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The
Rserve
Battery
$ctem
Tn
ns m itf-r; r c o
ntrc I testrhgl
The
Reserve Battery System
Many car drivers,
despite
having a large lueltank and
an
accurate
fuel
gauge,
carry
a reserve fuel can
in their car:
getting
stuck
with an empty tank
is
unpleasant,
and can
be dangerous.
lf
your
transmitter
"runs
out of
juice"
while
you
are
using it, then that
is rather worse than
unpleasant:
it usually
means the loss of the
model, not
to mention other
dangers.
The
reserve battery is a
form of safety net to
guard
against such
nasty surprises.
lt
gives you
a solid
reserve
operatrng
period
of about
15 minutes.
That is
enough
to
get
any model safely
onto the
ground
in one
piece.
How
it works
The reserve
battery is automatically
charged up
when-
ever
the main battery
is recharged,
through a special
electronic
circuit.
lt
cannot
be overcharged.
ln fact,
you
never need to
think about it at all under
normal circum-
stances.
lf the
voltage of
your
main transmitter battery
falls to the danger
point
and
the
audible
monitor signal
sounds,
then
you
can select
your
"utterly
certainf'
safety
system,
by manually switching
to the
reserve battery.
We
chose
this method of switching
deliberately.
The monitor
lamo will
flash for all the time the transmitter
is switched
to the
reserve battery. Because
of the flashing
lamp
you
are
bound to be aware
that the transmitter
is being sup-
plied
from the
reserve battery
if
you
switch on again
later. tor examole.
Charge
current
and charge
period
The automatic
charge circuit
for the
reserve battery
bleeds
oft a current
of about 30
mA from the charge cur-
rent
which is supplied
to the transmitter.
As most charg-
ers oroduce
a constant
current,
the main transmitter
bat-
tery
is
deprived
ot
that 30 mA, and
you
should therefore
charge
for
longer than
normal. The charge
period
should
always
be calculated
from the residual current
which is
fed to the main battery.
Here is an example:
Current
from charger
=
200 mA
Charge
period
increases by 30/200
=
0.15
=
150/0
lf
you
have a charger
with switchable or
selectable cur-
rent ranges,
you
can, of course,
increase the charge
rate
by about
30mA, and
your
normal charge
period
will be
unchanged.
Rapid-charging
The reserve
battery is always
charged at
the
"normal"
current,
i.e. at the
14-hour rate
-
even
if
you
rapid-
charge
the
main battery.
lf
you
slow-charge
the main
battery
in the normal
way, then the
reserve battery
will
always
be
fully charged.
However, if
you
usually
use a
rapid-charging
technique,
it may happen
that the charge
period
is not sufficient
to compensate
for the self-dis-
charge
tendency
oJ the reserve
battery.
This is more
likely at
high temperalures,
or if
you
do
not use the sys-
tem
for a considerable
time. For this
reason always
give
a slow
charge every
10th cycle
-
which
you
ought
to do
in any case
for other
reasons.
lf
you
have cause to use
the reserve
battery,
you
must slow-charge
the battery at
least
once before
using it again
lnstallation
Switch
the transmitter
oft, then open
the back and
place
it inverted on
the workbench.
The next step
is
to
withdraw the
battery cradle
Jrom the transmitter
case,
which is
now tacing
you.
Pull it upwards caretully,
holding
it
at both
ends
(see
Fig. 42).
Place the
reserve
battery
unit in the bottom
right-hand
corner,
over the
mounting eyes
provided
for it, and
retain it with the
4
screws
and eyelets supplied
(Fig.
43). Caution
-
make
sure
the eyelets are
the right way
round
(Fig.
44).
To
do
this,
please
refer to Fig.
46. First
pull
out the
bridging
plug
adjacent
to the
RF module; it is
no longer
needed.
A ribbon cable
is
supplied
in the set:
insert
one
ot the two
plugs
(either
will do) on
the ribbon cable
into the
vacant socket.
Now
bend
the ribbon cable
as
shown
in Fig. 47 and deploy
it as shown.
Insert the
plug
into the socket
on the reserve battery
unit.
It is not
possible
to connect this
with reversed
polarity,
but
please
refer to Fig. 47 in any case.
Fig.44
Fig.45
Select one
of the switch bays
(we
recommend bay
10),
cut away one
of the holes completely
and
install the
change-over
switch. Deploy the
connecting cable
lrom
the switch
to the battery as
shown in
Fig. 45. Take care
here, to avoid damaging
or
jamming
any ot the wires.
Once
you
have checked that
the wires are deployed
exactly
as shown
in Fig. 45, especially
where they run
around
the main battery,
and that
they cannot
get
tan-
gled,
replace the cradle
and
main battery
(the
lugs in
the
cradle must be connected
to
the mounting eyes
in
the casing).
Now
you
have to complete the
connection between
the
reserve
battery unit and the
transmitter electronics.
Fig.
42 Fig.43
Fig.45
Fig.46
Fig.
47
oc
67


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