IBM DS3500, Installation, User'S, And Maintenance Manual

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3. Connect the dc power cable to the power supply. See Figure 3-58 for the dc power supply connector
PIN positions.
Table 3-3. DC power supply connector - pin descriptions
Number Function DC power cable wire color
1 Pin 1: - 48 V dc Brown
2 Pin 2: POS RTN Blue
3 Pin 3: GND Green/yellow
4. Connect the - 48V wire (brown) of the dc power cable to an approved disconnect device (circuit
breaker) rated at 20 A. The disconnect device must be easily accessible from the back of the DS3500
unit.
Attention:
v
The disconnect device (circuit breaker) must be rated at 20 A.
v
Make sure that at least 12 AWG or larger copper conductor wires are used for all of the wiring
between the DS3500 or EXP3500 dc power connectors and the dc power source.
5.
Complete the wiring from the disconnect device to the terminal marked -48V of the Reliably
grounded safety extra low voltage (SELV) dc power source. Connect the POS RTN wire (blue) and the
ground wire (green/yellow) of the dc power cable to the terminals marked POS RTN and GND on
the dc power source, as shown in Figure 3-59.
Table 3-4. DC power source wiring descriptions
Number Description
1 Pin 1: - 48 V dc
2 Pin 2: POS RTN
3 Pin 3: GND
Figure 3-58. DC power connector - pin positions
Figure 3-59. DC wiring from DS3500 to disconnect device and dc power source
3-48
System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide