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7.3.5 Verification of Fault Loop Impedance
Fault loop impedance verification and suitability of the associated overcurrent
protective device.
The power supply connections and incoming external grounding connections
to the Hot Runner system must be verified by inspection (usually through a
temperature control device).
The conditions for protection by automatic disconnection of supply must be
checked by both:
• Checking the impedance of the fault loop by calculation or measurement.
•
Confirming that the setting and characteristics of the associated
overcurrent protective device are in accordance with the requirements of
the standard.
For more information, see the text of the EN 60204-1/ NFPA79 standards.
7.4 Thermocouple Continuity Test
1. Measure the resistance between each pair of thermocouple wires on the
mold’s thermocouple connector. The resistance should be between 2.5 Ω
and 25 Ω.
2. To verify alignment of thermocouple in the heating element, turn on one
zone after the other and check that the temperature responds accordingly
if the set temperature is adjusted.
7.5 Pinch Point Test
3. If there is a suspected pinch point on the thermocouple, remove the
thermocouple from the Hot Runner.
4. Connect a temperature control device to read the temperature.
5. Immerse the sheath of the thermocouple in boiling water to the point
where the thermocouple reads the temperature.
6. A good thermocouple will show a temperature rise as soon as the tip of
the thermocouple is immersed in water. If there is a pinch point in the
thermocouple there will be no change in the reading until the pinch point
on the thermocouple is immersed in water.
7-3
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ELECTRICAL TESTING
FSG2 User Manual