Huawei OceanStor 5800 V3 - Pressing the Power Button on the Controller Enclosure; Checking Status Indicators on the Enclosures

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Scenario 2 Connecting a DC power cable
Complete view of the DC power cables
When you connect DC power cables, ensure that the black cable leading from the anode of the DC power
source connects to the RTN (+) terminal and that the blue cable leading from the cathode of the DC power
source connects to the NEG (-) terminal.
Disk enclosure
Controller enclosure
DC PDU