HP LP 2000r manual Uninterruptible Power Supplies UPS, Power = Vol ts x Amps

HP Netserver High Density Rack Solutions Overview (LP 2000r)

Uninterruptible Power Supplies (UPS)

The Uninterruptible Power Supply (UPS) is used to provide power to servers and peripherals should the AC power fail. Generally, the UPS will maintain an appropriate level of AC voltage and current long enough for the equipment to save open files and shut itself down in an orderly manner.

All UPSs sold by HP for use with the HP Netserver LP 2000r also feature complete surge protection and noise filtering.

Sizing a UPS is easy. However, many people are often confused over the differences between Watts and VA and which rating to use when selecting a UPS.

Power is a measure of energy divided by time. In direct current (DC) environments power is expressed as:

Power = Vol ts x Amps

In alternating current (AC) circuits, however, some of the current may travel into and back out of the equipment. This current is called a harmonic current and creates an apparent power (VA), which is larger than the actual power (W).

For many electrical devices the difference between the apparent power (VA) and the actual power (W) can be ignored. This applies to the HP Netserver LP 2000r. However, some devices without “power factor correction” may have an apparent power (VA) that is up to two times the Watt rating of the device. Normally, the required UPS rating may be determined by the total Watts required. However, if the UPS load consists of a high percentage on non-power factor corrected equipment, the VA rating of the UPS must also be considered to avoid overloading the UPS.

Uninterruptible

Power Supply

These are the UPSs available for the HP Netserver LP 2000r:

Input Voltage	Volts/Amps	Output Receptacles		Input Plug	HP Product Number
		Quantity	Type
120 VAC	2.2 kVA	2	NEMA 5-20	NEMA 5-20P	APC2R120
		6	NEMA 5-15
120 VAC	3.0 kVA	2	NEMA 5-20	NEMA L5-30P	APC3R1201
		1	NEMA L5-20
		4	NEMA 5-15
208 VAC	3.0 kVA	2	NEMA 5-15	NEMA L6-20P	APC3R208
		2	NEMA L6-20
		1	NEMA L6-30
230 VAC	2.2 kVA	1	IEC-19	IEC320	APC2R230
		8	IEC-320
230 VAC	3.0 kVA	1	IEC-19	IEC320	APC3R2302
		8	IEC-320

1For integrated shipment, order HP Product Number APC3RA

2For integrated shipment, order HP Product Number APC31A

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