Electro-hydraulic activation arrangement, has timer which interrupts power supply of pump motor if pressure reaches predetermined range

摘要

The arrangement includes a hydraulically activated positioning drive, a pump connected over a pressure conductor with the positioning drive, and a drive motor for driving the pump. A pressure switch (S1,S3) in the pressure conductor is connected with a motor control (6) which includes a timer (16,18;17,19). This interrupts the power supply of the drive motor if the pressure switch produces a signal above a predetermined duration, which indicates the reaching of a predetermined pressure range.