Jayco Precept, Owner'S Manual

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Section 6: Electrical System
Automatic Transfer Switch (ATS)
Your motorhome is equipped with an Automatic Transfer Switch. The ATS is microproces-
sor controlled and will automatically detect which power source is being used (generator
or shore power) and allow power from that connection only. You will not have to plug and
unplug power to the coach if you decide to run the generator.
If you plug into shore power, the ATS will pass power to the motorhome. If the generator
is started, it will override the shore power input (called generator dominant) and supply the
RV with electrical power from the generator. When the generator is shut down, shore power
is restored.
There may be a slight flicker of the lights when the ATS changes over from one to the other,
but there is no real interruption of power.
The ATS will disconnect from shore power completely if the power coming in is not high
enough quality (i.e. either low/high voltage, or low/high frequency).
When the generator is operating, it powers the inverter/charger which in turn functions as a
multi-stage battery charger to charge the house auxiliary and chassis batteries.
Refer to and follow safety information found in the manufacturer’s troubleshooting guide
found in your warranty packet
.
NOTE: The (diesel or gas powered) generator requires 12-volt
power from the house auxiliary batteries to start, and draws (diesel
or gas) fuel to operate from the chassis fuel tank. If the fuel level
in the chassis fuel tank drops to or below ¼ full, the generator will
automatically shut “off” and cannot be re-started until the fuel tank is
filled to above ¼ full.
Load Center
The Load Center contains 12VDC fuses
and 120VAC circuit breakers for almost
all of the electrical appliances and circuits
in the RV. The 120V main breaker may
be located in this panel and will turn off
all 120-volt power to the RV. Locations
will vary by model. Refer to the diagram
inside the load center for specific fuse as -
signments.
Motorhomes may have separate small
panels for breakers and fuses. They are
normally located in close proximity to
each other typically in the bed platform. The converter is also mounted separately (typically
under the bed platform).
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