitors in the safety chain, different safety concepts can be realized. On-shore usage of two devices provides redundancy by means of cross-comparison. Off-shore usage of three devices ensures safe operation also in case of a device failure.

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Lenord + Bauer


Trafag  DIS - Dewit Industrial Sensors