Working Principle - DeLonghi MAGNIFICA EVO Service Manual

4. WORKING PRINCIPLE

4.1. MICROSWITCHES, SENSORS AND SOLENOID VALVES
MICROSWITCHES
M1 = UPPER MICROSWITCH
M2 = LOWER MICROSWITCH
M3 = DRAWER MICROSWITCH
M4 = WATER TANK
MICROSWITCH
M5 = IFD CONNECTOR
MICROSWITCH
M6 = MILK JUG LID
MICROSWITCH
M7 = HOT WATER SPOUT
MICROSWITCH
REED AND ENCODER
REED SENSOR LOW WATER
TANK
HALL SENSOR ENCODER
MILK PRESENCE OPTICAL
SENSOR
SOLENOID VALVE
EV1 SOLENOID VALVE
[6]
Function
Detects when the infuser is on top
position
Detects when the infuser is on down
position
Detects when the drip tray is in
correct position
Detects the presence of the water
tank
Detects when the IFD connector is
attached to the machine
Detects when the milk jug lid is
attached to the machine
Detects when the hot water spout is
attached to the machine
Function
Detects when the water level is at
minimum
Detects rotations of transmission
motor
Detects when the milk jug contains
milk and when it is empty
Function
3-Ways solenoid valve
Doc. Nr.: DSDL_21008_A
Logic
"NC", it opens when the infuser is in top
position
"NO", it closes when the infuser is in down
position
Changeover micro switch. When the drip
tray is inserted:
- the contact for the drip tray
detection is OPEN;
- the contact for the transmission
motor power supply is CLOSED.
Changeover micro switch. When the water
tank is inserted:
- the contact for the water tank
detection is OPEN;
- the contact for the transmission
motor power supply is CLOSED.
"NO", it closes when the IFD connector is
attached.
"NO", it closes when the milk jug lid is
attached.
"NO", it closes when the hot water spout is
attached.
Logic
- When the jug is connected and
contains milk, the milk presence
blocks the
generated by the sensor and the
machine enables
recipes preparation.
- When the jug is connected but it
is empty, the infrared beam
generated by the sensor is free to
pass and the machine disables
the milk recipes preparation. In
this case only the milk jug
cleaning function is active.
Logic
It opens to deliver hot water through the
hot water spout and steam to the milk jug
for milk frothing. When it closes, it allows
the discharge of the residual pressure to
the expansion chamber and drip tray.
infrared beam
the milk