Fujitsu BX900 S1 Manuale Utente

BX900 S1

Operating Manual

53

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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.

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.

P

S

U 1

P

S

U 2

P

S

U 

3

P

S

U 4

P

S

U 5

P

S

U 6