Dp.2 Check The Tank Or Manifold Rtd - Nordson ProBlue P4 Customer Product Manual

6-12
Troubleshooting

DP.2 Check the Tank or Manifold RTD

Part 1024496_06
1. Check the left display to determine which RTD (tank or manifold) is
faulting. The display indicates 1 if the tank RTD is faulting or 2 if the
manifold RTD is faulting.
2. De‐energize the melter. Refer to Section 1, Safety.
NOTE: If the melter has already cooled down, solidified hot melt within the
pump/manifold will prevent you from removing the pump. To remove the
pump, you must reheat the melter. Refer to Reheating the Melter During an
F1 Fault at the end of this procedure.
See Figure 6‐2.
3. Remove the RTD from its retention slot.
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For the tank RTD, refer to Remove the Tank RTD.
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For the manifold RTD, refer to Remove the Manifold RTD.
4. Allow the RTD to cool to room temperature or use a pyrometer to
accurately determine the temperature of the RTD.
5. When the temperature of the RTD is known, measure the resistance of
the RTD across terminals 1 and 2 (tank RTD) or 3 and 4 (manifold RTD).
See Figure 6‐5.
6. Determine the expected resistance of the RTD at the known temperature.
Compare the expected and measured resistance values and then do one
of the following:
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If the measured resistance is within the expected resistance range,
the RTD is functioning properly. Replace the main board (P4 or P7
melters, use P/N 1028322; P10 melter, use P/N 1038323).
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If the measured resistance is not within the expected resistance
range, the RTD is defective. Replace the RTD (P/N 1028320).
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