Stratus ftserver 3300, Site Planning Manual

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Using PDUs
7-4 Stratus ftServer 3300, 5600, and 6600: Site Planning Guide (R553)
Sample Power Usage Calculation
Table 7-3 illustrates a calculation for an A-side PDU that is plugged into a
NEMA L6-20R receptacle in the United States, with a power voltage of 208V.
In this calculation, components were added one by one, calculating the total current
demanded by the components and comparing them to 15A, which is the recommended
maximum current to draw from the A-side PDU. The A-side PDU can support four
ftServer 3300 systems, three D540 storage enclosures, the V128 1U LCD unit, and the
KVM switch. Adding the fourth D540 storage enclosure trips the 15A limit and would
require a second pair of PDUs.
A similar calculation for ftServer 5600 systems determines that the one pair of PDUs
can support two ftServer 5600 systems, two D540 storage enclosure, the V128 1U
LCD unit, and the KVM switch.
Table 7-3. Sample Power Usage Calculation for an A-Side PDU
1. Component 2. Watts
Subtotals
3. Watts 4. Wattage
÷
Voltage
ftServer 3300 system 500 W 500 W 2.40 A
D540 storage enclosure 300 W 800 W 3.85 A
V128 1U LCD units 21 W 821 W 3.95 A
KVM switch 20 W 841 W 4.04 A
ftServer 3300 system 500 W 1341 W 6.45 A
D540 storage enclosure 300 W 1641 W 7.89 A
ftServer 3300 system 500 W 2141 W 10.29 A
D540 storage enclosure 300 W 2441 W 11.74 A
ftServer 3300 system 500 W 2941 W 14.14 A
D540 storage enclosure 300 W 3241 W 15.58 A