HP ProLiant BladeSystem p-Class System Maintenance and Service Guide

Specifications 119
Table 5-13 Operating and Performance Specifications for Facility DC
Specifications Value
Redundant feed voltages * Bus A and bus B voltages must differ by no more than 5 VDC
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 62.5 A per server blade enclosure installed at -48 VDC
Max steady state current per feed/total
Power bus boxes 70 A/70 A
Mini bus bars 210 A/210 A
Scalable bus bars 210 A/350 A or equivalent of 175 A 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 must provide fusing for facility DC feeds that protect
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 rated power 3,000 W per server blade enclosure
Connections and cables HP provided cable option kit:
The facility DC connection kit supports the connection of up to
four -48 VDC, RETURN pairs and ground.
The power cable assemblies consist of 1/0 AWG, color-
coded, flexible cable rated at 105°C (221°F), terminated with
bus mating connectors at one end and not terminated at the
other end. The cable length provided enables the customer to
route to a fuse panel within or adjacent to the rack.
*All systems support redundant power configurations by using separate power inputs for each bus. Scalable bus bars provide
dual power inputs (P1 and P2) for each bus.
**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 10-uF 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.