Product Manual

Operation
32 900-0198-01-00 Rev A
Auxiliary Terminals
The FX inverter has a 12V AUX output which can respond to different criteria and control many operations.
These terminals provide a 12 Vdc output that can deliver up to 0.7 Adc.
The AUX output has three states: continuous
Off
, continuous
On
, and
Auto
, which allows that output to
be activated using the automatic auxiliary functions. (All functions are defaulted to
Auto
.) These items are
based in the inverter and accessed using the system display. The system display and other devices also
have programming, such as AGS, that can control the AUX outputs. To avoid conflicts, the output should
be turned
Off
when the AGS function is active.
For the FX automatic functions, typical applications include signaling a generator to start, sending a fault
alarm signal, or running a small fan to ventilate the batteries. When considering these applications, plan
for both connection requirements and programming with the system display.
The AUX terminals have a series of set points which are used by various functions. Not all points are used
by all functions. Each mode description (below) will show the set points used by that function.
 Low DC voltage settings
 High DC voltage settings
 On delay settings, in increments of 0.1 minutes
 Off delay settings, in increments of 0.1 minutes
These settings are not temperature compensated. Compensation is only used for inverter battery charging.
There are nine functions, each geared toward a different application. They are summarized on page 34.
NOTE:
The AUX output is defaulted to
Vent Fan
. A sealed FX inverter with the Turbo Fan is
required to use the AUX output for fan control. In a single-inverter system, no other
functions can be used.

Cool Fan
activates the AUX output when the inverter reaches a high internal temperature. It is intended to
trigger a small external fan for additional cooling. See the Warning Troubleshooting table on page 41 for a
description of the fan criteria.
 This function does not have settable parameters.

DC Divert
activates the AUX output to divert (or “dump”) excess renewable energy to a DC load, such as a
resistor, a heater, or a fuel cell. This prevents overcharging of the batteries. This function can serve as rough
charge regulation for an external charging source.
 When battery voltage rises above a settable high voltage level, the AUX output is activated after a settable delay. The
AUX output controls a larger, external relay. When energized, the relay allows current to flow from the batteries to a
dedicated DC load. The resistor or load must be sized to dissipate all of the energy from the renewable source if
necessary. Diversion will turn off following a delay when a low DC voltage setting is reached.
 Settable parameters include:
 Low and high DC voltage
 On and off delay

AC Divert
activates the AUX output to divert (or “dump”) excess renewable energy to an AC load, usually an AC
device powered by the inverter itself. This prevents overcharging of the batteries. This function can serve as
rough charge regulation for an external charging source.
 When battery voltage rises above a settable high voltage level, the AUX output is activated after a settable delay. The
AUX output controls a larger relay, which allows current to flow from the batteries to a dedicated AC load when
energized. Diversion is usually used to regulate battery charging. The AC device is usually wired to the output or load
panel and must be left on. It must be sized to dissipate all of the energy from the renewable source if necessary.
Diversion will turn off following a delay when a low DC voltage setting is reached.
 The AUX output will automatically turn on to run the loads if the inverter accepts an AC source.