U service manual
Version 1.2 en
50
F U N C T I O N T E S T S
8.5
Protective earth (PE) continuity test
8.5.1 What is the protective earth continuity test about?
This test is only necessary
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for class 1 equipment (three-wire power cord with protective earth)
-
after a repair whenever a general disassembly was performed.
Therefore all U models have to be tested after general disassembly, except country-
specific models (USA, Canada, Japan) without a protective earth connection (refer to
"Wiring diagrams" on page 40 and following).
8.5.2 General
Legal regulation
In case of a repair/modification of the coffee machine, the repair centre is bound by law
to protect the user/consumer by
-
restoring the regular condition of the appliance and
-
performing the mandatory tests according to applicable national regulations (e.g.
DIN VDE 0701) or international regulations (e.g. EN/IEC 60335-1 “Safety of house-
hold and similar electrical appliances”)
Description
Protective earth continuity measurements are made between the protective earth
terminal of the power plug and the thermoblock casing.
This test assures that
-
the ground (earth) connection does not have an interruption between the power plug
and the thermoblock
-
the permissible ground resistance is less than 0.3 Ohms (with a test current of
200 mA DC).
Test equipment
Special test equipment is needed that complies with the regulations to perform protec-
tive earth continuity measurements. Detailed requirements and tolerances must be veri-
fied by your local authorities or measurement supplier in any case.
Test report
For legal reasons a repair or test report should be prepared and filed with following infor-
mation
-
customer (name, address)
-
type and serial number of coffee machine
-
date of repair/test(s)
-
performed test(s)/measuring value(s)
-
used test equipment
-
signature
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