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ELECTRICAL
Load Status
Where the last Screen gave general information about
all the controlled Loads, these next two screens gives
detailed information about the status of each Load under
PCS control.
Water Heater OFF 11A, indicates that the Water Heater
power has been temporarily turned OFF, and the current
at the instant the Water Heater was turned off last was 11
amps.
Refrigerator ON 7A, indicates that the Refrigerator has
power. Again the 7amps of current is NOT the present
current draw, but rather the current at the instant the
Refrigerator was turned off last. A/C #2 ON, indicates that
the A/C #2 has power. Since there is no current displayed,
that only indicates that this load has not been turned OFF
even once since the Battery has been reconnected and
12V power applied to PCS. PCS has never had a chance
to “Learn” the current. The Current Displayed, is re-
learned each and every time that the Load is turned OFF.
Looking at the list, it appears that PCS does not turn off
Loads in Order Preference. PCS will always start shedding
loads from the top of the list when PCS in 30A or 20A
Service. However, in 50A Service, or running on the
Generator there are two Main Breaker, Line 1 & Line 2.
PCS will only shed loads if there is an overload detected
on its associated Line. In other words, if shedding the
Load will not help, skip it and move on. If then sometime
in the future an overload is detected on the other Line,
PCS will start at the top of the list again. The same is true
with Magnum Battery Charge Reduction and Inverter
Assist. Magnum can only help on the Line it is wired to, so
if it will not help to Assist, don’t bother.
Power Management
When the current exceeds the limit, because possibly
the owner has turned on the Microwave, the PCS will
independently limit the current on each line by performing
the following in order: Reduce Magnum Battery Charge
Rate, Inverter Assist, Load Shed. (If the Magnum Inverter is
wired to the opposite leg, only Load Shedding will occur.
As each appliance is shed, PCS learns the current for that
specific appliance, to ensure that there will be sufficient
headroom to turn the appliance back on and be under the
current limit. To ensure that Air Conditioner compressor
pressure is bled, and to reduce quick cycling, there is a 2
minute delay from the time a Load has been shed, to the
time power is restored.
Once the total RV current has dropped, for example
because an owner operated appliance has been
turned off, the PCS will reverse the above procedure,
returning power to appliances whose operation was not
immediately critical.
Source(s): Precision Circuits Power Control System 50A (Rev052207)
Product(s): Precision Circuit Energy Management System Remote
Display (Model: 00-10019-050, Newmar Part Number: 127558 )
WARNING, IF THE DISPLAY EVER INDICATES “Wiring
Status Error,” IMMEDIATELY, unplug the RV from the outlet,
and have the outlet inspected by a qualified technician.
The other lines on the Display to the right indicate proper
wiring for 50A Service. For 30A Service L1=L2.
Fuse Panels
This article provides information and the location of the house and chassis fuse panels.
Fuse Panels on Coaches Built on Ford Chassis
Inside The Coach
On a class A coach, the house fuse panel, which controls
most of the components and appliances inside the coach,
is located in the bathroom. This panel contains fuses and
breakers that are connected to all main appliances in the
coach, from the refrigerator and television to the lights in
the bedroom and slideouts.
There are also some external components that are fused in
the house fuse panel. For example, the fuses for the water
pump, water heater, awning, and basement storage lights
may be located in this panel.
The Ford chassis fuse panel is located on the sidewall,
left of the driver’s feet. This fuse panel supplies power
to exterior lights, the tow plug, and the wipers. For exact
details, see the Ford manual.
To access the Ford fuse panel on the passenger side
under the dash, rotate the clips on the sides of the cover
to release and remove the cover. To remove the black fuse
retainer, pinch the two tabs together, and pull out on the
retainer to gain access to the fuses. To replace the cover
when finished, install the retainer by aligning and pressing
in until the fuse retainer snaps in place. Install the cover,
and rotate the retainer clips to hold the cover in place.
Summary of Contents for Bay Star 2022
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