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Ramloc Ri For Hydraulic Elevators

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As the elevator stops level with the floor, the Ramloc system (RL) is energised through the door controller DR or other command.

The RL pump driven by motor RM starts simultaneously with the energising of solenoids LC and LO. The Ramloc system pressure builds up to the setting of the pressure switch PS, normally 1.5 times the maximum static pressure of the elevator main cylinder. The Ramloc closes.

As long as the Ramloc pressure is maintained, solenoid LC and pump/motor drive RM remains de-energised. As the Ramloc pressure falls back, the RL pump drive and solenoid LC are briefly energised until the pressure is built back up. Solenoid LO remains energised until the elevator car doors close. Relief valve RS should be adjusted to 20 bars above the setting of the Ramloc pressure switch PS.

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