Holiday 2002 NEPTUNE, Owner'S Manual

Page: 235 / 344

Electrical Systems - House
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2 0 0 2 N E P T U N E
8 • 235
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 man-
agement systems. One of these rules requires that if any energy man-
agement system is used, the average total load current for the system
over a three 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 three-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 dis-
play panel will illuminate.
Display Panel:
Six power status LEDs indicate that
power is applied to those loads. These
LEDs are on when the power is applied.
The load meter has a two digit display
to indicate the amount of current actual-
ly being drawn by all the appliances in
the motorhome.
NOTE: The load meter is
non-functional when con-
nected to 50 Amp shore serv-
ice.
Four service type LEDs indicate the source for 120/240 Volt AC power.
Three of these sources are automatically detected and indicated by the EMS:
Generator Service, 50 Amp Service and 30 Amp Service.
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 service select button allows the current threshold to be set to either 30
Amps or 20 Amps to match the incoming service.
With 50 Amp Input.
OM060082B