Problem Loads in Load Sense

present a load until line voltage is available. When this occurs, each unit waits for the other to begin. To drive these loads either a small companion load must be used to bring the inverter out of its search mode, or the inverter may be programmed to remain at full output voltage by defeating the search mode feature. See “Section 3: Configuration” (page 25 and following).

Clocks- The inverter’s crystal controlled oscillator keeps the frequency accurate to within a few seconds a day. Most clocks do not draw enough power to trigger the load sensing circuit. In order to operate without other loads present, the load sensing will have to be defeated. See “Load Sense” information in “Section 3: Configuration” (page 25 and following). Clock accuracy is also affected by the accuracy of the generator. The best solution is to buy a battery-operated clock, or a clock that is not dependent on line frequency or voltage. Any clock with a crystal controlled oscillator will probably work just fine.

Searching- If the amount of power a load draws decreases after it turns on, and if this “on” load is less than the load sensing threshold, it will be turned alternately on and off by the inverter. Incandescent light bulbs may present this problem when the search threshold is set near the wattage rating of the bulb.

Other Problem Loads

Electronics- AM radios may pick up noise, especially on the lower portion of their band. Inexpensive tape recorders are likely to pick up a buzz.

Computers - Computers may crash if large loads are started while the inverter is operating. The inverter output voltage may fall briefly, allowing computers to fall. Large motors may generate voltage spikes that are not completely suppressed by the inverter's internal voltage transient suppression circuit.

86

Prosine 2.5/3.0 Installation & Operation Guide