Nordson ProBlue Flex - Troubleshoot the Melter; Checking the Melt or Manifold RTD; Checking the Operation of the Thermostats

Troubleshooting
6-20
Part 1128350_02
E 2020 Nordson Corporation
Troubleshoot the Melter
If the following procedures fail to correct the problem, contact your Nordson
representative for technical assistance.
Checking the Melt or Manifold RTD
1. De-energize the melter. Refer to Safe ty (Section 1).
2. Remove the RTD from its retention slot.
- For the melt RTD, refer to Removing the Level Sensor, Melt RTD, or
Melt Thermostat in the following page.
- For the manifold RTD, refer to Removing the Manifold RTD.
3. Allow the RTD to cool to room temperature or use a pyrometer to
accurately determine the temperature of the RTD.
4. When the temperature of the RTD is known, measure the resistance of
the RTD across terminals 1 and 2 (melt RTD) or 4 and 5 (manifold RTD).
5. 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:
- If the measured resistance is wit hin the expected resistance range,
the RTD is functioning properly. Replace the 6-channel power
module.
- If the measured resistance is not within the expected resistance
range, the RTD is defective. Replace the RTD.
Checking the Operation of the Thermostats
1. De-energize the melter. Refer to Safe ty (Section 1).
2. With receptacle X19 removed from the LVC board, check the continuity
between X19 pins 1 and 2. The correct measurement is a short circuit.
If the measurement is an open circuit, check the thermostat, thermostat
harness connections, or the X19-to-thermostat harness. Replace the
faulty component.