Eaton Power-Sure 700 Instruction Manual
Also see for Power-Sure 700: Installation and user manualInstallation and user manualInstallation and user manual
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Contents
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3Main transformerInstruction manual IM1002004E September 2015 www.powerquality.eaton.comMain transformer●● Windings: all copper●● Magnetics: grain orientated, M6 grade, stress-relievedtransformer steel is utilized for minimum losses andmaximum efficiency●● Insulation: Class (N) 200 all sizes●● Shielding: multiple triple copper shield to minimizeinterwinding capacitance, transient, and noise couplingbetween primary and secondary windings●● Cooling: convection, operating temp is 130 degreesCelsius maximum rise above ambient●● Isolation: output is fully isolated from inputCabinetHeavy-gauge industrial steel throughout. Metal isanti-corrosive phosphate treated prior to paint. Paintis a baked finish.Input breakerMain input molded-case circuit breaker, rated at 125% of fullload input current.Industry standardsListed to UL 1012, standard for “power units other thanClass 2.”Theory of operationThe Power-Sure 700 provides the triple function of isolation,noise attenuation and voltage regulation. The first twofunctions are provided by the power transformer, where asthe third function of voltage regulation is achieved throughsolid-state thyristors (SCRs) connected to taps on the powertransformer. A microprocessor monitors and controls theoverall function of regulating the system.The power transformer is manufactured with a uniquemethod of shielding which produces very low capacitivecoupling between the primary and secondary. This lowcoupling provides excellent attenuation of the common-mode noise. In addition, special care is taken in the designof the transformer to attenuate transverse-mode noiseabove 1000 Hz.The power transformer has taps to which solid-stateswitches (SCRs) are connected.The voltage regulator incorporated in the Power-Sure 700is microprocessor controlled to achieve optimum correctiontime of input voltage sags and surges. The response time istypically one half (1/2) cycle for 100% correction, therefore,a very smooth switch takes place undetected by computerequipment.As the input voltage (building power) varies, the voltageavailable at each tap of the transformer will also change.The amount of variation is dependent upon the input sagor surge, turns ratio, and transformer losses.By selecting a particular tap voltage, the output can be keptwithin a tight range. The way in which this is accomplishedis that an electronic control card using a microprocessorcontinually monitors the input voltage. When a voltagefluctuation occurs, which exceeds the limit of rated regulation(typically ±3%), the output is switched to another tap, thatis within the required range. This “switch” will be made atthe next current zero crossing to allow for both leading andlagging power loads to be connected to the conditioner. |
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