7.3 Electrical Safety Testing
1. Electrical safety tests shall be performed according to DIN EN 60204-1,
paragraph 18 and NFPA79. Testing guidelines are given below, however
the standards identified earlier in the introduction are the final authority.
7.3.1 Verify Equipment to its Technical Documentation
2. First, verify that the electrical equipment complies with its technical
documentation.
7.3.2 Insulation Resistance Test
3. Measure the insulation resistance between each pin of the
Mold-Masters
power connector, in particular the heating circuit and
ground.
4. The insulation resistance is measured at a DC voltage of 500V. The
insulation resistance must not be less than 1 MΩ.
5. If this value is not reached when heating, the cause is often moisture
inside the heating element, which should be removed using a control unit
equipped with this function.
6. Where a mold has not been in use for several weeks or months, it should
be re-tested.
7.3.3
Verification of Conditions for Protection by
Automatic Disconnection of Supply
WARNING
The user is responsible to take protective measures against shock by
indirect contact, while performing the tests.
The conditions for automatic shutdown of the supply are set at
Mold-Masters
and usually set such that the protective conductor resistance
between the grounding conductor connection and all of the protective earth
conductor connected parts, is Maximum 0.3 Ω.
In TN systems the following two checks are made:
7.3.4
Verification of Continuity of Protective Bonding
Circuit
Verifies the continuity of the protective bonding circuit. The purpose of this
test is to check whether all relevant touchable conductive parts are properly
grounded. See the relevant requirements of the standard DIN EN 60204-1 /
NPFPA79.
The protective conductor resistance is measured with a special instrument
with a current between at least 0.2 A and approximately 10 A derived from
an electrically separated supply source (for example SELV, see 413.1 of
IEC 60364-4-41) having a maximum no-load voltage of 24 V AC or DC. The
resistance must be within the expected range.
7-2
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ELECTRICAL TESTING
FSG2 User Manual
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