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ZONE 3
WARNING : THIS ZONE IS AT MAINS VOLTAGE
This zone, isolated from the microprocessor part by opto-couplers, is the electronic part related
to the power in the system. This zone includes :
- The 15 VDC power supply for the control electronics for this zone.
- The control circuit of the 6 basic signals of the IGBT module.
- The 3 PWM commands coming from the microcontroller.
- The command of activation of the module of power coming from the micro-controller.
- The brake GBT with the command which permits flow through the braking resistor.
- The diode bridge which, from the mains, charge the capacitor of the continuous bus.
- The relay which, controlled by the supply of power, then short circuits the resistance of the
charge of the capacitors of the continuous bus a few moments after switch-on.
- The module of 6 IGBTs and its heat sink which power the motor.
2.4.3. IMBALANCE SENSOR
As described in the introduction, this sensor allows the detection of an excessive imbalance in
the rotor loading.
The device amplifies vibrations due to the imbalance and generates a signal beyond a preset
threshold.
After shaping, this signal is sent to the microprocessor for the safety devices.
2.4.4. TACHO SENSOR
The tacho sensor is comprised of an optical sensor, which generates two pulses per revolution.
2.4.5. TEMPERATURE SENSOR (RT3)
The sensor is a double thermistor. It delivers a signal proportional to the temperature.
2.4.6. REFRIGERATION CONTROL BOARD (RT3)
The board controls the power signal to the refrigeration group.
Service Manual 11290099
page 16 of 44
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