Wittenborg FB 5100 - Functioning of the Brewer

November, 1998
32
Dismounting/Repair Brewing SystemService Manual FB50/55/5100/5500
9.3.2Functioning of the Brewer
● The brewing process takes place by means
of the following steps:
- The actuator is switched on for direct
action by the control
- The actuator winds up
- After a few rotations of the spindle the
switch BAE (Brewer at end) is opened
- The actuator continues winding up
- Simultaneously, the scraper moves
forward, and the filter plate closes the
brewer cylinder
- The counterpressure of the brewer
cylinder prevents a further ascent of the
filter plate and the actuator
- Via the spindle, the forward movement
of the motor presses down the plunger
- When the pin on the plunge holder does
not operate the microswitch BC (Brewer
closed) any longer, the control stops the
actuator motor
- The dosing volume is controlled by
means of the tachopulses of the dosing
motor
- According to the set product quantity,
the control determines the number of
rotations of the dosing motor
- The dosing motor is driven
- The water flushes the coffee powder into
the brewer cylinder
Simultaneously to the coffee dosing hot
water flows from the boiler into the
mixing funnel
- After expiration of the set extraction time
of the brewer, the actuator motor
descends the plunger in the brewer
cylinder via the spindle
- The beverage is filtered through the filter
plate and delivered via the delivery
spout
- With correct settings, the brewer is
never filled completely
- The remaining air between the brewer
and the plunger serves to dry the coffee
grounds
- As soon as the guiding nut closes the
microswitch BAE, the actuator motor
stops
- The plunger is in the lower end position
- The control switches the actuator motor
to reverse motion
- The plunger ascends
- When the plunge holder reaches its
upper position, the pin on the plunge
holder operates the microswitch BC
(opener)
- The actuator motor continues the
reverse motion
- The brewer cylinder opens, and the
scraper is guided in such a way that the
dried coffee grounds as well as the filter
paper** are pushed into the coffee
grounds container
- Simultaneously, the filter paper** is
rolled off the paper roll and aligned into
position
- When the scraper is in its rear position,
the microswitch BAE is actuated
- The control stops the actuator motor
(according to dispenser type the start
positions can be different)
- The brewing process is completed
BAE = Brewer at end
BC = Brewer closed
**Optional for coffee filling