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Troubleshooting
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freewheel when power is removed (e.g. a grinder). This long transfer may cause
computers or other sensitive equipment to operate incorrectly. If power glitches
must be minimized then Xantrex recommends that motor loads not be operated
when the sensitive equipment is being used.
Problem Loads
Very Small Loads If the power consumed by a device is less than the threshold of the Load Sense
mode circuitry, the device will not run. See the Configure PROsine—Basic
Menu on page 4–7 and the Configure PROsine—Advanced Menu on page 4–8
for ways to solve this problem. Most likely the solution will be to defeat the Load
Sense mode feature.
Fluorescent Lights
& Power Supplies
Some devices cannot be detected when scanned by Load Sense circuitry. Small
fluorescent lights are the most common example. Some computers and
sophisticated electronics have power supplies that do not 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 on by
defeating the search mode feature. See the Configure PROsine—Basic Menu on
page 4–7 and the Configure PROsine—Advanced Menu on page 4–8 for ways
to solve this problem.
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 Configure PROsine—Basic Menu on page 4–7 and
the Configure PROsine—Advanced Menu on page 4–8 for ways to do this. 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 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. The solution is to
reduce the load sense power threshold.
Electronics AM radios will pick up noise, especially on the lower portion of their band.
Inexpensive tape recorders are likely to pick up a buzz.
Computers When the inverter is called on to start a large load—particularly a motor load—the
output voltage may dip briefly. This dip may cause computers powered by the
inverter to crash.