Theory of Operation
IQ SERIES OWNERS MANUAL - 33 -
When shore power is applied while the inverter is OFF, the charger will remain OFF. The ON/OFF Switch,
or Remote Switch, must be pushed to the START position to start the charger, which also allows the inverter to
come ON automatically when shore power is removed.
Ambulance Mode: (It is common in these applications for the shore power cord to accidentally become
unplugged. If the inverter was in Standard Mode and the shore power became unplugged, the inverter would
automatically come on and the vehicle batteries would be run down. Ambulance Mode is offered to prevent this.)
Intended for ambulance and fire truck applications, in Ambulance Mode the inverter will remain OFF when
shore power is removed even if the inverter was ON when shore power was connected. The system will not
operate like a UPS. After shore power is removed, the ON/OFF Switch, or Remote Switch, must be pushed to the
START POSITION to start the inverter.
As long as the ON/OFF Switch and Remote Switch are in the RUN POSITION, the charger will turn ON
when shore power is applied.
How to select Ambulance Mode: Selection is accomplished by relocating the two-pin jumper found on terminal
J3 on the LED Display Circuit Board. The factory position of the jumper is over only one pin for Standard Mode.
To select Ambulance Mode place the jumper over both pins. See Figure 1 (below).
Turn the inverter OFF. Remove the front cover of the inverter to gain access to the LED circuit board located at
the front of the inverter. Terminal J3 is a two-pin terminal identified on the circuit board and located approximately
1” above the yellow bulk charge indicator light. The factory position of the jumper is outlined on the board over
only one pin for Standard Mode.
To select Ambulance Mode remove the jumper from the factory position and reinstall the jumper over both pins of
terminal J3.
To reselect Standard Mode install the jumper over only one pin of terminal J3.
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