Service manual

System Overview 1-111
Figure 1–51 shows the H7504 power supply subrack. It is placed between the
drawers and the AC input boxes. Power supplies slide into the rack from the
front of the system. The H7504 power subrack accepts 1000 watt power
supplies.
Two power supplies are needed to power one drawer, the OCP, and clock. The
third power supply is redundant. When there are three power supplies in a
subrack, one may be hot swapped.
There is an electrical difference between the GS80 power subrack and the
GS160/320 subrack.
Figure 1–51 shows the location of a fuse protecting the system cabinet blower.
A spare fuse is provided and its location is also noted.
There are also two variants:
H7504-BA IEC power cord for North America (120V input)
H7504-DA NEMA power cord for Europe/Japan (200-240V inputs)