What you'll learn
**Reported symptom:** The incoming supply and PSU indicators are healthy, but the +24 V distribution rail is dead.
Lab time: ~10 minutes.
Lesson briefing
Blown 24 V Control Fuse
Reported symptom: The incoming supply and PSU indicators are healthy, but the +24 V distribution rail is dead.
The circuit was commissioned from a known-good drawing. Treat every terminal as suspect, but test from source to load instead of guessing. Use voltage mode on an energised control circuit and continuity only after the simulated circuit is isolated.
Your task
Prove voltage on both sides of F1 and identify why the downstream bus has no supply.
Choose the fault category only when the measurements support it.
Hints
Confirm 24 V exists at PSU +V relative to 0 V.
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This lesson uses 9 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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