Protective Insulation Test (1) - Nespresso Essenza EF 347 Service Manual

Function Tests

Protective insulation test (1)

Perform the protective earth conti-
nuity test at first, if it is mandatory.
What is the protective insulation test
about?
This test is necessary
- for class 1 and 2 equipment (with/without
protective earth),
- after a repair whenever the housing was
opened and for example a general disas-
sembly was performed.
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 appli-
ance 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
The insulation test
- assures that wiring and insulation of the
coffee machine fullfill the normative
Service Manual EF 347 / EF 348
requirements after a repair,
- rates the insulation capability of the coffee
machine,
- is a very dangerous test because of a high
test voltage (500 V DC).
For the insulation test, phase and neutral wire
are shunted at the power plug. Then a test
voltage is applied between phase/neutral and
selected parts of the coffee machine.
Test equipment
Special test equipment is needed that complies
with the regulations to perform insulation and
withstanding voltage tests. Detailed require-
ments and tolerances must be verified with
your local authorities or measurement supplier
in any case.
Ideally the test equipment has a national
power socket for testing, so that the coffee
machine can plugged in directly. Otherwise a
special shunt is necessary to connect the
phase and neutral pin of the coffee machine's
power plug.
3 7
Test report
For legal reasons a repair or test report should
be prepared and filed with following informa-
tion
- customer (name, address)
- type and serial number of coffee machine
- date of repair/test(s)
- performed test(s)/measuring value(s), test
points
- used test equipment
- signature
Test sequence
Danger of electrical shock/short
circuit!
• Do not plug in the coffee machine
during insulation test.
Danger of electrical shock!
• Do not touch tip of test probes.
• Do not touch metallic parts of coffee
machine during test.
• Read and observe safety instructions
in user manual of test equipment.
Continued on next page.
Version 1.0 en