Protective Earth (Pe) Continuity Test; What Coffee Machine Has To Be Tested And When; General - Nespresso Maestria EF 285 Service Manual

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130
F U N C T I O N T E S T S
9.9

Protective earth (PE) continuity test

9.9.1 What coffee machine has to be tested and when?

This test is only necessary
- for class 1 equipment (three-wire power cord with protective earth)
- after a repair whenever a general disassembly of the platform and/or core unit was
performed.
Therefore all Maestria models with a protective earth connection have to be tested after
general disassembly (refer to "Wiring diagrams" on page 91 and following).

9.9.2 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 respective tests according to EN/IEC 60335-1 "Safety of household
and similar electrical appliances" and national regulations (e.g. DIN VDE 0701).
Description
Protective earth continuity measurements are made between the protective earth
terminal of the power plug and all conductive, touchable parts of the coffee machine
where dangerous voltage could occur if the basic insulation was to fail.
This test assures that
- the ground (earth) connection does not have an interruption between the power plug
and the terminal block as well as touchable, conductive housing parts
- the permissible ground resistance of those conductive parts 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
Maestria / Gran Maestria service manual