ATD Tools ATD5950 Manual

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REV03‐13

InverterProtectionFeatures

TheREDLEDIndicatorlightwillturnonandtheinverterwillturnitselfoffautomaticallywhen:

1. Thepowerinputfromthebatterydropsto9.5volts.(Whenthepowerinputdropsto10.5volts,analarmwill

soundforanextendedperiod).

2. Thepowerinputfromthebatteryexceeds

15.5volts.

3. Thecontinuousdrawoftheequipmentorappliancebeingoperatedexceeds200watts.

4. Thesurgedrawoftheequipmentorappliancebeingoperatedexceeds400watts.

5. Thecircuittemperatureexceeds165°F.

Note

• Theinverterisequippedwithacoolingfanwhichisdesignedtorun continuouslywhiletheinverteris

operating.Automaticshutdowncausedbyhighcircuittemperatureswilloccurwhenthecoolingfanis

unabletomaintainacoolenoughtemperatureforsafeoperationoftheinverter.

• Inthe

eventofautomaticshutdownorcontinuousaudiblealarm,turntheinverterrockerswitchtothe

OFF(0)positionuntilthesourceoftheproblemhasbeendeterminedandresolved.

HowPowerInvertersWork

There are two stages in which a power inverter changes the 12‐volt DC (or battery) power into 110V AC

(householdcurrent).



STAGE1:

TheinverterusesaDC‐to‐DCconvertertoincreasetheDCinputvoltagefromthepowersourceto145voltsDC.



STAGE2:

Theinverter

thenconvertsthehighvoltageDCinto110VAC(householdcurrent),usingadvancedMOSFET(Metal‐

oxide‐SemiconductorFieldEffectTransistor)transistorsinafullbridgeconfiguration.Thisdesignprovidesallour

inverters withthecapabilitytostartandrundifficultreactiveloads,whileprovidingexcellentoverloadcapability.

Thewaveformthatis

generatedbythisconversionisa"modifiedsinewave"asshowninthediagrambelow.







The modified sine wave produced  by our inverters has a root mean square (RMS)  voltage of 110 volts. The

majorityofACvoltmetersarecalibratedforRMSvoltageandassumethatthemeasuredwaveformwillbeapure

sinewave.Consequently, thesemeterswillnotread theRMS modified

sinewavevoltage correctlyand,when

measuringtheinverteroutput,themeterswillreadabout20to30voltstoolow.Toaccuratelymeasureofthe

outputvoltageoftheinverter,useatrueRMSreadingvoltmetersuchasaFluke87Fluke8060ABeckman4410,

Triplet4200oran ymultimeter

identifiedas"TrueRMS"

