Specifications

QSSC-S4R Technical Product Specification System Chassis and Sub-Assemblies

Figure 36. Power Supply Unit (PSU)

10.2.1 Power Supply Modules

The output rating of each power supply is 850 watts when operated between 200 VAC and 240 VAC. Modules are

current-sharing and have auto-ranging input. Each power supply is 7.75 inches wide, 14.5 inches deep, and 1.47

inches high. The power supply modules have universal AC input with Power Factor Correction (PFC) Distributed Power

Supplies (DPS). The AC input receptacle is an IEC-320 C14 15A rated for a 250 VAC minimum.

The power supply operates over the range and limits shown in the following table.

Table 32. AC Input Rating

Parameter Minimum Nominal Maximum Start Up VAC Power Off VAC

Voltage (115) 90 Vrms 100-127 Vrms 140 Vrms 85 VAC +/-4

VAC

75 VAC +/-5 VAC

Voltage (220) 180 Vrms 200-240 Vrms 264 Vrms

Frequency 47 Hz 50/60 63 Hz

When input power is applied to the power supply, any initial current surge or spike of 10 ms or less should not exceed

55A. Any additional inrush current surges or spikes in the form of AC cycles or multiple AC cycles greater than 10 ms,

and less than 150 ms, must not exceed 25A.

The power supply has DC outputs of 12 V and 3.3 VSB. The 12 V main power is distributed through the server and is

converted locally at the point-of-load using embedded Voltage Regulator Module (VRM) converters. The power supply

is capable of power-safe monitoring.

The DC output voltages remain within the ranges shown in the following table when operating at steady state and

dynamic loading conditions. These limits include the peak-peak ripple/noise.

Table 33. 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 34. 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.