Basis is a reference measurement with an assembly conducted and stored by the PTM.
PTM tracks the assemblies’ positions in the process tunnel. In each heating zone, the zone temperature is compared with the reference. In case of deviations, the PTM issues messages or stops production. This ensures the monitoring of predefined process windows for each assembly in the oven and prevents production of faulty parts. The base line for temperature measurement is mounted on the rails of the conveyor. It contains several thermocouples so that there is a thermocouple in each heating and cooling zone. In a single-track system, there are two independent temperature sensors in each heating and cooling zone with which the temperature behavior is recorded. Due to the time dependence of the temperature profile, the conveyor speed of the system is detected with sensors and also continuously monitored. The seamless monitoring of predefined process windows for each assembly in the reflow oven is ensured and also can be traced afterwards, because the process data determined is saved as a data package.
Productronica 2019: Halle A4, Stand 171