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CiA 301

CANopen sensor with Mems accelerometer

The XY CANopen sensor from Gram & Juhl is suitable for monitoring tower sway with its internal two-axial Mems accelerometer. Instead of an EIA-485 serial bus, the sensor communicates via CANopen.

(Photo: Gram & Juhl)

THE XY CANOPEN SENSOR COMES WITH BUILT-IN digital signal analysis that has advanced motion monitoring capabilities at low system costs, says the Danish company. Applications include monitoring structures such as wind turbines, bridges, communication masts, towers, cranes, and buildings. Since the sensor is a self-contained digital device, there is no risk of damaging an external sensor. In addition, cabling is straightforward. This makes the sensor reliable for critical systems. The sensor is suitable for tower sway monitoring due to its ability to measure low frequencies simultaneously in X and Y directions with its internal two-axial Mems accelerometer. The sensor can be used for monitoring the motion of the structure onto which the sensor is mounted. It measures within the range of ±1,6 g in a 0 Hz to 50 Hz frequency band.

Vibration guards

The sensor has four real-time programmable vibration guards. The guards are independently configured regarding direction, frequency band, level, response time, attack time, and decay time. Alarms are signaled via a relay switch. According to the company, the vibration guards are optimized to provide the fastest possible physical response time. Vibration guards, bit-rate, heartbeat, and Node ID can be programmed by Gram & Juhl or with use of their programming kit. The programming kit consists of: a 24-V power supply cable, a CAN-USB adapter for programming settings from the user’s PC, as well as a CANopen software provided on a USB stick.

CANopen operation

The sampling rate of raw continuous data is 99,65625 Hz. Guard levels along with maximum latched guard levels and alarm status are transmitted every 100 ms. Alarms are signaled when any active guard level exceeds one of the preset thresholds, causing the sensor to enter into an alarm state, thus opening its solid-state relay.

The CANopen sensor supports the CANopen standard, supporting device profile CiA 301. Using CANopen, the software is able to provide real-time streaming of raw vibration data, guard levels, and alarm status. An EDS file is available for host programming.

Publish date

Gram & Juhl