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Fagor IF-9000-S-MATRIX Manual

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MATRIX INDUCTION
Technical Training
OPERATION
- 22 -
CU3A5
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MATRIX
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001
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7.3. - Filtering
The mechanism can generate a large amount of high frequency interference. To ensure a minimum
level of interference, a large filtering device is used. It enables induction hobs to become
environmentally-friendly devices whose level of interference is lower than that of a television set.
The MATRIX hob filter is a board found at the supply inlet. This filter board carries out several tasks
and its components are adapted in relation to their task:
They protect against operational over-intensity
They eliminate incoming and outgoing interference
They eliminate power surges (voltage peaks)
They authorise the supply to the generators and are controlled by the control board.
For this, the same components are nearly always used: Filter capacitors, fuse(s), VDR, high
inductance induction coil, control relay and an essential earth connection.
The VDRs (Voltage Dependent Resistor) become busy at 275 or 420 Volts (depending on the
model) and protect against overvoltage of components that are situated on the same supply.
The fuse preventing excess currents works using a restrictor on the board track (fuse track).
There are actually two 16A series fuses.
The induction coils act as “buffers”, only allowing low frequencies through. Their action is
supplemented by the capacitors whose value changes in relation to the assembly.
The earth connection made by a screw and a combination of capacitors, helps to remove the
“residual” high frequency interference.
The filter retaining screw has a vital role. It is essential that it is
replaced when work is carried out.
… 22 …


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