R1000GZ and R1000GL

Intel
®
Server System R1000GZ/GL Product Family TPS
3.7 DC Power Supply Input Specifications
The following sections provide the DC Input Specifications for systems configured with DC power supply
modules.
NOTE: Product Safety Regulations pertaining to the use of DC power supplies require that chassis grounding
studs be used for all DC power supply configurations. In the event that chassis grounding studs are not
available on a given server chassis, systems must be configured with two DC power supplies, with each
connected to separate ground wires while the system is operational.
3.7.1 DC Input Voltage
The power supply must operate within all specified limits over the following input voltage range.
Table 15. DC Input Rating
PARAMETER
MIN
RATED
MAX
DC Voltage
-40.5 VDC
-48VDC/-60VDC
-75VDC
Input Current
24A
12.5A
3.7.2 DC Input Fuse
The power supply shall have the –48VDC input fused. The fusing shall be acceptable for all safety agency
requirements. DC inrush current shall not cause the fuse to blow under any conditions. No protection circuits
in the power supply shall cause the DC fuse to blow unless a component in the power supply has failed. This
includes DC output load short conditions.
3.7.3 DC Inrush Current
Maximum inrush current from power-on shall be limited to a level below the surge rating of the input line cable;
input diodes, fuse, and EMI filter components. To allow multiple power cycling events and DC line transient
conditions max I²t value shall not exceed 20% of the fuse max rating. Repetitive ON/OFF cycling of the DC
input line voltage should not damage the power supply or cause the input fuse to blow.
3.7.4 DC Input Under Voltage
The power supply shall contain protection circuitry (under-voltage lock-out) such that the application of an input
voltage below the specified minimum specified, shall not cause damage (overstress) to the power supply unit
(due to over-heating or otherwise).
3.7.5 DC Holdup Time and Dropout
Loading
Holdup time
750W (100%)
0.2msec
During a DC dropout of 0.2ms or less the power supply must meet dynamic voltage regulation requirements
for every rated load condition. A DC line dropout of 0.2ms or less shall not cause tripping of control signals or
protection circuits. Repeated every 10 seconds starting at the min input voltage DC line dropout shall not
damage the power supply under any specified load conditions. The PWOK signal shall not go to a low state
under these conditions. DC dropout transients in excess of 0.2 milliseconds may cause shutdown of the PS
Revision 2.2
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