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CSI SECTION 16611 STATIC UNINTERRUPTIBLE SYSTEM
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;
CSI SECTION 16611 STATIC UNINTERRUPTIBLE SYSTEM