Lumio service manual
83
FINAL INSPECTIONS
Safety instructions
Protective earthing (PE) resistance test
This test makes sure that
- the protective earth conductor is not interrupted,
- the resistance between the ground contact of the coffee machine’s power plug and
the metal housing of the thermoblock is within tolerance.
Test procedure
1. Connect power plug of coffee machine to test equipment (A).
2. Switch on test equipment (B) and select protective earthing test.
3. Touch thermoblock casing with test probe through test hole in bottom part.
4. Press start button (C) and read off displayed resistance.
If test fails,
- check ground connection on thermoblock,
- replace power cord if necessary,
- repeat protective earthing test once more.
WARNING
Danger of electric shock!
Risk of damage to the coffee machine.
High test voltage - hazardous situations can arise if a wrong test is
selected or a test is executed incorrectly.
• Never touch tip of test probe or coffee machine during insulation test.
• The tests should only be performed by a competent person who is
familiar with the test equipment and the test requirements.
The resistance must be lower than 0.3 Ohm with a minimal test current
of 200 mA.
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