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Troubleshooting
4–4 975-0012-01-02 Rev A
Clocks
The inverter’s crystal controlled oscillator keeps the frequency accurate to within
a few seconds a day; however, external loads in the system may alter the inverter’s
output waveform causing clocks to run at different speeds. There may be periods
where clocks keep time and then mysteriously do not. This is because most clocks
do not draw enough power to trigger the load sensing circuit. In order to operate,
especially with no other loads present, the inverter’s load sensing circuit will have
to be defeated. Refer to the Operation/Search Mode Watts.
Decreasing Loads
If the amount of power a load draws decreases after it has been switched on (such
as with a small motor) and its current draw becomes less than the load sensing
threshold, it will be turned alternately ON and OFF by the inverter. This can
usually be solved by plugging in an additional load (such as a lamp).
Dimmer Switches
Most dimmer switches lose their ability to dim the lights when used with an
inverter and operate only in the fully ON or OFF position. Newer, microprocessor
controlled dimmers tend to work better in inverter applications.
Fluorescent Lights
Some devices cannot be detected by the inverter’s load sensor and will not
operate. Small fluorescent lights are the most common example. This can usually
be solved by plugging in an additional load. Also, try turning the lamps AC plug
over.
Heavy Loads
If the battery bank cannot deliver the necessary amperage to drive a heavy load,
the inverter will shut OFF. The battery voltage will then slowly rise back above
the low voltage threshold causing the inverter to resume operation. As soon as the
heavy load draws the batteries down, the cycle will continue unless the load is
reduced or an additional source of power is added.
Microwave Ovens
Microwave ovens are sensitive to peak output voltages. The higher the voltage,
the faster they cook. Since the inverter’s peak output voltage is dependent upon
battery voltage and load size, the microwave’s cook time may need to be
increased.