The rotation control module AUE 400 detects speed using a shaft encoder, wheel encoder, or proximity sensor. It has three available speed ranges from 1-10 RPM, 1-100 RPM, and 1-1000 RPM that are selected via connection to the bornier. Under normal operation the output contact is powered, but it will fall if the speed drops below the specified threshold. A 10 second start-up delay is also available. Options include various encoders and sensors for different environments.