Strapping Machine fault
Strapping Machine Ejects Strap
A strapping machine that ejects or retracts strap without completing a cycle is usually detecting a feed fault, position error or tension overrun — the machine has started the cycle but abandoned it before sealing.
Does this match your fault?
Common symptoms
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Strap feeds out then pulls back and ejects
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Machine ejects strap before applying tension
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Cycle starts but strap is ejected partway through
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Ejects strap on every cycle without completing
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Ejects only on certain products or load sizes
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Ejects after tension attempt but before seal
What causes this
Typical causes
Strap not reaching the sensor on return
After feeding around the arch, the strap must return and be detected by a position sensor. If the strap falls short or the sensor is dirty, the machine aborts and ejects.
Arch obstruction or guide damage
An obstruction in the arch prevents the strap completing its travel. The machine detects a timeout and ejects the strap rather than attempting to seal.
Tension overrun or overload
The machine applied tension but it exceeded the set limit — either because the load was too rigid or the tension setting is too high. The machine aborts for safety.
Feed sensor fault
A dirty or misaligned feed detection sensor is reporting an incorrect strap position, causing the machine to abort the cycle even when the strap has fed correctly.
Before calling an engineer
What to check first
These are the practical checks worth trying before calling out an engineer. If none of these resolve the fault, or if the issue keeps returning, it needs a proper diagnosis.
01
Clear and reload the strap
Remove all strap from the machine, clear the arch and reload fresh strap following the threading diagram. Test whether ejection continues with a clean strap load.
02
Check and clean the strap return sensor
Locate the sensor that detects the strap return position and clean it with a dry cloth. Check it is correctly aligned to detect the strap tip at the correct position.
03
Inspect the arch for obstructions
Use a torch to inspect the full arch interior for debris, displaced guide sections or damage. An obstruction just large enough to prevent strap return causes ejection every cycle.
04
Check the tension setting
If ejection happens after tension begins, check the tension setting. Reduce it slightly and test — if ejection stops, the setting was causing a tension overload on the load type.
When to call us
If any of these apply, call now
At this point, continued resets or workarounds are unlikely to resolve the underlying fault. A proper diagnosis is faster and cheaper than repeated call-outs for the same issue.
Arch inspected and clear but ejection continues every cycle — sensor or control fault
Ejection started suddenly after a load or strap change
Strap return sensor cleaned and aligned but fault persists
Related faults
More fault support
Report a Breakdown
Include the machine make and model, the fault you are seeing and any error codes. A photo of the display helps us triage faster.