Clary SP170-PDA - Manual (Page 17)

17
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.
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.
• Multi-stage, temperature compensated battery charger.
The Batteries. 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 2000VA uses 8 individual
12V batteries connected in series for a total string voltage of 96V 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.
The batteries are provided with appropriate interconnect wiring harness. Optional battery
mounting trays and brackets are available.
The interconnect cable connects to the base module via a quick-release circular connector.
The UPS module includes a charger that replenishes the Battery Pack whenever possible and
required. This charger operates with a maximum charging current of 0.6A. An optional “Fast
Charger” module can be installed into the UPS module to increase the charging current to over
3A.