Hettich EBA 20 - Assembling and Disassembling Components; Replacing the Carbon Brushes; Motor M1; Rubber-metal bearing

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10 Assembling and disassembling components
Component Abbreviation Plug Connected
to board
Description
in section
Carbon brushes 10.1
Motor M1 ST1 A1 10.2
Rubber-metal bearing -- -- 10.2
Power board A1 -- -- 10.3
Control panel A3 -- -- 10.4
Flat ribbon cable A1 to A3 10.5
Lid lock Y1 ST4 A1 10.8
Mains switch Q1 -- A1 10.6
Appliance plug -- -- -- 10.6
Imbalance switch (only with EBA 20 C) S2 ST6 A1 10.7
Before assembling or disassembling components, the following working
processes must first be carried out to reach the components.
Make a note of the plug numbers !
The components are assembled in reverse order !
• Open the lid.
• Switch mains switch off (position 0).
• Disconnect the centrifuge from the mains.
• Remove the rotor.
• Remove the four fastening screws for the upper part on the bottom of the centrifuge.
Place the upper part carefully beside the centrifuge.
10.1 Replacing the carbon brushes
Always replace both carbon brushes at the same time!
• Lift pressure spring away from the carbon brush.
• Pull the carbon brush out of the holder.
• Remove carbon dust.
• Insert new carbon brush into the holder.
• Carefully place the pressure spring on the carbon brush.
10.2 Motor M1 / Rubber-metal bearing
• Pull off plugs ST1 and ST5 from the power board A1.
• Unscrew the fastening screw of the rubber-metal bearing at the lower part of the
housing.
• Lift the motor upwards out of the centrifuge and pull off the earth connection.
• Unscrew the rubber-metal bearing from the motor.