Cisco IE-3000-4TC Installation Guide - Page 130
B-30, Completed Connections for Two External Alarm Devices on the Power and Relay, Connector
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Connecting Power and Alarm Circuits Appendix B Installation In a Hazardous Environment Figure B-30 shows the completed wiring for two power supplies and two external alarm devices. Figure B-30 Completed Connections for Two External Alarm Devices on the Power and Relay Connector 1 2 3 4 V RT A A 5 6 7 8 V RT A A 201820 1 Power source A positive connection 5 Power source B positive connection 2 Power source A return connection 6 Power source B return connection 3 External device 1, relay wire major alarm 7 External device 2, relay wire minor alarm connection connection 4 External device 1, relay wire major alarm 8 External device 2, relay wire minor alarm connection connection If your power source is -48 VDC, this table descibes the wiring connections for Figure B-30. 1 Power source A return connection 2 Power source A -48 VDC connection 3 External device 1, relay wire major alarm connection 4 External device 1, relay wire major alarm connection 5 Power source B return connection 6 Power source B -48 VDC connection 7 External device 2, relay wire minor alarm connection 8 External device 2, relay wire minor alarm connection See the "Attach the Power and Relay Connector to the Switch" section on page B-24 for instructions on how to connect the power and relay connector to the front panel. B-40 Cisco IE 3000 Switch Hardware Installation Guide OL-13017-01