Philips Saeco Exprelia Series, Service Manual

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EXPRELIA 04 OPERATING LOGIC
Saeco International Group Rev. 00 / June 2010 Page / 11
Notes: * Only with Pre-brewing
4.4. Coffee cycle
Switching on
When the machine is switched on, the gearmotor repositions itself as follows:
- It acts on microswitch 1 (see following chapter)
- The gearmotor changes its rotation direction and moves upwards again by approx. 1-2 mm
- The boiler begins to heat the water for approx. 45 sec., at full power, in order to reach the
optimal temperature. The temperature will then remain at a constant level.
Coffee cycle
The coffee grinder starts the grinding process (controlled by pulses generated by a sensor) 1.
The gearmotor (brewing unit) moves to the dispensing position 2.
Preliminary dispensing phase (short pump activity, short pause) 3.
Product dispensing (the pump operation period is de fi ned by the amount of product dispensed) 4.
The gearmotor moves to its home position (the dregs are expelled automatically) 5.
Main
switch ON
START STOP
Time
Coffee grinder
Heating
Pump
Gearmotor:
Brewing unit
Status Heating Ready Coffee cycle
Pulses
(Dosage)
Pump activity
(turbine pulses)
depending on the
product quantity
selected
approx.
45 sec.
*
05
OFF
Single microswitch gearmotor
ON
Status
Microswitch