Theory of Operation
- 32 - IQ SERIES OWNERS MANUAL
amps, 20 amps, 15 amps and 10 amps. For inverter/charger serial numbers 02154-049638 and higher the
Remote APM Panel selects APM Settings of 30 amps, 15 amps and 10 amps and 0 (zero) amps.
In motor home applications where the available shore power source may be limited from campground to
campground the Remote APM Panel is useful in preventing nuisance tripping of the shore power circuit breaker.
The APM Setting can be adjusted to suite the shore power source or to zero.
As a battery charger control the Remote APM Panel can be used as an alternate, and remote, means of adjusting
the battery charger output amps to values less than the program switch setting. The ratio between battery charger
DC output amps to AC1 input amps is approximately 4:1. Remote APM Panel settings of 30, 15, 10 and 0 (zero)
correspond to battery charging DC amperages of 120 amps, 60 amps, 40 amps and 0( zero) amps.
Example 1: Shore power is connected only to AC1. AC2 is not being used. (This means the battery charger and
the AC loads are both being fed by AC1.) The Remote APM Panel is set at 15 amps. The AC passthrough load is
drawing 10 amps.
Under these conditions the APM circuit will allow the battery charger to draw up to 5 AC amps. If the
AC passthrough load is increased beyond the 15 amp APM Setting then the APM will reduce the AC power
consumed by the battery charger to zero AC amps.
Example 2: Both AC Input 1 and AC Input 2 are receiving power and the APM Panel switch is set at 15 amps.
Under these conditions the battery charger will be allowed to draw up to 15 AC amps regardless of the AC
passthrough load. This would correspond to a 12 volt battery charging setting of approximately 60 amps.
5.5 Automatic Throttle Control Terminal J31 Theory of Operation
Terminal J31 is provided on all model and is to be used on utility vehicles where the inverter needs to operate
continuous heavy AC loads and the vehicle is equipped with an Automatic Throttle. Use J31 to turn ON the Auto
Throttle to insure that the vehicle alternator is producing maximum output whenever the inverter is powering a
load.
J31 is controlled by the Load Demand circuit therefore Programming Switch 2 must be in the ON position when
Terminal J31 is used.
J31 is a 1/4" spade terminal located in the lower right midsection of the control circuit board. The terminal is
designed to provide ground control for a Bosch relay, Vanner part number 05235 or equal. Install a 1 amp fuse in
line near the inverter.
5.6 Ambulance Mode and Standard Mode Theory of Operation
General: Ambulance Mode and Standard Mode only applies to inverter/charger models.
In both modes, if the inverter is ON when shore power is applied, the charger will turn ON and will pass
power through. Then, when shore power is removed, the inverter will automatically turn ON to continue to supply
power to the AC loads.
In both modes, if the ON/OFF Switch is in the OFF POSITION, the system is locked OFF and neither the
inverter nor the charger will operate, even if the Remote Switch is turned ON.
Standard Mode: The inverter and the charger functions are controlled together by the ON/OFF Switch. The
system will only operate like a UPS (Uninterruptable Power Supply).
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