DEVICE ENSURING THE OPERATION SAFETY OF THE LIFT HAVING THE ELECTROMAGNET BRAKE Russian patent published in 1995 - IPC

FIELD: lifting-and-conveying equipment. SUBSTANCE: device has the circuit of connected in series switches for closing the shaft doors and the switch of the cabin doors. This circuit is connected with the circuit of the winding supply of the braking electromagnet. The photothyristor of the optothyristor is switched in the circuit of the winding supply of the braking electromagnet. The emitter of the optothyristor is switched through a resistor in the circuit of switches for closing the doors into which diode is turned on. EFFECT: enhanced reliability of systems controlling lifts having electromagnet brakes of constant current. 1 dwg