PRINCIPLE OF OPERATION
     The inverter converts power in two stages. The first stage is a DC to DC conversion process that raises the low voltage DC at the inverter input to 280 volts DC. The second stage is the actual inverter stage that converts the high voltage DC into 230 volts, 50 Hz AC(rms). The DC-to-DC converter stage uses modern high frequency power conversion techniques that have replaced the bulky transformers found in less technologically-advanced models. The inverter stage uses advanced power MOSFET transistors in a full bridge configuration. 

THE OUTPUT WAVEFORM
     The AC output waveform of the H-series inverter is known as “modified sine wave”. It is a waveform that has characteristics similar to the sine wave shape of utility power. This type of waveform is suitable for most AC loads, including linear and switching power supplies used in electronic equipment, transformers, and motors.
     The modified sine wave produced by the H-series inverter has an RMS (root mean square) voltage of 230 volts, which is the same as standard household power. Most AC voltmeters (both digital and analog) are sensitive to the average value of the waveform rather than the RMS value. They are calibrated for RMS voltage under the assumption that the waveform measured will be a pure sine wave. These meters will not read the RMS voltage of a modified sine wave correctly. They will read about 20 to 30 volts low when measuring the output of the inverter. For accurate measurement of the output voltage of this unit, use a true RMS reading voltmeter such as a Fluke 87III, Fluke 8060A, Fluke 77/99 series or Beckman 4410.


TROUBLESHOOTING GUIDE

TROUBLE/INDICATION
POSSIBLE CAUSE
SUGGESTED REMEDY
No AC output;
Red LED lit
Green LED not lit
DC input below 10.5 volts Recharge or replace battery
Inverter overheatàthermal shutdown Remove or reduce load, wait for inverter to cool.
No AC output;
Red & Green LED not lit
Inverter fuses open Contact technical support
Non-continuous AC output;
Red LED lit on & off
Green LED lit
Inverter output power limited by overload / short circuit protection circuit Reduce load or remove short circuit.
No AC output (latch up);
Red LED lit
Green LED lit
Earth fault protection is activated by excessive current leakage from the load. Unplug the faulted load.
Low battery alarm sounds abnormal Bad connection or wiring Tighten all DC connections
Low battery alarm sounds Low battery voltage Recharge or replace battery
Motorized power tool won’t start Excessive start-up load If appliance does not start, then appliance is drawing excessive wattage and will not work with inverter
Motorized power tool does not operate at correct speed Purely inductive load Make the load not purely inductive. Operate an incandescent lamp at same time as motor
TV/ Radio interference;
Snow in picture, buzz in speaker
Appliance too close to inverter Keep inverter and antenna distant from each other. Use shielded antenna cable. Connect antenna with amplifier.


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