Hardware manual

TITAN SILICONSERVER HARDWARE MANUAL 23
Power Supply Unit (PSU) 600
Power
The Titan SiliconServer monitors the operational status of the power supply modules
so that the management interfaces can indicate the physical location of the failed
unit. However, it is not possible to distinguish between failed components within a
PSU module (such as built in fans).
Titan has dual, hot-swappable, load sharing, AC power supplies. The power supplies
are serviced and accessible from the rear of the Titan SiliconServer.
Mains power connections are an IEC inlet in each power supply. Each PSU is only
powered from its mains inlet. Two power feeds are required for the system. Each PSU
has an on/off switch to turn on and off the unit without removing the power cabling.
The power connections also have a retaining clip which prevents accidental removal
of the cable.
Each power supply auto-ranges over an input range of 90V to 240V AC, 50Hz to 60Hz.
Battery
Each power supply includes a battery unit that is part of Titan’s stable storage solution. The batteries
within each PSU module operate in both a redundant and parallel manner.
Both batteries must be present and charged to support the full NVRAM backup period, but either
battery on its own can backup the NVRAM for a shorter period of time. A fully-charged, dual battery
system should keep the server’s NVRAM alive for about 72 hours. Charging time will be at a rate of 8
hours of backup for every hour of charging time, or approximately nine hours for a complete charge.
PSU and Battery Care
Each PSU contains a battery used for NVRAM. To maximize the performance of the battery, it is
necessary to fully charge the battery.
Complete battery discharge can happen if the server is not shutdown correctly, in which case the
NVRAM LED will indicate that the NVRAM is still powered. Verify that the server has been shutdown
correctly before powering off. If a proper shutdown was not possible and NVRAM does not need to be
preserved, then removal of both PSU modules at the same time, for a few seconds, will ensure that the
NVRAM enters the OFF state and the batteries no longer supply power to the NVRAM.
When preparing a Titan SiliconServer for shipment or if it is powered down for any length of time, it is
important that the server has been shutdown correctly before powering-off. Otherwise, if the server is
improperly shutdown, the batteries supplying the NVRAM will become fully discharged. This also occurs
if the server is powered down for too long without following the proper procedure.
Table 10: PSU Status (Green/Amber)
Status Meaning
Green Mains, DC, and battery are okay
Amber PSU Failure (including internal fans or battery)
Off No mains connections or switched off