Electrical diagram of a lifting unit with an asynchronous drive

Abstract

For the proper functioning of the lifting unit, first of all, the correct operation of the main bearing lubrication must be ensured, which is carried out using two oil pumps, one of which is working and the other is a spare. The oil pumps are controlled using the oil pump switch. After the circuit of the coil 1RP is closed, its contact 1RP will close and thereby block the contact KK-0, which is open in the working positions of the command controller, ensuring the closure of the circuit of the coil 1RP until this circuit is broken by the limit switch ZVK, which is opened at the end of the lifting by the corresponding cage. When the circuit of the coil of the relay 1RP is closed, the contact of this relay 1RP, which is in the circuit of the coils of the reversing contactors B and I, will be closed. As a result, the circuit of the coils of the said reversing contactors will be closed at this point.