10 | SAMLEX AMErICA INC.
(150 Hz), 5th (250 Hz), 7th (350 Hz) and so on. The high frequency harmonic content in a Modi-
fied Sine Wave produces enhanced radio interference, higher heating effect in inductive loads like
microwaves and motor driven devices like hand tools, refrigeration / air-conditioning compressors,
pumps etc. The higher frequency harmonics also produce overloading effect in low frequency
capacitors due to lowering of their capacitive reactance by the higher harmonic frequencies. These
capacitors are used in ballasts for fluorescent lighting for Power factor improvement and in single-
phase induction motors as start and run capacitors. Thus, Modified and Square Wave Inverters
may shut down due to overload when powering these devices.
1.3.2 Advantages of Pure Sine wave inverters
The output waveform is a Sine Wave with very low harmonic distortion and cleaner power
like Grid / Utility supplied electricity.
Inductive loads like microwaves, motors, transformers etc. run faster, quieter and cooler.
More suitable for powering fluorescent lighting fixtures containing Power factor Improve-
ment Capacitors and single phase motors containing Start and run Capacitors.
reduces audible and electrical noise in fans, fluorescent lights, audio amplifiers, TV, fax and
answering machines.
Does not contribute to the possibility of crashes in computers, weird print outs and glitches in
monitors.
Some examples of devices that may not work properly with Modified Sine wave and
may also get damaged are given below:
Laser printers, photocopiers, and magneto-optical hard drives.
built-in clocks in devices such as clock radios, alarm clocks, coffee makers, bread-makers,
VCr, microwave ovens etc. may not keep time correctly.
Output voltage control devices like dimmers, ceiling fan / motor speed control may not work
properly (dimming / speed control may not function).
Sewing machines with speed / microprocessor control.
Transformer-less capacitive input powered devices like (i) razors, flashlights, night-lights, smoke
detectors etc. (ii) Some re-chargers for battery packs used in hand power tools.
These may get
damaged. Please check with the manufacturer of these types of devices for suitability.
Devices that use radio frequency signals carried by the AC distribution wiring.
Some new furnaces with microprocessor control / Oil burner primary controls.
High intensity discharge (HID) lamps like Metal Halide lamps.
These may get damaged. Please
check with the manufacturer of these types of devices for suitability.
Some fluorescent lamps / light fixtures that have Power factor Correction Capacitors.
The
inverter may shut down indicating overload.
Induction Cooktops.
1.3.3 Power rating of inverters
i
inFo
for proper understanding of explanations given below, please refer to definitions
of Active / reactive / Apparent / Continuous / Surge Powers, Power factor, and
resistive / reactive Loads at Section 1.2 under “DEfINITIONS”
SECTIOn 1 |
Safety Instructions & general Information
