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BX400 S1 Operating Manual 119
Hot-plug components
8.4 Hot-plug power supply units
The BX400 S1 system unit has 4 bays for hot-plug power supply units (PSU
1-4). The power supply units adapt automatically to any voltage within the range
100 V - 127 V / 200 V - 240 V.
All bays for power supply units are fitted with flaps which close automatically.
This ensures sufficient cooling of the system components when you replace a
power supply unit or fan module during operation.
The PSU bays must be fitted according to their numbering. Unoccupied PSU
bays must be fitted with fan modules to ensure that the system components are
properly cooled, see "Hot-plug fan modules" on page 123.
Figure 42: Numbering of the power supply unit bays
In the minimum configuration, the BX400 S1 system unit contains one hot swap
power supply unit (PSU1). This enables a fully populated BX400 S1 system unit
to run in low power mode. Full power mode requires at least two PSUs in 200
V environments or three PSUs in 100 V environments.
To provide a redundant power supply, a third or fourth power supply unit can be
installed (PSU3 and PSU4) in 200 V environments. In 100 V environments a
fourth power supply unit (PSU4) is required to provide a redundant power
supply. If one of the four power supply units fails, the other two/three units will
ensure the system unit continues to operate normally. The defective power
supply unit can be replaced while the system unit is still running (hot swap).
PSU 1 PSU 2 PSU 3 PSU 4