Community College of Allegheny County OCS Security Camera System Pittsburgh, PA
milliseconds and shall be a double-pole device. The bypass circuit shall be designed to ensure the simultaneous transfer of the L1 and L2 poles. The bypass shall be configured to wrap around the PFC converter, battery charger, DC-DC converter, inverter and battery. The bypass circuit shall use the rear-panel mounted UPS input circuit breaker and route bypass power through the UPS input filters and surge suppression circuit. The bypass circuit default position shall be in the Bypass mode (utility). B. Automatic Transfers: The transfer control logic shall activate the bypass automatically, transferring the critical AC load to the bypass source, after the transfer logic senses one of the following conditions: 1. UPS overload 2. UPS over temperature 3. PFC failure 4. Inverter failure 5. DC bus overvoltage C. Once the overload condition is reduced, the load shall be automatically transferred back to inverter power. An over temperature requires manual transfer back to inverter power after cooling.
2.4
INTERNAL BATTERY
A. Valve-regulated, non-spillable, lead acid cells (VRLA) shall be used as a stored-energy source for the specified UPS system. The internal battery shall be user replaceable and includes a blind-mate style connector located on the rear of the battery kit. The battery shall be housed internal to the UPS cabinet and sized to support the inverter at rated load and power factor, with ambient temperature of 25°C (77°F) for a minimum of 3 minutes reserve time. The expected life of the battery shall be 3-5 years or a minimum 260 complete discharge cycles. The UPS units have the capability to allow the operator to replace the internal battery.
2.5
OPTIONAL EXTERNAL BATTERY CABINET
A. All UPS models shall allow connection of up to six external battery cabinets to provide extended run time capabilities. External battery cabinets shall match the UPS in aesthetics and color.
2.6
OUTPUT DISTRIBUTION
A. Output distribution shall be hardwire input/output as standard. Optional output distribution shall be available to the UPS cabinet and located on the rear of the unit. The optional distribution options shall be available with break-before-make maintenance bypass switch to allow for complete shutdown and isolation of the UPS for service without powering down the connected loads. Output distribution configurations shall be:
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