Mandalay 2006 Presidio, Manual

Page: 94 / 130

The Energy Management System (EMS) consists of two parts: the display panel and the
distribution panel. The display panel is mounted above the entry door for visibility and use.
The distribution panel is located at the foot of the bed in the bedroom and is a 120/240 volt
power distribution and energy management system.
The system will automatically sense the available power to the vehicle and will determine
whether it is connected to a 120 VAC - 30 Amp shore power source, 240 VAC - 50 Amp shore
power source, or Generator source. Depending on the available power, it controls four loads:
1 - Water Heater, 2- Rear A/C, 3 - Washer/Dryer, and 4 - Front A/C. The system will shed or
turn off these appliances in the same order if the system senses that the load is larger then
the supply. Shedding simply means that power to that appliance had been turned off to lower
the Amp draw. These appliance are loads whose use can be postponed until a time when
current is available for their use. For example: if the power source is 120 VAC - 30 Amp shore
power, the system will attempt to keep the total 120 volt current draw to less then 30 Amps.
The 20 Amp service mode is not automatically detected and the operator must manually
select the 20 Amp mode when 20 Amp service is available.
The display panel above the entry door will show what type of service is providing power on
the left side of the panel under "Service Type". The center of the panel indicates how many
amps are being drawn at any given moment. If you are connected to 30 Amp shore power
and the panel shows 28 amps, and you decide to turn on or plug in an additional item, the
system may or may not begin the shedding process. If the amp draw would rise above the
supplied 30 Amps the shedding process would begin with shedding the Water Heater first to
lower the Amp draw back down to the supplied 30 Amps. If the draw does not lower enough
then the system would shed the next item to lower the Amp draw and so forth.
When connected to 50 Amp - 240 VAC service or generator service, the Energy Management
features of the unit are disabled and the unit switches all controlled loads "ON" and will not
shed loads. In either of these modes if the load usage should require more then is present,
you will trip the supply line breaker. If connected to a 50 Amp - 240 VAC a signal is sent to
the display causing the load meter to go blank, the 50 Amp service indicator to light, and all
power status indicator to light. If the Generator is running, the energy management feature is
disabled and a signal is sent to the display causing the load meter to display actual load
current, the GEN SET service indicator to light, and all power status indicator to light.
7-12
ELECTRICAL SYSTEMS
2005 PRESIDIO
EMERGENCY MANAGEMENT SYSTEM (OPTIONAL)