Samlex-america SAM-3000-12 User Manual download pdf (Page 6)

4 | SAMLEX AMERICA INC.

SAMLEX AMERICA INC. | 5

SECTION 2 | Description, Features &

Principle of Operation

Load Controlled Cooling Fan

Cooling is carried out by convection and by forced air circulation by load-controlled fan.

The fan will normally be OFF and will be switched ON automatically at the following

loads:

SAM-1000-12 28 to 32 Watts

SAM-1500-12, SAM-2000-12 & SAM-3000-12 90 to 110 Watts

Thiswillreduceenergyconsumptionbythefanandwillincreaseoverallefciency

Principle of Operation

Conversion of 12 VDC from the battery / other DC source to 115 VAC takes place in 2

stages.Intherststage,the12VDCisconvertedtohighvoltageDC(around160VDC)

using high frequency switching and Pulse Width Modulation (PWM) technique. In the

2ndstage,the160VhighvoltageDCisconvertedto115V,60HzModiedSineWaveAC.

(Note:115VistheRMSvalueoftheModiedSineWaveACvoltage.Thepeakvalueof

theModiedSineWaveACvoltagewillbeequaltothevalueoftheabovehighvoltage

of around 160V. See the Fig 2.1 below)

Modied Sine Waveform -

Characteristics & Comparison with Pure Sine Waveform

PleaserefertoFig2.1belowwhichshowsonecycleofModiedSineWaveandPureSine

Wave for comparison.

TIME

180

160

140

120

100

120

140

160

180

Modified Sine

Wave sits at

0V for some

time and then

rises or falls

Sine Wave

Modified Sine Wave

Pure Sine Wave

crosses 0V

instantaneously

Legend

V +

V -

115 RMS

Fig 2.1 Modied Sine Wave and Pure Sine Wave - Comparison

11002-SAM-1000-1500-2000-3000-12-0814.indd 6 14-08-12 9:59 AM

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