Electrics
67
POWER SUPPLY UNITS
NE143RM, NE2006-CWS,
NE143-CF & NE2006-CWSF
The NE family of power supply units control
230v AC power, provide 12v DC output, and
dependant on model, provide control and
fusing of 12v DC circuits.
Common to all derivatives are the following
features:
Mains 230v AC – Mains Module with earth
leakage protection and over current
protection.
The NE family of power supply units are
designed to operate on a mains supply of
207 – 253v AC (for use with low continental
voltages). The 40 amp RCD gives protection
against earth faults and also acts as the
main switch. The mains module then has
three MCB’s, the ratings of which are
appropriate to the appliances and circuits
within the caravan.
For details of the circuits linked to each
MCB, please refer to the label positioned
close to the NE unit. Each MCB carries an
indication of its nominal current rating, and a
table on page 59 of this handbook gives
details of the loadings for each appliance. It
may not be possible to operate
simultaneously all appliances linked to an
MCB, please also consider the total current
loading relative to the 230v AC supply
available to the caravan.
12v DC - Totally automatic charger, with over
current protection, short circuit protection
and over temperature protection
The NE family of power supply units employ
a fully automatic 12v DC charger, which can
operate with a wide range of 230v AC input
voltages, and provides a stable output
voltage even under load. The unit can
provide up to 18amp (@12v) maximum and
16 amp continuously.
The battery charger uses and algorithm
which makes it possible to significantly
reduce charging time and avoid permanent
damage to batteries. It starts charging at
maximum current until the battery reaches a
voltage of 14.4v, then charging takes place
at a constant voltage of 13.8v. In this state
the recharge current gradually decreases
and the battery can be left permanently
connected to the charger without causing it
any damage.
The battery charger is fitted with circuitry
which will protect it in the event of electrical
or thermal overload. Should the current draw
exceed the rated output of the unit, then it
will begin shutting down. This will probably
be noticed as dimming of the 12v lighting.
On removal of the excessive load the
charger will automatically recover. To protect
against overheating there is an electronic
thermal protection circuit, which will operate
should the temperature of the unit rise above
a safe level. If this happens then the output
will shut off until the temperature has
dropped back to a safe level.
NE143-RM
In addition to the mains module three
illuminated switches are present on the front
of the NE143-RM.
SPACE HEATER
This switch can be used to isolate power to
the 230v element on the Truma space heater.
This is in addition to the selection of ‘OFF’,
‘500w’, ‘1000w’ or ‘2000w’ on the space
heater’s own control module.
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