GRAUPNER MC-22S Programming Manual page 11

Polarity of the mc-22s charge socket
Commercially available battery charge leads pro-
duced by other manufacturers are often made up
with reversed polarity. For this reason use genuine
GRAUPNER charge leads exclusively.
Charging the transmitter battery using a standard
charger
The integral transmitter charge socket is fi tted with a
safety circuit which prevents reverse current fl ow. This
is designed to prevent damage to the transmitter if
the charge lead is connected with reverse polarity, or
if the bare ends of the lead short out.
This protective measure makes it impossible to re-
charge the transmitter battery using an automatic
charger, as the charger is unable to check and moni-
tor the battery voltage properly. Automatic chargers
usually respond to this by terminating the charge pro-
cess prematurely, throwing up error messages or re-
fusing completely to charge the pack.
The basic rule for charging a fl at battery with a stan-
dard charger (without automatic cut-off) is: charge
for fourteen hours at a current corresponding to one
tenth of the capacity printed on the pack. This is 300
mA for the transmitter battery fi tted as standard. It is
up to the user to terminate the charge at the correct
time ...
Charging the transmitter battery with an auto-
matic charger
By-passing the reverse fl ow safety circuit
If you wish to use an automatic charger to recharge
the transmitter battery, the reverse fl ow safety circuit
(protective diode) mentioned in the previous column
must be by-passed. This is done by fi tting a 20 mm
cartridge fuse (5 Amp, fast-acting) in the fuse holder.
If you by-pass the reverse fl ow safety circuit, the-
re is a constant danger of short-circuit between
the charge lead plugs. If a short-circuit or reverse
polarity occurs, the transmitter's charge circuit fuse
will immediately blow.
A blown fuse must always be replaced by a new
20 mm glass cartridge fuse (5A, fast-acting). Never
attempt to repair the fuse by by-passing it. Replace-
ment fuses are available in any electronics supply
shop.
Maximum charge current
To avoid damage to the transmitter the maximum
charge current should not exceed 500 mA (0.5 A)
with the charge circuit fuse out of circuit (not fi tted);
with the charge circuit fuse in place: max. 1.5 A.
Fuse, 5A, fast-acting Fuse, 5A, fast-acting
Removing the transmitter battery
To remove the transmitter battery,
carefully disconnect the plug from
the transmitter circuit board, pulling
the connector upwards by the cable.
Locate the rubber bands at the bat-
tery compartment and push them
to the side slightly. The battery can
then be slid out of the compartment
sideways.
Check the state of the batteries at regular intervals.
Don't wait to recharge the batteries until you notice
the servos working more slowly than usual.
On-screen battery operating hours display
St watch
#01 0:00h C73
Flighttm
H-J Sandbrunner
11.3V
0:00h
0 0 0
This timer shows the cumulative operating time of the
transmitter battery since the last time the battery was
recharged.
This timer is automatically reset to the value "0:00" as
soon as the transmitter circuit detects that the voltage
of the transmitter battery is signifi cantly higher than
last time, i.e. the pack has been recharged in the me-
antime.
Operating notes
red
brown or
black
Transmitter charge
plug polarity
:
0 00
:
0 00
0
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