Compaq DA-11411 Operating and Performance Voltage, Specifications for Facility DC, Current

QuickSpecs

ProLiant BL20p and p-Class system

Technical Specifications

Operating and Performance	Voltage	Nominal input voltage		-48 VDC
Specifications for Facility DC		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
		(A & B)		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 Rated Power	3000W per server blade enclosure
	Connections and Cables	Compaq 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.

DA-11411 World Wide — Version 4 — September 19, 2002 25