Temperature protection is only as good as its measurement point and response. A detector in the bearing housing can lag and read differently from the hottest internal surface.
| Input | Approval question | Evidence |
|---|---|---|
| Sensor | Where and how is it installed? | Arrangement drawing and calibration |
| Baseline | What is normal at comparable duty? | Load/ambient temperature trend |
| Alarm | What action starts before damage? | Operator response procedure |
| Trip | What limit and delay protect the train? | Supplier basis and functional test |
Commission the full chain
Check wiring identity, transmitter range, scaling and failure mode. Simulate the signal through the monitoring and shutdown path. Trend both bearings during initial service and investigate step changes, widening side-to-side differences or temperature rise accompanied by vibration.
Related reading: bearing temperature limits and bearing failure analysis.