4. 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 and ground lines of the dc power cable to the terminals
marked POS RTN and GND on the dc power source, as shown in Figure 42.
For maximum protection against power loss, connect each of the two dc power
supplies to a different power source.
2
3
1
4
5
exp81034
Figure
42.
The
dc
wiring
from
EXP810
to
disconnect
device
and
dc
power
source
Table
30.
The
dc
power
source
wiring
descriptions
Number
Description
1
Pin 1: -48 V DC
2
Pin 2: POS RTN
3
Pin 3: GND
4
dc power source
5
Disconnect device
5. Continue with “Powering on the EXP810” on page 69 for the initial startup of the
storage expansion enclosure.
66
IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide
Summary of Contents for DS4000 EXP810
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Page 67: ...ds470067 Figure 20 Installing a bezel Chapter 2 Installing the EXP810 39...
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