Encoder; Fig.10 Water Selector Intern; Fig.11 Water Distribution Disc With Magnets; Fig.12 Bypass - BRAVILOR BONAMAT Aurora SINGLE LOW Operating Principle

The volume of moved liquid (output) is mainly determined by the time and speed of the pump
motor. The software controls the time that the motor is on and this is very precise. The rotational
speed of the motor is measured by an active revolution counter. Fig.9 shows that a disc has been
mounted on the shaft of the pump motor (A=Encoder). This disc rotates at the same speed as the
pump rotor. The encoder rotates between a light sensor (B) and interrupts a light beam each time.
The interruption of the light beam is converted into electronically readable pulses.
A
B
Fig.9 Encoder
This actively controls the rotational speed in order to guarantee that the rotational speed and
therefore the water output remains constant during the time that the pump motor is on.
Select the dosed hot water:
• This machine has a hot water selector (Fig.10).
• This part is responsible for distributing the dosed water from the boiler in 2 directions, through
the filter (for the coffee) or through the bypass (passing by the filter and the coffee).

Fig.11 Water distribution disc with magnets

After the machine has been switched on, the water selector will go to the home position following
the procedure below:
• The water selector motor is controlled.
• This motor drives the water distribution disc with a plastic worm (Fig.10).
• The water distribution disc has 3 magnets (Fig.11) 2 of which are close together. The hall
sensor detects all these magnets (Fig.5, C).
• The water distribution disc will always rotate min. 360 degrees to determine its position.
The position for dosing through the bypass during the start-up of the machine is the home
position (Fig.10).

Fig.10 Water selector intern

Fig.12 Bypass

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