User`s guide

8 NovaScale 4020 User’s Guide
Power Supply Bay
The power supply bay, shown below, is located in the lower front of the system. Redundant
power status LED indicators are in the left portion of the power bay and three hot-swap power
supply modules dock into the three bays on the right.
TP0029
5
ACR AC2 AC1
PS + SHARED AC2/PS2 AC1/PS1
B
A
A. Power status LEDs
B. Power supply modules
Figure 8. Power Supply Bay
The power subsystem can be configured as follows:
• Three power supply modules installed, (2+1) redundancy
• Two power supply modules installed, non-redundant
NOTE
The power supply modules must be populated from right to left. The left
power supply module is optional in a non-redundant configuration. If no
module is installed in the left slot, a filler panel is required for proper
system cooling.
Two power supply modules are capable of handling the worst-case power requirements for a
fully configured server system. This includes two Intel Itanium 2 processors, 16 GB of
memory, three PCI add-in cards, two hard drives, and a DVD-ROM / CD-ROM drive.
When the system is configured with three power supply modules, the hot-swap feature allows
you to replace a failed power supply module while the system is running.
The power subsystem receives AC power through two power cords. When three power supply
modules and two power cords are installed, the system supports (1+1) power cord redundancy.
This feature allows the system to be powered by two separate AC sources. In this
configuration, the system will continue to function without interruption if one of the AC sources
fails.