Clary SP Series-Model PD - Manual (Page 15)

T H E C O N T I N U O U S P O W E R C O M P A N Y
15
Utility Voltage Windows and Battery Operation
The UPS operates from utility if the utility voltage is between 85 and 135 VAC. When the utility
falls below 85 VAC or climbs above 135 VAC the UPS operates from the batteries. In the
Standby modes of operation, the UPS relay is activated when the utility is below 100 +/- 2 VAC or
above 130 +/-2 VAC.
There is a programmable noise rejection window, which specifies how the UPS system treats
small time-duration power glitches. Power disturbances must last at least 40ms to trigger change
in operation. Small disturbances on this order occur frequently due to many different conditions.
These disturbances, however, are not detrimental to traffic controllers. To minimize nuisance
switching this noise rejection window is implemented.
After operating in Standby mode, the UPS monitors the utility voltage. When this voltage is
restored to adequate conditions for 30 seconds, the UPS returns utility power to the cabinet.
Description
The Traffic UPS consists of three major components, the UPS Power Module, the Bypass Box,
and the Battery System.
The UPS Power Module consists of the following:
• True on line, double conversion, pure sine wave, high frequency inverter utilizing IGBT
technology.
• Programmable LCD Display.
• Two separate DB9F connectors for remote signal alarms and true RS232 monitoring and
remote communications.
• Auxiliary Temp Sensor
• Multi-stage, temperature compensated battery charger.
The Bypass Box. A three-pole, double-throw switch that switches both hot and neutral lines to
the UPS or cabinet.
The Battery Module. The battery is comprised of one or more strings of 6 individual 12V batteries
connected in series for a total string voltage of 72V DC nominal. The SP2000PD consists of 8
individual 12V batteries connected in series for a total string voltage of 76V DC nominal.
The batteries are extreme temperature, deep cycle, AGM/VRLA (Absorbed Glass Mat/ Valve
Regulated Lead Acid) batteries that have been field proven and tested by the U.S. military. The
OutPost TM batteries supplied by Clary Corporation are certified to operate at extreme
temperatures from –40
°C to +74°C.