Charging The Transmitter Battery (Fast Charging); Fast Chargers For Up To Eight Cells; Fast Chargers For More Than Eight Cells; Maintaining And Storing - Multiplex ROYALevo 7 Manual De Instrucciones

8.3. Charging the transmitter battery
(fast charging)
Fast charging is an alternative method of battery charg-
ing which is commonly employed in modelling today,
and is popular due to the reduced charge times. Fast
charging means that the battery is charged at a current
in the range 0.5 to 1 C. For a 1500 mAh battery this
means charge rates between 750 mA and 1.5 A. This
method of charging can present problems due to the
high currents, especially when charging a battery in a
radio control system transmitter, as the electronics are
liable to damage. That is why we generally recommend
the normal or 1/10 C method (
For fast charging please observe the following safety
notes:
!
Fast charging should only be carried out using a
charger with a suitable automatic termination circuit.
!
Time-controlled fast charging is not permissible!
!
Important when fast-charging NiMH batteries:
The charger must be designed for NiMH batteries!
(Delta Peak cut-off sensitivity < 5mV / cell)
!
Maximum charge current: 1.5 A!
Fast chargers must be set to manual current selection.
Don't use an automatic program! The power circuits in
the transmitter and battery are not designed for high
currents.
If a fast charger terminates the charge process prema-
turely, reduce the charge current and start again.
Notes:
Reflex chargers operate with pulses of very high current
which may damage the transmitter's electronics. If you
wish to use the reflex process, remove the battery from
the transmitter for charging.
Note that fast-charging reduces the life of the battery.
8.3.1. 12V fast chargers for up to eight cells
If you wish to use a fast charger capable of charging
only 8-cell packs (e.g. 4 - 8 cells), the battery can be left
in the transmitter. Connect the charger via the multi-
function socket on the transmitter. Use the transmitter
charge lead with banana plugs, # 8 6020.
8.3.2. 12V fast chargers for more than eight cells
In this case the transmitter battery must not be
charged via the charge socket. Disconnect the pack
from the transmitter's electronics and connect it to the
charger using the direct transmitter charge lead # 8
6021.
The battery management function of the ROYALevo (
8.5.) can only work properly if the electronics are
permanently connected to the battery (even when the
transmitter is switched off), and is able to measure the
currents which flow into the battery (charging) and out
of it (normal operation). Chargers designed for more
than eight cells usually incorporate voltage converters
which can generate high voltages. These excessive
voltages can damage the transmitter electronics.
8.2.).
Page 9
ROYAL evo 7 - Instructions
FAQs
Full capacity and performance
NiMH batteries only reach their full potential after sev-
eral charge / discharge cycles (~ 5 cycles). The first
charges should be made at the normal charge rate of
0.1 C (150 mA). You can then fast-charge the pack safely.
What does "C" mean in relation to charge currents?
C is the charge current at which the battery is fed 100%
of its nominal capacity when charged for one hour. For
the ROYALevo 's 1500 mAh battery this means a current
of 1500 mA. If this current is used for charging, we term
this a 1 C charge. This current value is simply the nomi-
nal capacity in mAh (or Ah), but with the "h" (hours) re-
moved.
Trickle charging
This term means that the battery is charged at a current
in the range 0.03 C to 0.05 C (45 to 75 mA). Many auto-
matic chargers switch to this mode at the end of a
charge process. The trickle charge should be terminated
after no longer than 20 hours.
8.4.

Maintaining and storing

the transmitter battery

The battery's effective capacity may be reduced if it is
stored for a long period without maintenance, or in the
wrong conditions. For this reason:
Always store NiMH batteries fully charged. This pre-
vents the pack becoming deep-discharged (deep dis-
charge = < 1.0 V / cell - always to be avoided).
Charge unused NiMH packs every three months. This
compensates for the self-discharge rate, and again
avoids deep-discharging.
Store NiMH packs at temperatures between 0°C and
30°C, in dry conditions, away from direct sunshine.
"Balance" the battery if it has been stored for a long
period (several charge / discharge cycles at a low
charge / discharge current: approx. 1/10 C).
8.5. The ROYALevo 's battery manage-
ment
8.5.1.

What we are used to:

Voltage display
Virtually all modern transmitters display the actual bat-
tery voltage as a numerical value and/or in graphic
form.
Battery alarm
If the battery voltage falls below a minimum value, the
transmitter emits an audible alarm. Many transmitters
offer a variable alarm threshold.
Naturally, the ROYALevo includes both these functions.
The alarm threshold can also be adjusted ( 13.1.2.).