Unchanged Features; This Is Important; Terms Used In Battery Charging; Normal Charging - Multiplex Royal SX 9 Instructions Manual

!
Battery management only provides supple-
mentary information!
Battery charge and residual time represent additional
information relating to the condition of the transmitter
battery, and are intended to provide additional security
when handling the transmitter. However, major dis-
crepancies may occur due to production tolerances,
battery ageing and the effects of battery maintenance.
In any case the system only works properly if the ca-
pacity and battery charge quantity ( 8.4.3.a.) are set
correctly when the battery is initially charged.
8.4.2.

Unchanged features

Voltage display:
Virtually all modern transmitters display the actual bat-
tery voltage as a numerical value and / or in graphic
form (bar graph).
Battery alarm:
If the battery voltage falls below a certain minimum
value, the transmitter emits an audible alarm. On
many transmitters the alarm threshold is variable.
As you would expect, the ROYAL SX also includes
these two functions (Setting the alarm threshold
( 14.1.3.)).
8.4.3.

This is important

To ensure that the battery management function dis-
plays values which are as close to "the truth" as pos-
sible, it is essential to observe the following points:
a. Correcting the battery capacity
The battery management function assumes that
the transmitter is fitted with a battery of 2100 mAh
capacity. When the transmitter battery has been
conditioned (more than five charge / discharge cy-
cles) you can correct any discrepancy from the
nominal capacity as follows:
Menu: LSetup, Transmitter,
Parameter: Battery Capacity.
At this point you can set the value determined by
the battery charger (in increments of 50 mAh).
!
When the battery voltage falls below 6.5 V,
the available charge quantity is set to 0 mAh.
b. Correcting the available battery charge quantity
If you fit a new transmitter battery, or charge it di-
rectly (i.e. not via the socket on the back panel),
then the available battery charge quantity must be
corrected manually:
Menu: LSetup, Transmitter,
Parameter: Battery charge.
!
If the battery voltage is above 8.6 V when
the transmitter is switched on, the battery
charge quantity is set to the value which is set
for battery capacity in the menu ¡Setup,
Transmitter.
!
If the battery voltage falls below 6.5 V, the
available charge quantity is set to 0 mAh.
c. Charge the battery via the charge socket!
The battery management system can only
calculate the available charge quantity if you re-
charge the battery via the charge socket.
d. Normal charging at constant current (210 mA)
If you leave the battery connected to the charger
for longer than the period calculated according to
the formula in Section 8.5.1, the battery manage-
ment system still displays the charge quantity
which you have set as the capacity in the menu
¡Setup, Transmitter.
8.5.

Terms used in battery charging

Full capacity and potential performance ...
... are achieved by NiMH batteries only after several
charge / discharge cycles (~5 cycles). The initial charge /
discharge cycles should be carried out at 0.1 C (210
mA). Don't fast-charge the battery until you have first
conditioned the pack in this way.
Charging at 1 C ...
... feeds 100% of the battery's nominal capacity into
the pack in one hour in the form of charged-in energy.
For a battery of 2000 mAh capacity a current of
2000 mA is required to achieve this. If this current is
used for charging, we speak of a 1 C charge. This cur-
rent value is found by simply taking the nominal ca-
pacity in mAh (or Ah), and omitting the "h" (hours).

Normal charging ...

8.5.1.
... means that the battery is charged at a current
within the range 0.05 C and 0.2 C. For a 2000 mAh
pack, for example, this means a charge rate of 100
mA to 400 mA.
To ensure that a rechargeable battery really is fully
charged, it is necessary to feed more than 100% of its
nominal capacity into the pack. The amount of the ad-
ditional charge is defined by the charge factor.
The charge time for a flat battery is calculated as fol-
lows:
Capacity [mAh]
Charge time [h] = -------------------------------
Charge current [mA]
!
Note the charge factor for normal charging!
For PERMABATT+ type batteries of 2100 mAh the
charge factor is 1.6. Using a charge current of 210 mA
(1/10 C) a flat battery must therefore be charged for
sixteen hours if it is to be charged fully.

Fast charging ...

8.5.2.
... means that the battery is charged at a current in the
range 0.5 C to 1 C.
!
Observe the maximum charge current!
For PERMABATT+ type batteries of 2100 mAh the
maximum approved fast-charge current is 1.4 A.
In this case the charge time is determined by the fast-
charger's automatic cut-off circuit.
Manual
* charge factor
13