Service manual

System Overview 1-101
Figure 1–46 shows the H7505 power supply subrack. It is placed in the power
cabinet of GS160/320 systems. Power supplies slide into the rack from the front
of the system. The H7505 uses 1600W power supplies.
Loads must be properly distributed across the three phases to avoid nuisance
tripping of circuit breakers. Therefore, placement of the third, redundant power
supply is important. Figure 1–46 provides a chart showing the recommended
placement.
Two power supplies are needed to power one system box, the H-switch, OCP,
and blower. The third power supply is redundant. When three power supplies
are in a subrack, one may be hot swapped.
The power distribution panel on the subrack routes power from the power
supplies off through the power harnesses to various parts of the system.
Figure 1–46 shows the location of a fuse protecting the system cabinet blower.
A spare fuse is provided and its location is also noted.