Frequency monitoring relay UH 6937

phase sequence2 NODC

With the speed and frequency monitor UH 6937 from the SAFEMASTER S Series, DOLD offers an efficient, economic solution for safe, sensorless drive monitoring. Monitoring the output frequency of traction converters is just one of the many different ways to use this component. In case of over- or underfrequency, violation of the set window range or wrong direction of rotation the frequency monitor shuts off safely, proving its benefit over frequency converters with integrated safety functions in any application where simplicity, flexibility, and safety are required. As an additional protective measure, the device can be adapted to an application by pressing just a few buttons. With the appropriate wiring, the device can offer the safety functions STO (safe torque off), SOS (safe operation stop), SLS (safely limited speed), SSM (safe speed monitoring), SSR (safe speed range) and SDI (safe direction) in accordance with EN 61800-5-2. Advantages and customer benefits - Direction of rotation monitoring up to PL d / Cat. 2 or SIL 2 while retaining PL e / Cat. 4 or SIL 3 for frequency monitoring - Simple, time-saving start-up without a PC - Sensorless and easy to upgrade - Comprehensive diagnostic function - Bypass option for frequency monitoring (Muting) - Up to 4 operating modes can be activated (e.g. automatic, set-up, or service mode) - Monitoring of over-, underfrequency, window range and direction of rotation - For frequencies up to 1200 Hz and voltages up to AC 690 V