Saeco ODEA, Service Manual

Page: 33 / 99

Page 6 / 14 Saeco Internationa Group
04 FUNCTIONAL PRINCIPLES TALEA / ODEA - LINE
With 2 microswitches
The gear is powered by a direct current motor
that engages in the smaller double toothed
gear using the worm gear drive. The brewing
unit is placed on the axis between the large
geared tooth and is moved by the change in
direction of the motor between the home and
brewing positions.
The end positions are monitored by the
switching pins and the corrisponding
microswitches.
Home position: MS1 / Pin 1
Brewing position: MS2 / Pin 2
When moving to the home position, pin 1
activates the MS1, the motor changes the
direction of rotation and the pin disactivates the
MS1.
The pin is positioned 2 mm away from the
switching point in its home position.
1
2
MS1
MS2
4.5. Brewing unit’s gear mechanism
Temperature sensor
An NTC is used as the temperature sensor:
If the NTC senses too high temperatures,
electronics decreases boiler’s temperature that
is controlled by the resistance’s voltage.
Resistance values and the corrisponding
temperatures:
see table
4.6. Temperature sensor (control)
Single micro
The function is the same as with 2 micros-
witches. However, here a toothed gear with
continuous pin is used and a single micros-
witch takes over the monitoring of both end
positions.
Important: during the movement between the
brewing and home position, the microswitch
is not activated (does not move onto the pin),
but both ends of the pin switch the micros-
witch in their fi nal positions.
Home position: Pin 1
Brewing position: Pin 2
MS
1
2
T (°C) R (kΩ) ΔR (+/- %)
20 61.465 8.6
50 17.599 5.9
75 7.214 4.1
80 6.121 3.7
85 5.213 3.4
90 4.459 3.1
100 3.3 2.5
125 1.653 3.9
150 0.893 5.1