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The system automatic bypass shall provide a transfer of the critical load from the Inverter output to the automatic bypass input source during times when the inverter cannot support the load. Such times may be due to prolonged or severe overloads, or UPS failure. The UPS constantly monitors the output current, as well as the bypass source voltage, and inhibits potentially unsuccessful transfers to automatic bypass from taking place. B. The design of the automatic bypass switch power path consists of a heavy-duty electromechanical bypass contactor. C. Automatic Transfers: An automatic transfer of load to bypass takes place whenever the load on the critical bus exceeds the overload rating of the UPS. Automatic transfers of the critical load from bypass back to normal operation takes place when the overload condition is removed from the critical bus output of the system. Automatic transfers of load to bypass also take place if for any reason the UPS cannot support the critical bus. D. Manual Transfers: Manually initiated transfers to and from bypass may be initiated through the UPS computer interface (via serial or USB communications) or by engaging the bypass switch on the rear panel of the unit. 2.7 BATTERY A. The UPS battery system is comprised of user replaceable, hot swappable, battery modules. B. The battery jars housed within each removable battery module are of the Valve Regulated Lead Acid (VRLA) type. C. The UPS incorporates the Intelligent Battery Management system to continuously monitor the health of each removable battery module as well as external battery modules installed in extended run battery cabinets. This system shall notify the user in the event that a failed or weak battery module is found. D. Charging: 1. The intelligent battery management system contains a temperature monitoring circuit and compensation algorithm that regulates the battery charging current so as to optimize battery life. 2. The battery charging circuit remains active when in bypass and online states. E. Additional battery modules may be added to increase runtime. These modules are hot- pluggable, allowing for easy and quick installation or replacement without the need for electrical wiring, electrician services or powering down of the UPS. The number of external battery modules that may be connected to the UPS is unlimited. F. The UPS is shipped with battery modules preinstalled but disconnected. 2.8 DISPLAY AND CONTROLS A. Control Logic: The UPS is controlled by an embedded microcontroller which performs functions: 1. Monitoring quality of output voltage; 2. Monitoring vital parameters of the UPS; 3. Executing the state machine; 4. Intelligent battery management; 5. Remaining runtime calculation; 6. Self-diagnostics, self-test and proactive fault detection; 7. Communication to the host server via serial port; 8. Communication to the Network Interface Card or another SmartSlot accessory card if equipped. 9. Etc. B. Display/Control Unit: A display/control comprised of 16 LEDs and 2 pushbutton switches is located on the front side of the UPS. The display/control unit may be turned 90 degrees clockwise or counterclockwise to accommodate for the way the UPS is mounted: as a tower UPS or as a rack-mounted UPS. C. The pushbutton switches located at the Display/Control Unit: The following controls functions can be accomplished by use of the pushbutton switches located at the Display/Control Unit: 1. Turn the UPS on; 2. Turn the UPS off; 3. Initiate self-test in order to test battery condition; 4. Silence audible alarm; 5. Cold start. 6. Displaying input RMS voltage on the battery capacity LED bar graph. D. Bypass switch: On the rear panel of the UPS (models rated 5000VA and higher) there’s a switch that when engaged forces the UPS into bypass state provided the input voltage and frequency are within acceptable limits. E. EPO switch: The UPS is equipped with Emergency Power Off (EPO) terminal which can be wired so as to provide means to instantaneously de-energize the UPS and its load from a remote location in case of emergency. F. Data displayed on the Display/Control Unit: The following indicators are available on the Display/Control Unit: 1. The UPS load LED bar; 2. The UPS is online; 3. The UPS is on battery; 4. The UPS is in bypass; 5. The UPS is overloaded; 6. The UPS is in fault state; 7. The battery needs to be replaced; 8. The battery capacity/utility voltage LED bar G. Audible Alarms: Using audio signal, the UPS will notify the user about important events. The following is the list of distinct audio alarms: 1. The UPS is on battery; 2. The UPS is on battery and the remaining battery capacity is low; 3. The UPS has shutdown due to low battery capacity; 4. The battery needs to be replaced; 5. The UPS is overloaded; 6. The UPS is in fault state; H. Potential Free (Dry) Contacts: The following potential free contacts may be available on an optional APC SmartSlot Relay I/O Card. 1. The UPS is on battery; 2. The UPS is on ...

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