Philips 4000 - Coffee Grinder Philips 3000 and 120 V; Low Bean Level Detection, Dose Quantity Adjustment, Coffee

PHILIPS 4000 and 3000 04 OPERATING LOGIC
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4.5.1. Coffee grinder Philips 3000 and 120V
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4.5.2. Low bean level detection, dose quantity adjustment, coffee grinder
blocked
Withoutbeansn=100%
Withbeansn=100%
Withoutbeansn=50%
Withbeansn=50%
The coffee grinder is driven by a direct current motor (1) using a worm screw helicoidal wheel
transmission (2).
Thewormscrew(2)drivesaplasticgearwheel(3),whichturnsthelowergrinder(4)andthe
increment pin (5)
There are two magnets (6) in the gear wheel; at every rotation these induce two pulses to a Hall
sensor,whichinturntransmitsthemtotheelectronicsystem.
No coffee
AlowcoffeebeanlevelisdetectedbytheHallsensor,
after variations in the pulse frequency (with or without
coffee).
Iftherearenocoffeebeans(operationwhileempty),
the number of rotations – and therefore the number of
pulses – will be greater.
t1 = no coffee indication
If,however,therearecoffeebeans,thenumberof
rotations will be lower due to the force created by the
grinding.
t2 = no indication
t3 and t4 = this measurement is performed at the end
of each grinding process
Dose quantity adjustment
The dose quantity is adjusted in accordance with the
pulses detected (number of rotations proportional to the
selectedavor–mild,mediumorstrong).
Coffeegrinderblockage
Ifthecoffeegrinderbecomesblockedforanyreason,
pulses will no longer be transmitted to the electronic
system and the grinder will come to a stop.