Circuit Breakers: The distribution panel offers slots for eight single or
dual, standard 120 Volt circuit breakers. Two of these breakers, located in the
two center stab positions, must be a 50 Amp unit that act as a main input pro-
tection for each of the lines supplying the remainder of the branch breakers
(up to 12).
Energy Management: The 50 Amp Smart EMS automatically senses the
available power to the motorhome. It determines whether it is connected to a
120 VAC - 30 Amp shore power source, 50 Amp shore power source, or gen-
erator source. Depending upon available power, it controls the operation of 6
possible loads as indicated on distribution panel. These may be any type
load, but are typically heavier loads; those whose use can be “postponed”
until a time when current is available for their use. If the available power
source is 120 VAC - 30 Amp shore power it attempts to keep the total 120
Volt current draw to less than 30 Amps.
Operation: If 120 VAC is not available at the distribution panel, L1 or
L2 outputs, the system shuts itself off. This feature is intended to prevent the
system from drawing current from the +12 VDC battery supply when not in
operation.
When 120 VAC power is applied the system automatically powers up and
determines the nature of the power source.
If the generator is running 120 VAC will be present at the distribution
panel L1 and L2 inputs. In this mode the energy management feature is dis-
abled and all control relay contacts are closed, energizing all of the con-
trolled loads. The control Module sends a signal to the display panel causing
the load meter to display actual load current, the GEN SET service indicator
to light and all power status indicators to light.
If 120 VAC is present at the distribution panel L1 and L2 inputs the sys-
tem will assume that 120 VAC, 30 Amp shore power is available and the
energy management feature will be enabled. If only 20 Amp service is
available the user must select the 20 AMP service mode by momentarily
pressing the 20/30 Amp select switch on the Control Panel. Initially, all
relay contacts are closed, and the total current is monitored. If the total cur-
rent should exceed the service limit the system will turn off the first load in
the shedding table. As it turns the loads off it calculates the amount of cur-
rent that was removed, which is the value for that load. This value is placed
in memory. If the current remains above the service limit the system will turn
off the next load in shedding table. Again, it calculates the amount of current
that was removed and places this value,which is the value of that load, in
memory. The system continues to turn off loads until the total current falls
below the service limit or all of the six controlled loads have been shed.
Electrical Systems - House
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WINDSOR 8•209
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