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Complete the following steps to connect the dc power supply cable:
1. Using the supplied strap, tie the power supply cord to the rail to provide strain
relief for the power cord.
2. Connect the dc power cable to the power supply. See Figure 94 for the dc
power supply connector PIN positions.
Table 38. DC power supply connector - PIN descriptions
Number Description
1 Pin 1: -48 V dc
2 Pin 2: POS RTN
3 Pin 3: GND
3. Connect the - 48V line of the dc power cable to an approved and rated
disconnect device. The disconnect device must be easily accessible from the
back of the DS4700 Express unit.
5
6
7
4
3
1
2
4
5
6
5
6
ds470093
7
7
8
8
8
Figure 93. DC power supply and fan unit cabling scheme - dual-level redundancy
ds470095
3
2
1
Figure 94. DC power supply connector - PIN positions
114 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide