52
Upgrade and Maintenance Manual
BX900
S2
Basic hardware procedures
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4.5
Switching on the system unit
V
CAUTION!
Follow the safety instructions in
chapter "Important information" on
page 29
.
Ê
Connect all peripheral cables to the connection blades of the system unit.
Ê
Connect and secure the power cords as described in section
"Connecting
the system unit to the mains" on page 50
.
Ê
Connect all power cords to the power outlets.
I
Make sure that the individual PSUs are connected to different AC
sources (phases). This ensures additional AC source (phase)
redundancy for high-availability configurations. If only one AC source
(phase) fails, the PSUs connected to the other AC sources (phases)
remain operational.
Figure 5: Numbering of the PSU bays
Power system with 2 AC sources (phases) available
With 6 PSUs, you must connect the ones in the top row (PSUs
1, 2 and 3) to the first source (phase) and the ones in the
bottom row (PSUs 4, 5 and 6) to the second source (phase).
PSU 1
PSU 2
PSU 3
PSU 4
PSU 5
PSU 6