Safety circuit for separate or coupled electrical drives such as printing units - has relay circuits with coupled control lines that connect to switching circuitry

摘要

An interlock circuit provides safe operation of a pair of electrical units, such as the printing stages of rotary print machines. The units may selectively be operated as separate units or in a coupled mode. The same circuit is used for each drive and has a control line (3) coupled to the contact (1k4.1) of a coupling relay (1k4). The control lines of the two circuits are connected together. The circuits have safety stages (1) that consist of the contacts (151.1,151.2,151.3) of a coupling switch (151). ADVANTAGE - Provides safe operation for two separate or coupled units.