Coffee Cycle Operating Diagram - Gaggia Brera Service Manual

GAGGIA
4.3.

Coffee cycle operating diagram

Main
switch ON
Time
Coffee grinder
Heating
Pump
Gearmotor
Brew group
Status
Notes: * Only with Prebrewing
MS status
When the machine is switched on, the gearmotor repositions itself as follows:
- It acts on microswitch 1 (see following section)
- The gearmotor changes its rotation direction and moves upwards again by approx. 1-2 mm
- The boiler begins to heat water for approx. 45 seconds. It absorbs all the available heating
power in order to reach the optimal temperature. The temperature will then remain at a con-
stant level.
1. The coffee grinder starts the grinding process (controlled by pulses generated by a sensor)
2. The gearmotor (brew group) moves to the dispensing position
3. Preliminary dispensing phase (short pump activity, short pause)
4. Product dispensing (the pump operation period is defined by the amount of product dispensed)
5. The gearmotor moves to its home position (the dregs are expelled automatically).
Rev. 00 OCTOBER 2009
START
approx.
45 sec.
Heating Ready
OFF
Single microswitch gearmotor
Switching on
Coffee cycle
04 OPERATING LOGIC
Pulses
(Dosage)
*
Coffee cycle
ON
STOP
Pump activity
(turbine pulses)
depending on the
product quantity
selected
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