Introduction 3
1.0 INTRODUCTION
1.1 System Description
Therole of the parallel-redundant multi-module UPS systemis to supply uninterruptible, clean power to the crit-
icalload. It maintains a full-voltage, low-distortionoutput, even if the utility source power sags orbecomes dis-
torted.
Ifthere is an outage of the source power, theUPS maintains power to the load until an alternatesource of power
isactivated, or until the original power source is restored. Ifinput AC power is not restored, the UPS maintains
theload (with the battery plant) long enough that the critical equipmentcan be shut down in an orderly manner.
TheSeries 600T UPS module displays the rate of battery dischargeand calculates the amount of battery time
remainingbased on the actual connected load. The time that the batterywill maintain the load depends on the
capacityof the battery backup plant and the size of the load.
Thesystem control logic automatically manages criticalbus operation. System logic is resident in Application
SpecificIntegrated Circuits (ASICs) for precise control and improvedreliability.
Ifthe critical load current exceeds the rated load of theS eries600T UPS system, the control logic determines the
magnitudeof the overload and reacts appropriately.Overloads are usually the result of inrush current require-
ments.The UPS system supports loads that are 150% of the rated load for up to 30 seconds and 125% of the
ratedload for up to ten minutes. If the system is operating in the non-redundantmode (e.g., a UPS module is off
line),the overload limits are automatically adjusted.
Figure 1 Multi-Module UPS, 65-80 kVA(left) and 100-500 kVA (right)
Ifthe load surpasses the overload capacity of the UPS, the load is automaticallytransferred to bypass without
interruption.When the load returns to within the UPS rating,it is either automatically or manually returned
DISCONTINUED
PROD U C T