Investigation sequence
Record connected devices
List external 24 V loads, sensors, I/O wiring, feedback devices and option modules.
Classify trip timing
Separate power-up, cold, hot-load and motion-related failures.
Isolate external loads
Under documented procedure, remove branches to see whether the 24 V fault or feedback symptom follows an external load.
Inspect cooling and feedback
Check fans/heatsink for thermal trips and encoder cable shielding/supply for feedback symptoms.
Escalate internal board
Only after external loads/modules are proven should the internal control supply or feedback electronics be suspected.
Stop conditions
- Machine cannot be secured
- External wiring is undocumented
- 24 V rail remains shorted
- Option-module state is unknown
Linked records
The internal or auxiliary 24 V control-supply path is overloaded, shorted or unstable. The route begins with external loads, terminal wiring, option modules and supply rail evidence.
The drive thermal path has exceeded its safe boundary or the temperature feedback is not credible. Route by cold-start versus hot-load timing.
The drive may be reacting to poor or noisy feedback rather than a failed output module. The route begins with encoder supply, shield/grounding, cable routing, option module and motor-data evidence.
Routes PS.24V, thermal feedback and encoder instability through external 24 V loads, option modules, feedback wiring, sensor supply, heatsink feedback and control-board evidence.