GRAUPNER mx-12 Hott, Programming Manual

Page: 14 / 200

14 Operating Notes
Operating Notes
Transmitter power supply
The
mx-16
HoTT transmitter is fitted as standard with
a high-capacity rechargeable 4NH-2000 RX RTU NiMH
battery (Order No.
2498.4FBEC ) (specification re-
served). When delivered, the standard rechargeable
battery is not charged.
When you are using the transmitter you can monitor
the battery voltage on the LCD screen. If the voltage
of the transmitter battery falls below a certain voltage
(default 4.7 V), which can be set in the “Battery warning
threshold” line of the “
Basic settings
” menu, page 134,
you will hear an audible warning signal. The screen then
displays a message reminding you that the transmitter
battery needs to be recharged.
#01
0:22h
stop 0:00
0:00
0.0V
4.7 HoTT
M
x
batter y
needs
charging!!
x
Always recharge the transmitter battery in good time.
When you see this message, cease operations immedi-
ately and recharge the transmitter battery.
Note:
Ensure that the correct battery type is set in the “
Basic
settings
” menu on page 134!
NIMH must be set as the
standard value.
Charging the transmitter battery
The rechargeable NiMH transmitter battery can be
recharged with the battery charger (Order No.
33116.2
)
supplied in the set, using the charge socket located on
the right-hand side of the transmitter. Leave the battery
inside the transmitter for charging, to avoid premature
damage to the internal battery socket.
As an approximate guideline a discharged battery
should be charged for twelve hours at a current cor-
responding to one tenth of the capacity printed on the
pack. If you are using the standard transmitter battery
and the charger supplied in the set, this current is
200 mA.
The transmitter must be switched “OFF” for the whole
period of the charge process. Never switch on the
transmitter when it is still connected to the charger; even
a very brief interruption in the process can cause the
charge voltage to rise to the point where the transmitter
is immediately damaged. For this reason check carefully
that all connectors are secure, and are making really
good contact.
Polarity of the mx-16 HoTT charge socket
Commercially available battery charge leads produced
by other manufacturers are often made up with the op-
posite polarity. For this reason it is essential to use only
the genuine
Graupner charge lead, Order No. 3022 .
Using automatic battery chargers
As standard the charge socket is protected against
short-circuit by a diode. However, genuine Graupner
automatic battery chargers are still able to detect the
voltage of the battery. The maximum charge current
must not exceed 1 A, otherwise the diode and possibly
other components may be damaged.
If possible, set the delta peak voltage difference of your
fast charger to a value in the range 10 mV … 20 mV or
equivalent, as described in the charger’s instructions;
this ensures that it is suitable for fast-charging NiMH
cells.
First connect the banana plugs on the charge lead
to the charger, and only then connect the other end
of the charge lead to the charge socket on the trans-
mitter. When the charge lead is connected to the
transmitter, never allow the bare ends of the plugs to
touch! To avoid damage to the transmitter, the charge
current must never exceed 1 A. If necessary, limit the
current on the charger itself.
Removing the transmitter battery
To remove the transmitter battery, first disengage the
cover over the battery compartment on the back of the
transmitter, then lift it off:
Remove the battery, then carefully pull on the power
lead to disconnect the transmitter battery connector.
Installing the transmitter battery
Hold the connector attached to the transmitter battery
in such a way that the black or brown
wire faces the aerial, and the unused
socket of the battery connector is on
the side facing the bottom, then push
the battery connector onto the three
pins projecting out of the inside of the
Polarity of
transmitter battery
connector