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8-3 ELECTRICAL TESTING
© 2020 Mold-Masters (2007) Limited. All Rights Reserved. Dura+ User Manual
8.5 Pinch Point Test
1. If there is a suspected pinch point on the thermocouple, remove the
thermocouple from the Hot Runner.
2. Connect a temperature control device to read the temperature.
3. Immerse the sheath of the thermocouple in boiling water to the point
where the thermocouple reads the temperature.
4. 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.
8.6 Heater Continuity
Measure the resistance between each pair of heater power wires at the mold
power connector.
Compare your reading with your General Assembly drawing.
Where:
R =
V
2
P
R = resistance V = voltage P = power
8.7 Thermocouple Wiring Guidelines
CAUTION
Exceeding controller zone amperage will cause controller fuses to blow.
CAUTION
• Thermocouples are type “J” ungrounded and color-coded to ASA
standards. White = “+” and Red = “-”
• The tip must not be truncated or squeezed and must touch the
bottom of the bore in order to measure the correct temperature.
• Each heat source should have its own closed loop temperature
control in order to achieve accurate control.
• If there are not enough control zones, heat sources that have the
same wattage and affect the same environment may be grouped
together.