OPERATION
Copyright Trace Engineering Company, Inc.
5916 - 195th Street N.E.
Arlington, WA 98223
Telephone: 360/435-8826
Fax: 360/435-2229
www.traceengineering.com
PS Series Inverter/Charger
Part No. 3597
Rev. D: November 23, 1999
Page
59
INVERTER MODE
IN BRIEF
The inverter makes a stepped approximation to a sine wave. The number of steps typically varies from 34
to 52 per cycle. Lower battery voltage and/or higher output power level increases the number of steps.
Higher battery voltage decreases the number of steps. Distortion varies from 3% to 5%. The inverter is
able to control the AC output voltage, allowing the inverter to also sell power into a utility grid or assist
during the operation of heavy loads by operating in parallel with another AC power source such as a
engine powered generator.
SEARCH MODE CONTROL
An automatic search mode circuit is available to minimize the power draw of the inverter when no loads
are being operated. This reduces the power consumption from 16 watts with no load to less than 1 watt
(when using the default settings). To do this, the output is reduced to pulses of a single AC cycle with an
adjustable delay between pulses. These pulses are used to detect the presence of a load. When a load is
detected, the inverter's output goes to full 120 VAC output. The sensitivity of the detection circuit and the
spacing of the pulses are user adjustable using the SWRC.
This feature can save a considerable amount of power, particularly in smaller systems that do not have
loads operating all of the time. In larger systems, this feature may not result in as much savings. If
continuous operation of an AC load is required (such as when powering a microwave clock, VCR timer,
computer, or fax machine), then using the search mode is not recommended.
To enable the search mode:
FROM THE INVERTER
Select SRCH by pushing the ON/OFF button until the yellow LED first comes on. Wait for approximately 5
seconds and the yellow LED will begin to flash slowly to indicate that it is search mode. To disable the
search mode and enable ON mode, press the on the ON/OFF button again (only once).
The yellow INVERT LED on the unit indicates inverter status.
• With the unit OFF, the LED will be off.
• In the Search mode (SRCH), the yellow LED blinks slowly.
• In the Inverter mode (ON) with full output voltage, the yellow LED is on solid.
• In the Charger Only mode (CHG) the yellow LED will double blink and then pause for a second.
WITH THE SWRC
Select SRCH mode from the SET INVERTER menu item, accessible by pushing the red ON/OFF
MENU button on the SWRC. Pressing the ON/OFF MENU button on the SWRC can also access
the SRCH mode. It is also located as the first menu item under the INVERTER MODE (1) menu
heading. To disable the search mode, select ON from the SET INVERTER menu item. Pressing
the SET POINTS buttons will move the cursor either right or left
• With the unit OFF, the all LED’s will be off.
• In the Search mode (SRCH), the yellow LED blinks slowly.
• In the Inverter mode (ON) with full output voltage, the yellow LED is on solid.
• In the Charger Only mode (CHG), the yellow LED is off.
DC AC
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