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BX900 S1 Operating Manual 53
Installing the hardware
● Always connect the cable first to the power supply unit and then to the
mains.
Ê First connect the insulated C19 connector of the power cable to the power
supply units of the system unit, and then plug the connector into the UPS,
power distribution unit or an external socket.
AC source (phase) redundancy
Make sure that the individual power supply units 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 power
supply units connected to the other AC sources (phases) remain operational.
Figure 9: Numbering of the power supply unit bays
Power system with 2 AC sources (phases) available
With 6 power supply units, 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). Thus 3+3
redundancy is supported; the system continues to run if one source fails,
provided the remaining 3 power supplies are sufficient to deliver the
required power.
PSU 1 PSU 2 PSU 3
PSU 4 PSU 5 PSU 6