Unexpected Machine Stops During Production

Problem

The machine stops without operator action. Stops may repeat at intervals, correlate with speed or a specific zone, or appear randomly through the shift.

Possible Causes

1. An intermittent safety circuit — a guard vibrating toward open under production dynamics.
2. A sensor that intermittently misses its target (count or position fault).
3. Jam or product detection responding to actual product conditions.
4. Supply fluctuation or a thermal/overload trip.
5. Intermittent cabling in moving zones.

What to Check

• STEP 1Read the fault before restarting.Note the exact alarm or condition at every stop — the machine states why it stopped.
• STEP 2Identify the zone or axis.Group the recorded faults by machine area — repetition localizes the cause.
• STEP 3Check guard and interlock seating.Confirm guards are fully latched and their actuation shows no play.
• STEP 4Watch the implicated sensor.Observe detection stability at production speed — intermittent misses show as flicker or missed counts.
• STEP 5Correlate with conditions.Record speed, product batch and time for each stop to expose dependencies.

Corrective Actions

• Secure guards and interlocks found with play; report damaged latching hardware.
• Clean, align and re-teach implicated sensors per the sensor diagnosis guide.
• Address real product conditions — recurring jam detection is a process signal, not a nuisance.
• Escalate with the full stop log once the pattern is established.