In case of multiple failures, one or both of the main circuit breakers will trip, shutting down several units in the system system if not the entire system. Note The grey DC fuse panels have input circuit breakers and the black do not. If a fault condition occurs, remove all power by first turning off the 4 DC fuse panel circuit breakers, then turning off the main power circuit breakers. When equipment installed in an system system rack fails because of overheating or power loss, try operating the equipment by itself. Step 2 Replace any defective fuse with a fuse of the correct rating.
Warning Never change fuses with live power present.
Lethal currents are present on and in the DC fuse panels. Caution Never use a larger fuse than what is specified for the individual locations. Refer to Table 3-1 for the correct fuse size for each location. Step 3 Follow the power-on sequence of operations. Step 4 Verify that the proper LED power on indications are present and that airflow has resumed.