The BEMF Motor sensing Interlock is designed to control access to rotating machinery. The unit relies on the measurement of the electromotive force generated by the windings of an electric motor. Only when the motor has stopped will the BEMF drop to zero and allow the release of a Castell key. The unit is based around two identical isolated channels that conform to EN954 Category 2 safety requirements.
Designer Systems developed the device hardware and firmware which includes the following features: