Tech-Long filler faults — a fast troubleshooting guide

Tech-Long is a PET bottling OEM (blow–fill–cap combiblock) very common in beverage & brewery plants in Vietnam. When the line faults and stops, downtime costs money by the minute. Because it is a combined multi-block line, the key is to localize fast: which block is at fault, mechanical or comms between blocks.

Common fault groups

1. HMI / block alarm — the screen shows an alarm; read the correct code and the order of events.
2. Servo / VFD — the fill/positioning axis faults, overload, position offset.
3. Sensors & position — bottle/cap/starwheel sensors dirty, misaligned, failed → safe stop.
4. Comms between blocks — lost interlock signal between panels (network/IO), one block “drops”.
5. Air / pressure — PET blowing needs high pressure; a pressure/valve fault stops the blow block.

Troubleshooting approach

1. Read the root alarm On the HMI, find the first alarm by timestamp — usually the root block; later ones are interlock consequences.
2. Localize the block Identify the fault at blow / fill / cap / label / pack; separate mechanical from control.
3. Check servo/VFD Read the drive fault code of the relevant block; check overload, position, feedback.
4. Check sensors Clean/align the bottle-cap-starwheel sensors; check the signal wiring.
5. Interlock comms If a block “drops” from the system: check the network/IO between panels (error LEDs, cables, nodes).
6. Air/pressure For the blow block: check high pressure, valves, leaks; compare to the required threshold.

When to call an expert

A combined line with comms faults between blocks is a classic tough case — DeepDebug is strong precisely in industrial communications and works remotely, restoring production fast instead of waiting for the OEM expert.