NRG Product Manual
Hybrid XT Anemometer
HybridXT_Anemometer_Manual
Rev. 15
[email protected] | Page 9
02 January 2020
ESD and Circuit Protection
The HXT sensor has been designed to withstand most common wiring errors and electrostatic discharge.
These include reversed polarity on the power supply inputs, applying power to or shorting the signal
output lines, and electrostatic discharge on any line.
However, the sensor is not indestructible. Avoid applying more than the rated power supply to any pin.
While extremely rugged, nearby or direct lightning strikes may damage the sensor.
Cable Shielding - Important
The user must decide how to connect the shield of the signal cabling for their application. This is an
important part of the overall design of the lightning protection and grounding system for each turbine
design.
We recommend that the shield always be connected at the controller end of the cable. This provides
shielding against capacitively (electrostatically) coupled interference to the sensor signal.
If the shield can be connected to ground at the sensor boom as well, the shield can also provide
protection against inductive (magnetically) coupled noise sources, such as generator noise and lightning
electromagnetic pulses. However, you should connect the shield at both ends ONLY if the turbine
grounding system provides sufficient bonding and grounding to prevent ground loop currents in the
shield wire.
On the cable assembly for the HXT sensor, the shield is available for connection at both ends. If the
sensor end is not to be connected, cut off the shield wire at the sensor end before installation to
prevent accidental contact to the sensor mount.
