78 Hardware installation
Thus the RPM Governor of MICROBEAST PLUS can be used, the system must be able
to detect the motor speed. This is done with the help of a rpm sensor that must be
attached to the sensor input of MICROBEAST PLUS. For models with nitro/gas engines
usually sensors are used that determine the speed signal magnetically or optically. These
sensors are mounted next to the crankshaft or clutch bell and register the number of engine
revolutions here. For electric motors the motor speed can be determined electronically.
For this purpose a phase sensor (e.g. BXA76013) is connected to one or two of the motor
phases. Some electric speed controllers also offer a direct signal output for the rpm signal,
so that no additional sensor is required.
To see how the sensor is mounted in detail please refer to the instruction manual from the
sensor or from the helicopter. The wire with the rpm signal is connected to sensor input pin
at the sideport of MICROBEAST PLUS by using the optional adapter cable BXA76401.
This sideboard also powers the sensor with the supply voltage, if necessary. Note that the
height of the supply voltage corresponds to your receiver power supply voltage!
Here are some installation and connection examples. As described virtually all kinds of rpm
sensors may be used. Unfortunately it is impossible to try and enumerate all types. If in
doubt about whether a particular sensor can be used in conjunction with MICROBEAST
PLUS ask your dealer to find out.
78.1 Electric drive system with external phase sensor
Connect the motor wires of the phase sensor with any two phases of the electric motor. It is
recommended to solder those wires to the plugs of the speed controller. So for maintenance
purposes it is easier to remove the motor from the model later. In some cases the use of
only one phase wire is sufficient. Usually this is the case when the speed controller powers
the system with a BEC thus there is no galvanic isolation between motor and receiver
circuit. However, we recommend using both wires in any case! This ensures that the sensor
provides an interference-free signal as possible.
The electronic speed controller is plugged into the [CH5] output.
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