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Trace Engineering Co. Inc. Tel (360) 435-8826 Part Number 3179
5916 195
th
Street, NE Fax (360) 435-2229 Effective August 6, 1998
Arlington, WA 98223 USA www.traceengineering.com Page
9
Shore Power Amps Monitoring
Series II models monitor the current drawn by the built-in charger and any AC loads. These current
requirements may exceed the amperage rating of the shore power circuit breaker. To prevent
unnecessary tripping of this circuit breaker, the inverter limits the current draw to a maximum
between five and 30 amps, set by using the RC7 remote control. Shore power amps is pre-set at the
factory to a maximum of 25 amps.
VAC Dropout
Series II model inverter/chargers monitor the voltage of the AC power passing through to the charger
and AC loads. When AC voltage falls below a pre-set level, the inverter automatically transfers from
AC power to DC power. This dropout voltage is factory pre-set to 40 volts. You can re-set this
voltage from 40 to 100 volts using the RC7 remote control. Using a lower voltage results in less
frequent transfers from AC to DC power, but may cause undesirable operation of some AC loads,
including brown-outs and damage.
Search Mode Circuitry
The Legend Series II inverters feature circuitry that minimizes power drain by reducing the inverter’s
output to small test pulses when there is no load connected to the inverter. These pulses are used to
detect the presence of a load. When a load is detected the inverter’s output goes to full voltage. The
sensitivity of the detection threshold is adjustable from about five watts to 40 watts using the RC7
remote control. This feature is defeated (turned Off) at the factory and can only be activated using
the RC7 remote control.
Example: With the threshold set to detect a 40 watt load, a 50 watt load will bring the unit to full
output voltage. However, a 30-watt load will leave the inverter in its energy saving search mode
state. If the sensitivity is increased by setting the control to 10, a 20 watt load will bring the inverter
out of the search mode, while a five-watt load will not.
When in the search mode, the green Power LED will blink. At full output voltage, the LED will remain
lit. When the inverter is used as an un-interruptable power supply, the search mode function should
be defeated. A neon type nightlight can also be used as a good indicator to determine if the inverter
is in search mode. Simply plug the light into any AC outlet that is connected to the inverter’s output.
When the inverter is in the search mode the light will blink. If the inverter is running a load, the light
will be on continuously.
Exceptions: (Murphy’s Law) Unfortunately, things don’t always work the way the manual says they
will.
Example A: If the threshold is set to detect a 40-watt load and a 30-watt incandescent light is turned
on, the inverter will detect the light. The light is a bigger load than 40 watts when its filaments are
cold. When the light gets hot it becomes a 30-watt load. Since this is below threshold of 40-watts, the
inverter will not detect it and the light will go out. This will cause the light to cycle repeatedly.
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