Eaton 93PM Installation And Operation Manual

Also see for 93PM IBC-L: User and installation guide Manual User and installation guide User and installation guide Installation manual

Contents

Eaton 93PM UPS (60–100 kW, 480V) Installation and Operation Manual P-164000227—Rev 2 www.eaton.com/powerquality 5-1Chapter 5 Understanding UPS Operation5.1 UPS System OverviewThe Eaton 93PM UPS is a continuous-duty, solid-state, transformerless, three-phase, true online system thatprovides conditioned and uninterruptible AC power to the UPS system's output and critical load.The basic system consists of a rectifier, battery converter, inverter, monitoring/operation control panel,integrated communication server, and digital signal processor (DSP) logic. Figure 5-1 shows the main elementsof the UPS system.If utility power is interrupted or falls outside the parameters specified in Chapter 9, “Product Specifications,”the UPS uses a backup battery supply to maintain power to the critical load for a specified period of time oruntil the utility power returns. For extended power outages, the UPS allows you to either transfer to analternative power system (such as a generator) or shut down your critical load in an orderly manner.Figure 5-1. Main Elements of the UPS SystemThe emergency bypass consists of a continuous static switch, and bypass switchgear. The bypass switchgearis located in series with the static switch. The static switch is armed and ready during normal operation.5.2 Single UPSA single UPS operates independently to support an applied load from the inverter, providing conditioned anduninterruptible AC power to the critical load from the output of the module. During an outage, the invertercontinues to operate, supporting power to the load from the battery supply. If the unit requires service, appliedloads are transferred to the internal bypass either automatically or manually. With the exception of an optionalexternal battery cabinet, no other cabinets or equipment are required for the single UPS to successfully supportits applied loads.AC Input toRectifier/ChargerAC Outputto CriticalLoadRectifierSwitchgearBatterySwitchgearBatteryConverterBatteryInverterSwitchgearUPS CabinetBypassSwitchgearStaticSwitchDigitalMeteringInverterRectifierPower ModuleAC Input toBypass