Product guide

QSSC-S4R Server System Product Guide Chapter 1: System Description

Version 1.0

Table 10. DC Output Voltage Regulation Limits

Parameter Tolerance Minimum Nominal Maximum UNITS

+12V -5%/+5% +11.40 +12.00 +12.60 VDC

+3.3Vstandby -3%/+5% +3.20 +3.30 +3.46 VDC

The combined continuous output power for all outputs does not exceed 850W. Each output has the maximum

and minimum current rating shown in the following table.

Table 11. 850W Power Supply Load Ratings

Output Level Minimum* Nominal* Maximum* Peak*

+12V 0A 69A 88A

+3.3V standby 0A 6.0A

*Note: Values are at the system level. For 2+2/or 3+1 redundant systems, the load each power supply provides

is based on its current sharing accuracy.

Figure 7. Power Supply Indicators

Note: The cooling system is non-redundant if only two power supplies are installed in the Value SKU.

Caution Power supplies must be hot swapped within three minutes to prevent overheating. This time period

applies only to the time that the power supply is physically removed, not from the time of failure.

Table 12. Power supply indicators

LED LED Name Symbol Color/LED State Description

A DC Power

Redundancy status

Green – Blinking Cold Redundancy Mode

Green - On PSU on and running

B Power Supply Failures

and Warnings

Amber – Blinking PSU warning event operation continuing

Amber – On PSU critical even shutdown

C AC Power Supply

Input Status

Green – Blinking AC power not present

Green – On AC power present

Cooling Subsystem

Caution The chassis top cover must be installed for proper system cooling. Cooling components must be hot

swapped with three (3) minutes. This time period applies only to the time that the cooling

component is physically removed, not from the time of failure.

The QSSC-S4R Server system contains two cooling fan zones comprising a total of eight system fans located at

the upper front of the system and two dual-motor fans located within each power supply module. The basic

chassis structure is divided into a lower section of 1U height and upper section of 3U height.

The upper section is cooled with up to eight 80 mm fans positioned in front of the system exhausting into the

memory, CPU, and PCIe regions. The lower section is cooled by fans located within the PSUs drawing air

through the hard drives and across the power distribution board.