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
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