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TALKING ABOUT BEC SYSTEMS
Many controllers on the market are equipped with a linear Bec circuit (Battery Eliminator Circuit). This type of regulator can power the entire
reception (receiver and servos) installed on the model from the propulsion battery. Thus, it becomes unnecessary to use a separate receiver
battery.
This mode of operation, however, presents limitations that must not be exceeded.
Thus, a conventional linear BEC operates satisfactorily if the number of servos used is reduced (4 at most) and if the battery voltage does not
exceed 10 V or 3 LiPo.
Above 3S LiPo, this type of controller becomes very hot, and can even get pre‐emptively in self‐protection mode, thus interrupting suddenly the
receiver power supply. You probably imagine the catastrophe that produces such a phenomenon! The loss of control inevitably leads to the crash
of the model, with important consequences in terms of safety and financial loss.
Controllers of high power (typically from 40 A) does not include BEC and can be of Opto type. In other words, they do not have this built‐in linear
BEC regulator function.
This choice is dictated by the fact that a model that requires a motor current of 40 A is necessarily a model of respectable size, and it therefore
requires a radio power supply both very reliable and powerful. It is not uncommon today motorized models with up to 8 servos with an electric
motor...
For this type of model, equipped with this type of controllers, two solutions are possible:
‐ Use a classical RX battery in addition to the propulsion battery.
‐ Use a U‐BEC PROTRONIK.
The first approach is conventional and reliable (provided the battery is in good condition), it strikes considerably the total weight of the model, and
requires a specific location in the fuselage. In addition, two batteries must be charged before flying.
That leaves the second alternative. This is precisely the one you selected by choosing to use a U‐BEC PROTRONIK module.
GENERAL FEATURES OF THE U-BEC PROTRONIK
Your new generation U‐BEC PROTRONIK is fully protected against short circuits on its output. Thus, in case of a short circuit or excessive
consumption during the flight, the IFR system (Intelligent Fast Recovery) UBEC goes in Auto Protect and reduces the output voltage. This module
avoids overheating and total discharge of the propulsion battery.
When consumption drops below the rated current, output voltage instantly finds back its nominal value. The receiver and servos are operating
normally again, contrary to what occurs with a UBEC circuit without IFR. This protection remains in effect until its temperature begins to decrease,
causing the crash of the model systematically.
Your U‐BEC 4A PROTRONIK has a fixed output voltage of 5.6 V compatible with virtually all servos and accessories on the market (12V version
is itself compatible with accessories in need of such supply voltage).
without taking any risk of overheating or premature wear. This compatibility is checked for both last generation digital servos than for older analog
servos, as well as for platforms 2 and 3 Brushless axes (Version 12 V).
It is nevertheless imperative that you verify that your servos / accessories are indeed compatible with voltage issued from your U‐BEC.
Your U‐BEC 5A PROTRONIK has an output voltage selector, allowing you to choose the voltage of your reception. If your servos are
compatible, you can feed them at 6 V (jumper removed) and benefit from a power and an optimal speed. You can also use this voltage of 6 V if
your model uses a dual feed introducing a voltage drop like the PROTRONIK accessories (check the instructions of the relevant accessory) to have
an optimum supply voltage.
If your servos you require a 5 V supply, install the jumper.
Your U‐BEC PROTRONIK is designed to meet the current calls generated by the servos / accessories during a flight. Thus, a brief inrush current
exceeding 20% of the nominal value does not trigger the IFR system.
The continuous current that can deliver your U‐BEC 4 A PROTRONIK depends upon its supply voltage. The following table shows the current
value based on number of elements that make up the LiPo battery pack.
It is imperative to respect this limit in order to avoid any interruption of your reception power supply.
The continuous current that can deliver your U‐BEC 4 A PROTRONIK also depends on its temperature and thus room temperature. If too much
elevation of the module temperature, temperature protection is activated and slowly reduces the output voltage to prevent its destruction. When
used in a hot environment, the persistent current must be reduced to 3 A.
The output voltage of the U‐BEC module remains extremely stable regardless of the receiver consumption and the propulsion battery
voltage. Power and speed of the servos / accessories are constant during the entire flight (see chart at end of document). To avoid any drop in
output voltage, you should always ensure that the supply voltage remains above 8 V (UBEC 5,6V) or 15V (UBEC 12V) in all circumstances.
PERMANENT CURRENT CAPACITY U-BEC 4A PROTRONIK
BATTERy LIPO
Input voltage
Permanent current
It brings out the best performances these, both in the power and the speed,
2S
3S
7 V
10,5 V
14 V
4 A
4 A
3,8 A
4S
5S
17,5 V
22 V
3,5 A
3 A
7
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