UPS/PDU

Technical Requirements -

Computer Room

should plan to utilize their existing UPS and PDU if they are serviceable and

adequate for the load.

Should new or replacement units be required, the following list of desirable

attributes or better should be specified to provide the protection and versatility that

VBA computer room systems require:

The UPS shall be sized based on the equipment requirements of the Regional

Office and future anticipated growth. The attached load should not be less than

30% of the UPS capacity and not more than 70% capacity for the initial sizing.

Less than 30% results in significantly decreased efficiency and greater than

70% allows little room for future growth. In general, 50% - 70% load should be

the goal on sizing the UPS.

Battery systems should be sized to allow for 20 minutes of battery backup or

more at full rated output.

Input filter

Input isolation transformer (may be combined with input filter and step-down

Preferably 480V input / 120/208V output 3 phase delta / wye, 4 wire. 120/208V

input & output acceptable dependent on pricing.

Full, "on-line" solid state conversion (rectifier/inverter)

IGBT technology preferred. SCR technology is acceptable

Static bypass / automatic transfer to bypass on failure, overload or battery end of

life.

Monitor / alarm panel with power parameters, alarms, alarm history (discharge

record and battery monitor desirable)

Maintenance Bypass Switch / circuit - Internal (by UPS manufacturer) or external

(by electrical contractor or VA/GSA electricians) This feature allows continued

operation on utility power when unit is down for service.

Minimum 1 year parts and labor on complete system plus battery manufacturers

warranty to be provided to VA IRM.

Electrical Power Off (EPO) capability to interface with EPO pushbuttons at exit

doors and smoke detection system / pre-action sprinkler system (if installed).

Include shipping, placement and startup in quote from UPS vendor.

Electrical power to UPS by electrical contractor, GSA or VA.

Electrical wiring to PDU and from PDU to receptacles by electrical contractor,

GSA or VA.

The UPS shall have dry contacts available for external alarm and control and

specifically have at least one form "c" contact to signal computer equipment that

the UPS is on battery.

Server shutdown software and hardware/cable connectivity should be provided.

Page 4-6

VBA Design Guide