QuickSpecs

Operating and
Performance
Specifications for Facility
DC
Voltage Nominalinput voltage -48 VDC
Operating voltage range -48VDC ± 10% or -43.2 VDC to -52.8 VDC
Max input voltage slew rate 0.5V/uS
Redundant feed voltages* *A and B feeds must differ by no more than 5VDC
during steady state operation
Ripple/Noise 480 mV PARD**
Overshoot Must remain within regulation limits on all feeds during
startup or shutdown
Voltage Transients Must not exceed -60 VDC
Current Max steady state input current 62.5A per server blade enclosure installed at -48VDC
Max steady state current per
feed/total
Power bus boxes 70 A/70A
Mini bus bars 210 A/210A
Scalable bus bars 210 A/350A or equivalent of 175A per feed*
In-rush current Must support up to 2X the maximum operating current per server blade enclosure (125
A) for up to 1.0 mS
Input over-current Customer provided fusing for facility DC feeds that protects the system from
catastrophic over-current within 20 uS. Fuse should sustain all in-rush and operating
currents.
Max Input Current Slew
Rate
1A/uS
Max Input Curent Slew
Rate
3000W per server blade enclosure
Connection and Cables HP provided facility DC cable connection kit:
The facility DC connection kit supports the connection of up to four -48VDC,
RETURN pairs and ground.
The power cable assemblies consist of 1/0AWG, color-coded, flexible cable rated at
105° C, terminated with bus mating connectors at one end and unterminated at the
other end. The cable length provided enables the customer to route to a fuse panel
within or adjacent to the rack.
NOTE: *All systems support redundant A and B feeds. Scalable bus bars support dual A and dual B feeds.
** Periodic and random noise (PARD). Maximum allowable peak-to-peak ripple and noise (as measured at the load on
any output channel). The ripple and noise is measured over a 20 Hz to 100 MHz frequency band. A resistive load
(non-electronic) is used for this measurement. Each output is by-passed to return by a 10uF tantalum capacitor with
an ESR less than 100 milli-Ohms in parallel with a 0.47 uF ceramic capacitor, at the point of load. The load cable is 12
feet of twisted wire capable of carrying the current. The printed wiring board assembly is installed in its enclosure
for this measurement, or the measurement leads are properly shielded with Earth grounds applied to the insert.
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The information contained herein is subject to change without notice.
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contained herein.
QuickSpecs
HP ProLiant BL20p p-Class Server Blade
Technical Specifications
DA - 11411 Worldwide — Version 24 — September 24, 2004 Page 32