Caroline County, Virginia Request for Proposals Project 25 Radio ...

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UHF/700 MHz P25 Radio Communications SystemRequestion for ProposalsCaroline County, Virginiah. When the fault has cleared, the static bypass transfer switch returnsthe load to the UPS system.i. If the battery is disconnected, the UPS continues to supply power tothe load with no degradation of its regulation of voltage andfrequency of the output bus.2. Manual operation includes the following:a. Turning the inverter off causes the static bypass transfer switch totransfer the load directly to the normal AC supply circuit withoutdisturbance or interruption.b. Turning the inverter on causes the static bypass transfer switch totransfer the load to the inverter.3. Controls and Indications:a. Basic system controls shall be accessible on a common controlpanel on the front of the UPS enclosure.E. Performance Requirements:1. Input:2. Output:6.5.2 DC Powera. Single phase, three-wireb. Voltage: 120/240V Nominalc. Frequency: 50/60 Hz +/- 3 Hza. Capacity: to be determined by SELECTED VENDOR duringpreliminary designb. Voltage: 120/240Vc. Frequency: 60 Hz, +/- 3 Hzd. Maximum Voltage Distortion: 5% at full loadA. The SELECTED VENDOR shall perform electrical loading analysis for shelterequipment, excluding HVAC subsystems, during preliminary design to verify DCpower plant size required and battery count. All electrical loading calculationsMay 27, 2011 Page 67 of 134
UHF/700 MHz P25 Radio Communications SystemRequestion for ProposalsCaroline County, Virginiashall include a 25% expansion factor, and all assumptions regarding powerconsumption and duty factor shall be thoroughly explained.B. Controls and Indications:1. Basic system controls shall be accessible on a common control panel onthe front of the DC Power supply/rectifier. The following shall be displayedat a minimum:a. Battery float voltageb. Battery voltage temperaturec. Battery charge currentd. DC output voltagee. Form-C relay outputs shall be available for alarm conditions. Thefollowing alarms shall be available at a minimum:1) Overvoltage2) Under voltage3) Battery over temperature4) Fuse/CB trip5) Rectifier fail6) AC FailC. Performance Requirements:1. Input:2. Output:a. Single phase, three-wireb. Individual rectifier feedsc. Voltage: 120/240V Nominald. Frequency: 60 Hza. Capacity: to be determined by SELECTED VENDOR duringpreliminary design.May 27, 2011 Page 68 of 134
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Caroline County, Virginia Request for Proposals Project 25 Radio ...

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