CIRCUIT ARRANGEMENT OF A SWITCHGEAR TESTER FOR CALL SEQUENCING UNIT IN A CROSSBAR SWITCH TYPE TELEPHONE EXCHANGE

摘要

Circuit arrangement of a tester of switching units of the calls sequence set in crossbar switch type exchanges, particularly designed for use in mines, in which the contacts of self-sustaining of buffer relays are included in the circuit of the positive end of the exchange battery, characterized in that it has at least ten intermediary relays (1A,.. ., 10A), whose moving contacts (12) of the normally closed contact sets (1a,..., 10a), are connected, via at least ten toggle switches (P1,..., P10) with the positive end of the exchange battery, and the fixed contacts (13) of the contact sets (1a,..., 10a) are connected to the inputs of at least ten sets of relays (1R,..., 5R) included in the calls sequence set (ZK), whereas in the circuits of the fixed contacts (11) of the contact sets (1a,..., 10a), signalling lamps (L1,..., L10) are included, whose other sides are connected to the negative end of the exchange battery, whereas in the circuit of the positive end of the exchange battery a two-position connector (£) is included, whose one group of contact sets (1, 2, 3) is connected to moving contacts (21), connected in series, of operating contacts (1a',..., 10a') of self-sustaining of the relays (1A,..., 10A), whereas the second group of contact sets (4, 5, 6) is connected to the output of the voltage coil of the relay (W) of the calls sequence set (ZK), and the outputs of the circuit arrangement are connected to a multi-conductor cable ended with a multi-contact plug, in which there are bridge connections between selected contacts.IMAGE