Weight Scale Out of Tolerance

In-line checkweigher or weight scale reading is outside the acceptable tolerance band. Product may be over or under the target weight.

Probable Causes (ranked)

• Scale not zeroed — tare weight has drifted from buildup on conveyor or platter
• Load cell damaged or overloaded — dropped heavy object on scale
• Vibration from nearby equipment coupling into scale — causes noisy readings
• Scale conveyor belt tension changed — dragging on frame adds false weight
• Product recipe or target weight changed without updating scale parameters
• Ambient temperature shift — large temperature changes affect load cell accuracy

Fix Steps

1. 1 Run zero calibration with scale empty — clear any debris from weigh platter or belt
2. 2 Run span calibration with certified test weight — verify reading matches test weight
3. 3 Check for vibration sources near the scale — isolate with vibration dampening mounts if needed
4. 4 Inspect scale conveyor belt — verify it moves freely without dragging on the frame
5. 5 Verify target weight and tolerance band settings match current product specification
6. 6 Check load cell cable connections — corrosion or moisture in junction box causes drift
7. 7 If readings are erratic, swap load cell with known-good unit to confirm failure

Suggested Replacement Parts

Parts matched to fault category: Scale Load Cell

Prices are estimates. Verify part numbers match your equipment before ordering.

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