Mold-Masters Hot Runner, User Manual, Page: 93 / 319

6.3.6 Thermocouple Continuity Test
1. Measure the resistance between each pair of thermocouple wires on the
mold’s thermocouple connector. See Figure 6-1.
NOTE
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.
1. Mold power connector
2. Thermocouple connector
1
2
Figure 6-1 Mold plug
6.3.7 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.
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.
6.3.8 Heating Element Check
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
6-4
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ELECTRICAL TESTING
Hot Runner User Manual