8 • 304
2004 • LaPalma
Electrical Systems
NOTE: There is a two minute minimum delay period after a load
is shed before the load will be turned on again to prevent air
conditioners from turning on with a head pressure.
Three Hour Averaging:
The RVIA (Recreational Vehicle Industry
Association) in conjunction with the NEC (National Electrical Council) have
established rules regarding the rating of electrical systems and the use of
energy management systems. One of these rules requires that, if any energy
management system is used, the average total load current for the system
over a 3 hour period be limited to 80% of the service rating. For that reason
the 50 Amp EMS calculates the average running current for the system, and
if it exceeds 80% of the service rating, the EMS sheds loads to reduce the
average current below that limit.
For example, if a system operating under 120 Volt AC, 30 Amp service
has been running at the 30 Amp limit for three hours, the EMS will change
its shedding threshold to 24 Amps and turn off loads until the 24 Amp limit
is attained. If the user selects the 20 Amp service mode this limit will
translate to 16 Amps. Because the EMS calculates a running 3 hour average,
if the average load current drops below the limit the system will restore
power to loads based on their impact on the limit. If the system is in the
averaging mode the decimal point at the lower right corner of the load meter
display on the display panel will illuminate.
Display Panel:
The display panel connects to the distribution panel
located in the bedroom. Six power status LED’s indicate power is applied to
those loads. These LED’s are on when the power is applied. The load meter
has a two digit display to indicate the amount of current actually being drawn
by all the appliances in the motorhome.
Four service type LED’s indicate the source for 120/240 Volt AC power.
Three of these sources are automatically detected and indicated by the EMS,
namely: Gen Set Service, 50 Amp Service and 30 Amp Service.
The 20 Amp service mode is not automatically detected and the oper-
ator must manually select the 20 Amp mode when 20 Amp service is
available.
The service select button allows the current threshold to be set to
either 30 Amps or 20 Amps, to match the incoming service.
OM060082.eps
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