8 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 9
Non-Linear Load: A load that does not draw a sinusoidal current when a sinusoidal volt-
age is fed to it. For example, non-power factor corrected Switched Mode Power Supplies
(SMPS) used in computers, audio video equipment, battery chargers, etc.
Resistive Load: A device or appliance that consists of pure resistance (like filament
lamps, cook tops, toaster, coffee maker etc.) and draws only Active Power (Watts) from
the inverter. The inverter can be sized based on the Active Power rating (Watts) of
resistive type of loads without creating overload (except for resistive type of loads with
Tungsten based heating element like in Incandescent Light Bulbs, Quartz Halogen Lights
and Quartz Halogen Infrared Heaters. These require higher starting surge power due to
lower resistance value when the heating element is cold).
Reactive Load: A device or appliance that consists of a combination of resistive, inductive
and capacitive elements (like motor driven tools, refrigeration compressors, microwaves,
computers, audio/ video etc.). The Power Factor of this type of load is <1 e.g. AC motors
(PF=0.4 to 0.8), Transformers (PF=0.8), AC to DC Switch Mode Power Supplies (PF=0.5
to 0.6) etc. These devices require Apparent Power (VA) from the AC power source. The
Apparent Power is a vectorial sum of Active Power (Watts) and Reactive Power (VAR).
The AC power source has to be sized based on the higher Apparent Power (VA) and also
based on the Starting Surge Power.
2.2 OUTPUT VOLTAGE WAVEFORMS
TIME
360
320
280
240
200
160
120
80
40
0
40
80
120
160
200
240
280
320
360
Modified Sine
Wave sits at
ZERO for some
time and then
rises or falls
V
PEAK
= 325.22V
Modified Sine Wave
Sine Wave
Pure Sine Wave
crosses Zero Volt
instantaneously
V
PEAK
= 280 to 320V
V
RMS
= 230 VAC
VOL
TS (+)
VOL
TS (
–)
20 ms
Fig. 2.1: Pure and Modified Sine Waveforms for 230 VAC, 50 Hz
The output waveform of the Samlex PST series inverters is a Pure Sine Wave like the
waveform of Utility / Grid Power. Please see Sine Wave represented in the Fig. 2.1 that
also shows Modified Sine Waveform for comparison.
SECTION 2 |
General Information
Summary of Contents for PST-60S-48E
Page 47: ...SAMLEX AMERICA INC 47 NOTES...
