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ELECTRICAL
AUTOMATIC GENERATOR START (AGS)
On coaches equipped with AGS, the generator will start
and provide 120 Volt power if the incoming shore power
voltage is not present and startup parameters are met.
AUTOMATIC TRANSFER SWITCH
Current coaches with a generator will also have a transfer
switch installed in the cord compartment. An automatic
transfer switch converts two inputs and connects them to
a single common output.
The shore power cord is connected to one of the inputs,
while the generator is connected to the transfer switch’s
second input.
Automatic transfer switches are logic-controlled to
convert under a given set of conditions. The transfer
switches used in RVs are typically generator priority
switches which connect to shore power under normal
use. As soon as the transfer switch detects the presence
of 120 Volt power on the generator input lines, it will
switch over to the generator’s inputs and drop the
connection to shore power.
Transfer switches are designed so that only one input
can be connected at a time in order to prevent any back
feeding of electrical power. In addition, RV transfer
switches generally have a built-in delay allowing the
generator to warm up and speed up before actually
switching the load. This prevents stalling or stumbling
while the engine is still cold and not producing full power.
MAIN SERVICE PANEL BREAKER BOX
The main service panel or 120 Volt breaker box is
typically located inside a bathroom, bedroom, or front
overhead cabinet depending on the coach model and
floor plan. The breaker box contains the main 50 Amp (or
30 Amp if equipped) breaker and the individual breakers
protecting each circuit from overload conditions. Any unit
equipped with two air conditioners or more must have
50 Amp service. The task of the breaker is to “trip” if the
current exceeds the amperage rating on the breaker to
prevent damage to the wiring of the circuit.
Breakers positioned next to each other are on
di
ff
erent poles in a 50 Amp panel. If only part of the
electrical circuits are working, you may have a poor
connection at shore power. In this instance, power is
most likely only being provided to one pole or leg.
IMPORTANT
!
The breakers are resettable by simply flipping the
breaker to the ‘o
ff
’ position, and then back to the ‘on’
position once the overload condition is removed. All 120
Volt circuit breakers are located in the main service panel
unless the coach is equipped with an inverter/charger.
These units are also equipped with a subpanel.
SUBPANEL
The subpanel is a smaller 120 Volt breaker box
containing the breakers for the circuits which the inverter
is wired to power. It is typically located near the main
breaker box unless the coach is equipped with an Energy
Management System (EMS). In this case, the subpanel
is often located within the EMS panel. The subpanel is
installed to limit the AC power use to specific circuits
when the electricity is supplied by the inverter. Some
inverters may be used to power a specific circuit. In this
case, a subpanel is not used.
Summary of Contents for VENTANA 2022
Page 1: ...SM 2022...
