A paper cup machine cable carrier can conceal a conductor that fails only at one travel position. Replacing a sensor may temporarily move the cable and hide the symptom without removing the cause. The useful starting point is a relationship between machine position, cable motion and the reported fault.
Apply this guide only to a moving station fitted with an energy chain or drag chain. Fixed conduit and free-hanging cable loops need different assessments. This note addresses moving-cable routing and fatigue, not the fixed panel-entry details covered in the related guide.
Diagnostic decision table
| Evidence | Possible distinction | Record to collect |
|---|---|---|
| Fault repeats near a travel end | Local bend or connector loading | Position and direction of travel |
| Jacket rubs through at one link | Carrier damage or poor separation | Wear location and adjacent contents |
| Cable bunches on return | Incorrect routing or restraint | Both ends of the complete stroke |
| Fault continues with axis stationary | Another electrical cause remains | Signal history without motion |
Map the fault against physical movement
Record the affected circuit, exact alarm, axis position and travel direction. Compare outward and return travel at the same point. Use existing diagnostics or guarded video; do not pull a cable by hand while the machine is moving. Note whether several circuits in the same carrier fail together.
A position-dependent fault is evidence for inspection, not proof of a broken conductor. A loose connector, damaged hose or mechanical collision can produce a similar pattern. Keep the original alarm timeline before unplugging equipment so the electrical technician can compare symptoms with the physical route.
Inspect the carrier before buying a cable
Isolate electrical, pneumatic and stored mechanical energy according to the machine procedure. Inspect crossbars, side links, end brackets, separators and the support path. Look for broken edges, paper dust mixed with oil, loose fasteners and contact with nearby guards. Photograph the complete arrangement before changing it.
Check whether added cables have crowded an originally acceptable layout. Read the carrier identification and installed cable markings. Obtain the approved bend radius and fill arrangement for these exact items; an outside-diameter match does not prove that a replacement cable is suitable for repeated flexing.
Separate cable capability from installation quality
Continuous-flex suitability, conductor size, shielding, jacket chemistry and connector requirements must all match the circuit and environment. A cable can be electrically correct but mechanically unsuitable for the travel frequency or bending arrangement. Request both the electrical specification and the motion-use specification.
Igus guidance emphasizes allowing cables to move through the carrier radius without unwanted tensile loading, with appropriate separation and restraint. Use its guidance as a design principle, not a universal clearance value. The installed cable maker and carrier maker must resolve the permitted bend and routing arrangement together.
Replace without adding twist or hidden tension
Qualified personnel should record connector pin assignments and isolate connected electronics before any prescribed cable tests. Do not apply an insulation tester through sensors, drives or control modules. A simple continuity result at rest may not reveal an intermittent motion-related fault.
Install the approved replacement without twist, following the supplier method for length and strain relief. Inspect the route across the full travel using the machine-approved safe positioning procedure. Cable ties should not force a flexible section into an unsupported sharp bend. Restore separator positions and all covers before powered verification.
Validate the route and the circuit together
Use the approved staged restart to compare repeated travel in both directions. Check the original alarm, communication status and station operation while observing the carrier from outside the guarded area. Stop if the cable bunches, pulls tight or strikes a nearby structure.
After the initial run, isolate the machine again for a focused wear and restraint inspection. Keep cable part number, carrier identity, routing photos and the before-and-after alarm record. Send HANNAI the travel-position evidence when requesting support; this is more actionable than ordering another sensor without identifying the motion-related failure path.
Related equipment and next checks
Review the HN-M100 paper cup machine and the related guide to fixed cabinet cable entries and shielding. The Engineering Notes archive connects these checks with wider machine planning.
Technical reference
- Igus cable-carrier installation guidance — general reference; confirm applicability to the installed equipment.
Frequently asked questions
Can ordinary flexible cable replace a drag-chain cable?
Only if the supplier confirms the required repeated-motion capability.
Does a continuity test prove the cable is healthy?
Not necessarily; intermittent fatigue can depend on position and loading.
Should every cable be tightly tied inside the carrier?
No. Follow the approved separation and strain-relief arrangement.
What evidence should accompany a support request?
Circuit identity, travel position, alarm history and full-route photographs.
Review the evidence with HANNAI
Send your machine model, component identification and the observations described in this guide. Include the drawing or material reference and any before-and-after measurements so the required next check can be identified.