JETI model Max BEC 2D User Manual

1. Introduction

The Max BEC 2D is a linear voltage regulator, to provide power for the receiver and servos used

in your models. For increased safety and reliability of this device, a magnetic switch is used to

switch the unit on and off. The Max BEC 2D is fully compatible with the Jeti Duplex System and

can also be operated using the Jeti Box terminal.

To provide power to the BEC, a 2-cell LiPo/LiIon battery can be used or a 5 to 6-cell NiMh/NiCd

battery pack. The voltage regulator supplies a constant voltage to your receiver and servos,

providing smooth servo motion regardless of the discharge state of batteries. For maximum

reliability, two battery packs can be used to provide power and the BEC features two LED's,

indicating the connection state of the the connected packs.

The MAXBEC2D can be monitored and configured via the Jeti Box, either by direct connection, or

wirelessly using the Jeti Duplex system. This allows the input voltage, temperature and output

voltage to be monitored but also, the output voltage can be configured and alarms can be set for

input voltage and temperature as required.

The system uses the 2.4GHz band to communicate, which allows not only data transmission, but

also the receiving of data back from the system. During operation, telemetry data allows the

condition of the system and any measured values to be displayed on the Jeti Box. Switching the

BEC on and off is performed via the special magnetic switch and key, which simply needs to

make contact with the face-plate in the correct orientation for a short period of time to switch the

unit on or off.

2. Description

2.1 MAXBEC2D

The supply batteries are connected to the MAXBEC2D via the two pairs of 1.5mm2 wires. These

wires do not have a plug fitted.

The stabilised ouput power is delivered via one pair of 1.5mm2 wires with an MPX type plug

already fitted for your convenience. The output voltage may be adjusted by using the jumper next

to the output wires. For programming and monitoring the unit can be connected either to the data

socket of your Duplex receiver, or directly to your Jeti Box. Connecting the MAXBEC2D to your

Jeti Box does not require that a separate power-supply is connected to the Jeti Box, if the BEC is

switched-on.

2.2 Magnetic Switch

The magnetic switch is used to switch the BEC on or off. The switch consists of a switch-plate,

which receives the magnetic key and also the magnetic key itself.

The switch-plate is connected to the BEC by a three-wire cable and features two LED's. The

green LED indicates that the BEC is active. The Red LED indicates a warning condition.

If the green LED is blinking, this indicates that the magnetic key is present, but the unit is not

switched on.

If the green LED is continuously active, this indicates that the BEC is active and ready to power

your receiver and servos.

If the red LED is continuously active, this indicates that the input voltage is below the preset

threshold. (This LED has the same function as the Warning LED on the main unit)

3. Circuits

3.1 Powering the Max BEC 2D

The Max BEC 2D can be powered by up to two batteries. These can vary by cell-count and

chemistry and the BEC will always take power from the battery with the highest voltage. If both

batteries have the same voltage, then the BEC will take power from both batteries together. LED

Batt. A and/or LED Batt. B will indicate which battery the power is being drawn from. This can

also be determined from the Jeti Box.

If only one battery is to be used, it can be connected to battery input A or input B.

To connect your device(s) to the BEC, either solder your wires (Please use wire of at least 1mm2

diameter or larger, depending on your anticipated load) to the MPX output connector of the BEC

or use the Jeti MPX/3xJR cable, available separately. The Duplex EPC receivers, such as the R6

EPC, R8 EPC, R12, R14 and R18 are already fitted with a compatible MPX plug.

3.2 Communication with the Max BEC 2D

3.2.1 Connecting to the Jeti Box

Connect the BEC to the Jeti Box using the red JR connector from the BEC. Plug this into the

appropriate socket of the Jeti Box (The socket marked signal, +, -).

Connect the power-supply battery to the BEC and switch-on the BEC using the magnetic switch.

For this setup, there is no need to connect a supply battery to the Jeti Box as it will be powered

by the BEC. There is no wireless data transfer in this scenario.

Please note that in this configuration, no alarms will be generated because these rely on the

wireless data transfer and acoustic alarm of your Duplex transmitter module.

3.2.2 Connecting the BEC to a Duplex Receiver

Connect the BEC to the receiver using the red JR connector from the BEC. Plug this into the

socket marked 'Ext.' on the Duplex receiver.

Connect the supply battery to the BEC, not forgetting to connect the power output of the BEC to

your receiver!

Now the Jeti Box can be connected to your transmitter module for programming and monitoring of

the system. Switch on your transmitter and then use the magnetic key to switch-on the BEC.

3.2.3 Connecting the BEC to a Duplex Expander

Connect the BEC to the Expander using the red JR connector from the BEC. Plug this into any of