8 • 303
Electrical Systems
2004 • LaPalma
Energy Management:
The 50 Amp Smart EMS automatically senses
available power to the motorhome, determining whether it is connected to a
120 Volt AC - 30 Amp shore power source, 50 Amp shore power source or
generator source. Depending upon available power, the EMS controls the
operation of 6 possible loads as indicated on the 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 use. If the available
power source is 120 Volt AC - 30 Amp shore power, the EMS attempts to keep
the total 120 Volt current draw to less than 30 Amps.
Operation:
If 120 Volt AC 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 Volt DC battery supply when not in
operation.
When 120 Volt AC power is applied, the system automatically powers up
and determines the nature of the power source.
If the generator is running, 120 Volt AC will be present at the distribution
panel L1 and L2 inputs. In this mode the energy management feature is
disabled and all control relay contacts are closed, energizing all of the
controlled 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 Volt AC is present at the distribution panel L1 and L2 inputs, the
system will assume that 120 Volt AC, 30 Amp shore power is available and
enable the energy management feature.
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 current
should exceed the service limit, the system will turn off the first load in the
shedding table, calculating the amount of current 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 calculating the amount of current that was removed and placing 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. Through this process the system has
“learned” the amount of current that each particular load draws. This feature
compensates for the differences in current draw over a range of line voltage
and ambient temperature, by re-learning the load each time it is turned off or
“shed.”
The 50 Amp Smart EMS now waits until the total current is lower than the
service limit and enough current is available (as compared with the amount in
memory for the last load shed) before turning that load back on. This assures
that there is sufficient current to operate the load.
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