Community College of Allegheny County OCS Security Camera System Pittsburgh, PA
2. Battery - Upon failure of utility / mains AC power, the critical AC load shall be supplied by the inverter, which obtains power from the battery. There shall be no interruption in power to the critical load upon failure or restoration of the utility / mains AC source. 3. Recharge - Upon restoration of utility / mains AC power, after a utility / mains AC power outage, the input converter shall automatically restart and resume supplying power to the inverter and the battery charger begins to recharge the battery. 4. Automatic Restart - Upon restoration of utility / mains AC power, after a utility / mains AC power outage and complete battery discharge, the UPS shall automatically restart and resume supplying power to the critical load and the battery charger automatically recharges the battery. This feature shall be capable of being disabled by the user. 5. Bypass - The integral bypass shall perform an automatic transfer of the critical AC load from the inverter to the bypass source, in the event of an overload, PFC failure, internal over temperature, DC bus overvoltage or inverter failure conditions. 6. ECO – The UPS shall allow the user to enable and place the UPS in ECO mode of operation to reduce electrical consumption. The ECO mode operation shall be an Active type, whereas the UPS will power the connected equipment through the bypass path and the UPS inverter shall be on and operating at no load in order to stay synchronized to the bypass to ensure rapid transfers to inverter power when input power falls outside of the user customizable parameters. The UPS shall also have a user customizable requalification time that input power must remain within the ECO mode parameters before transferring back to ECO operation. This is to minimize the number of transfers between bypass and inverter. Voltage shall operate at either 120/208V or 120/240V by sensing the utility phase angle and configuring the dual inverters to the same angle: 120 or 240 degrees (or) 180 degrees. Nominal input/output voltage specifications of the UPS at rated load shall be: a. Input: The UPS shall be able to operate from 120/208V, 50/60Hz (or) 120/ 240V, 50/60Hz without the use of selector switches or voltage taps. Input wiring must be 3- wire plus ground (L1, L2, N, G, with N solid bonded to G at the distribution panel). b. Output: Output voltage shall be present at terminals L1, L2 and N. The output voltage shall be 120/208V, 50/60Hz. Voltage measured between L1-N and L2-N: 120VAC ±3%, 50/60Hz; L1-L2: 208VAC ±5%, 50/60Hz. The UPS shall be configurable using the included configuration program to provide the following alternate output voltages: 1) 120/240V, 127/220V, 115/230V, 110/220V, 100/200V, all voltages 50 or 60Hz. c. If the UPS is started on battery with no input power present, the default output voltage shall be 120/208V, 60Hz from the factory. After the UPS has been started from utility, the output voltage/frequency shall match the last known input voltage/frequency that was applied. Design Requirements 1.
B.
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