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8 Charging the transmitter battery
Charging the transmitter battery
Charging the transmitter battery
The rechargeable transmitter battery can be charged
via the charge socket fitted to the side of the case.
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 charge process
can cause the charge voltage to rise to the point where
the transmitter is immediately damaged by the excess
voltage. Alternatively the interruption may trigger a new
charge cycle, which means that the battery will possibly
be severely overcharged.
For this reason check carefully that all connectors
are secure, and making really good contact. Inter-
ruptions due to an intermittent contact, no matter
how brief, inevitably cause the charger to malfunc-
tion.
Polarity of the mx-12 charge socket
Commercially available battery charge leads produced
by other manufacturers are often made up with the op-
posite polarity. For this reason use genuine GRAUPNER
charge leads exclusively.
Charge current
To avoid damage to the transmitter the maximum charge
current should not exceed 500 mA (0.5 A) with the char-
ge circuit fuse out of circuit (not fitted); with the charge
circuit fuse in place: max. 1.5 A.
Notes on recharging transmitter batteries using an
automatic charger
· Observe the recommendations provided by the
charger manufacturer and the battery manufactu-
rer at all times.
· Carry out a series of test charges to ensure that
the automatic charge termination circuit works
correctly with your battery. This applies in parti-
cular if you are using an automatic charger desig-
ned for NiCd batteries to recharge the standard
NiMH battery. You may need to adjust the Delta-
Peak trigger voltage, if your charger provides this
option.
· The charge current must be set using the
charger’s „manual charge current select“ facility,
to ensure that the maximum charge current never
exceeds 1.5 A. Never allow the charger to set the
charge current automatically.
· Do not discharge the battery or carry out a
battery maintenance program via the integral
charge socket. The charge socket is not suitable
for this application.
· If you intend to charge the transmitter battery at
a current higher than 1.5 A, the battery must be
removed beforehand, otherwise the transmitter
could be damaged through overheating.
Standard chargers
Order-No. 6422 Minilader 2
Order-No. 6427 Multilader 3
Order-No. 6426 Multilader 6E*
Order-No. 6428 Turbomat 6 Plus*
Order-No. 6429 Turbomat 7 Plus*
Automatic chargers with special NiMH charge
programs
Order-No. 6419 Ultramat 5*, **
Order-No. 6410 Ultramat 10*
Order-No. 6412 Ultramat 12*, **
Order-No. 6417 Ultramat 25*, **
Order-No. 6416 Ultra Duo Plus 30*, **
* To recharge the mx-12 system you will also need the transmitter
charge lead, Order No. 3022, and the receiver battery charge lead,
Order No. 3021.
** 12 V power source required.
8


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