Strapping/Banding Machine Cycles But Won't Complete
The machine starts its cycle but stops before it finishes. Where it halts is the most useful piece of information - the stage at which it stops usually tells you which system has the fault.
Common symptoms
Note where in the cycle the machine stops - feed, tension, seal or cut. That detail alone narrows it down significantly.
Machine stops at the same point in the cycle every time
A consistent halt point is a reliable diagnostic signal. If it always stops at tension, the tension system has the fault. If it always stops at cut, that's where to look.
Machine starts then stops with no alarm showing
A stop without an alarm often means the machine hit a limit condition it wasn't expecting. Check for partially latched safety devices or a guard that isn't fully closed.
Cycle takes noticeably longer before failing
A slow cycle that eventually stops suggests a component working hard but failing to complete its stage. Motor issues often present this way - output drops gradually before the machine times out.
Machine needs multiple resets before completing a cycle
If restarting occasionally gets a full cycle through, the fault is intermittent. Harder to diagnose but still diagnosable - especially if it's getting worse over time.
Machine completes tension but won't cut
The cutter mechanism has a fault - either the blade, the cam that drives it, or the actuator that triggers the cut. The tension system is fine; the fault is downstream of it.
Alarm code shows but it's not in the manual
Write the code down and take a photo of the display. Non-standard codes are sometimes specific to a hardware revision not covered in the general manual - we can often identify them from the model number.
Typical causes
Sensor fault
Sensors confirm that each stage of the cycle has completed before the next can begin. A faulty sensor can stop the cycle at any point by failing to confirm completion - the machine won't proceed past a stage it doesn't believe has finished.
Motor weakening
A motor drawing excess current or failing to generate enough torque will slow and eventually stop. The machine may detect this via a current limit or a cycle timeout. The symptom is a cycle that takes longer and longer before failing.
Partial mechanical obstruction
Something in the drive path is dragging or binding without creating a complete jam. Enough resistance to stop the cycle but not enough to trigger a jam alarm. Often a worn bearing, a bent component or accumulated debris in the mechanism.
Program or timing fault
A timing relay or program parameter has drifted outside tolerance. Less common than the mechanical causes above, but more likely on electronic machines that have had a power interruption or a recent settings change.
What to check first
The halt point and any alarm code are the two most useful pieces of information. Get those before anything else.
Note exactly where in the cycle it stops
Feed, tension, seal or cut. Write it down before resetting. Knowing the halt point before calling saves significant diagnostic time - it's the first thing we'll ask.
Check for alarm codes on the display
Check the panel for any fault or alarm code immediately after the machine stops - before resetting. Take a photo. The code is the machine telling you which subsystem flagged the halt.
Run 5 cycles and map the pattern
Does it always stop at the same stage? Or does it fail at different points? Consistent failures point to specific component faults. Variable failures suggest something intermittent - a sensor, a connection or a thermal issue.
Check for binding or drag in the mechanism
With the machine isolated, manually work through the drive mechanism. Any stiffness, grinding or visible damage in the cycle path at or near the halt point is relevant - especially if you can feel resistance where there shouldn't be any.
If any of these apply, don't wait
- The machine is failing to complete the majority of cycles
- The halt point is consistent and you've found no obvious cause from the checks above
- The machine is taking noticeably longer to reach the halt point than it did a week ago
- A motor is audibly struggling before the stop occurs
A machine stopping mid-cycle won't fix itself. If you've worked through the checks above without finding the cause, the fault is inside the mechanism and needs hands-on diagnosis.