Schumacher Power Inverter PI-140 - Manual (Page 5)

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4. OPERATING INSTRUCTIONS
1. Push the 12 volt power plug firmly into the 12V accessory outlet.
2. The LED indicator light should glow GREEN, verifying the inverter
is receiving power.
3. Make sure the device to be operated is turned OFF.
4. Plug the device into the inverter AC outlet or USB port.
5. Turn the device on.
6. To disconnect, reverse the above procedure.
NOTE: You may hear a “buzzing” sound being emitted from inexpensive sound
systems when operated with the inverter. This is due to ineffective filters in the
sound system’s power supply. Unfortunately, this problem can only be resolved by
purchasing a sound system with a higher quality power supply or higher quality filter.
5. POWER SOURCE
Your average automobile or marine battery at full charge will provide an ample power
supply to the inverter for approximately 3 hours when the engine is off. The actual
length of time the inverter will function depends on the age and condition of the battery
and the power demand being placed by the device being operated with the inverter.
If you decide to use the inverter while the engine is off, we recommend you turn
OFF the device plugged into the inverter before starting the engine. To maintain
battery power, start the engine every 2 to 3 hours and let it run for approximately
10 minutes to recharge the battery.
Although it is not necessary to disconnect the inverter when turning over the engine, it
may briefly cease to operate as the battery voltage decreases. While the inverter draws
very low amperage when not in use, it should be unplugged to avoid battery drain.
6. LED INDICATOR AND SHUTDOWN PROTECTION
The LED glows GREEN automatically when plugged into a 12 volt DC source and
will not glow under the following conditions:
1. When the power input from the vehicle’s battery drops to approximately 10V,
low battery shutdown occurs and inverter shuts off. Solution: Recharge or
replace the battery.
2. When the power input from the vehicle’s battery exceeds 15V, high voltage
protection occurs. Solution: Reduce the voltage range to between 12V and 14V.
3. The continuous load demand from the equipment or device being operated
exceeds the continuous load rating of the inverter being used. Solution: Use a
higher capacity inverter or lower rated device.
4. The case temperature becomes hot (exceeds 145°F). Solution: Allow the
inverter to cool. Do not block the cooling slots or air flow over and through the
inverter. Reduce the load on the inverter to the continuous rated output.
RESET: To reset after shutdown occurs, remove the 12 volt plug from the
accessory outlet. Check the source of the problem and correct. Reinsert the 12V
plug into the accessory outlet.