Virtual Sensors Description And Operation - Indesit FDEF31111 Service Information

Indesit Company

VIRTUAL SENSORS Description and Operation

Basic Description:.
The traditional pressure switch has been replaced by a system of "Virtual
Sensors" that will detect the presence or absence of water in the tub.
In practice, these sensors are the BLAC Wash Pump and the BLAC Drain
Pump.
The Virtual Sensors are able to detect full or empty conditions by
monitoring the operation of the BLAC wash pump and the BLAC drain
pump: By measuring the effort (energy consumption) expended power by
these motors, the Main Module can identify the exact operating situation.
See Tables below.
WASH PUMP
0 Empty Sensor
1 Full Sensor to Wash
2 Full Sensor to activate Heating Element
3 Dirty Filters/Foam (unsuitable situation)
4 Washing Pump Stopped
5 Speed Reduction
6 State Transition
Virtual Sensor (BLAC WASH PUMP) Sensing Blocked Filter
If, during the wash cycle, the Wash Pump (functioning as Virtual Sensor) senses a Clogged Filters/
Suds situation, the main board will reduce the motor rpm by 20%.
If the situation stabilizes, the problem will be identified as "Suds" and the pump continues operating
at the new speed.
If the pump continues to struggle (condition 3: build-up of suds or filters clogged),
the speed will be reduced by a further 20% and the problem identified as "Clogged Filters". If the
situation stabilizes, the pump will continue operating at the new speed.
If the problem persists, the machine will begin to top up with water until there are
5.5 litres in the tub or until the problem is overcome (whichever occurs first).
If the problem still persists (even after 5.5 litres of water have entered), the machine
will drain and the program skips to the next step of the cycle.
Drain Pump
The new Drain Pump has a BLAC motor.
The speed of this pump is controlled by the Power Module in
response to the different conditions prevailing at any given moment.
The BLAC Drain Pump's main function is to drain water from the
machine.
In addition, the BLAC drain pump (in combination with the BLAC
Wash Pump) operate as a virtual sensors.
Anti Flood Device
Consisting of a polystyrene float and microswitch. An excess of water
in the base operates the float switch sending a signal to the control
module operating the drain pump and displaying a fault code on the console.
Service Manual UK
DRAIN PUMP
0 Empty Sensor
1 -
2 Full Sensor
3 -
4 Drain Pump Stopped
5 -
6 State Transition
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