Is it necessary to observe the alternation of phases when connecting a three-phase USM?
Is it important to connect phase rotation when connecting a three-phase ultrasound transducer? And for some reason, after working on a 0.4 kV high-voltage transmission line, it stopped working, the U (, U) indicators flash in turn, and the coil indicator lights up in red.
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Phase rotation control is one of the functions of the ultrasonic scan, so if some work was done on the line and the circuit changed, this may be one of the reasons for the operation of the ultrasound scan. Check also the voltage levels by phases, as the relay could also operate due to voltage exceeding the limits of the maximum and minimum values, as well as in the presence of a phase imbalance.