Troubleshooting and Optimization Guide for Kenwei Multihead Weighers: Speed, Accuracy, and Common Issues Explained

When using Kenwei combination weighers, operators may encounter various technical issues that affect speed, accuracy, and performance. Below is a detailed troubleshooting and optimization guide addressing frequently asked questions and providing practical solutions based on real user feedback.

Q1: Why Aren’t All Line Vibrators Operating?

Answer:
If none of the line vibrators are moving, several causes may be considered:

1. AC 110V Transformer Failure: A burned-out transformer can be identified via visual inspection or with a multimeter.

2. Circuit Breaker Tripped: Check whether the circuit breaker controlling the vibrator has tripped.

3. Line Amplitude Too Low: The amplitude may be set too low. Adjust the line amplitude in the settings.

4. Feeding Time Too Short: Confirm the vibrator's feeding time in the Parameter Settings menu.

✅ Confirmed Cause: In the reported case, the issue was resolved by adjusting the feeding time.

Q2: What If the Hopper Experiences Material Clamping During Operation?

Answer:
Material clamping in the hopper usually occurs under two scenarios:

• Excess Material Accumulation: If the discharge door closes before the material is emptied, enable Low-Speed Motor Mode and extend the hopper’s open time.

• Falling Material During Door Closure: If material continues to fall while the hopper door is closing, increase the delay time of the vibrator or upper hopper.

These adjustments prevent the door from closing on falling material and reduce blockage.

Q3: Which Parameters Affect Weighing Speed?

Answer:
The weighing speed is directly influenced by:

• Sampling Stabilization Time

• Storage Hopper Delay

For example:

• 10-head weigher:
  Sampling Stabilization Time < 6000 - Storage Hopper Delay

• 14-head weigher:
  Sampling Stabilization Time < 6000 ÷ Speed (Level 2) - Storage Hopper Delay

Reducing these values within the recommended limits helps maximize speed output.

Q4: How Can I Improve the Weighing Accuracy of a Combination Weigher?

Answer:
Accuracy can be categorized into:

• Display Accuracy

• Actual Accuracy

• Combined Display and Actual Accuracy

To enhance actual weighing precision:

1. Ensure Consistent Material Supply.

2. Optimize Bucket Combination: Adjust vibrator amplitude, feeding time, and material thickness to keep the average number of working buckets at 50% of total heads.

3. Improve Installation Stability:

   • Proper grounding

   • Level and firm platform

   • No vibration or leg suspension

4. Increase Filter Coefficient & Sampling Time: This enhances anti-interference and stability.

These adjustments collectively improve both display and actual accuracy.

Q5: Why Is My 14-Head Weigher Running Below 80 Packs/Minute for 30g Potato Chips?

Answer:
Kenwei's 14-head weigher is capable of up to 120 packs per minute for 30g potato chips. If you're only achieving <80 packs/min, consider these issues:

1. Insufficient Material Supply: Causes inconsistent weighing cycles.

2. Improper Parameter Settings: Ensure:

   • Sampling Stabilization Time < 6000 ÷ Speed (Level 2) - Hopper Delay

3. Feeding Parameters:

   • Adjust vibration amplitude, feeding time, and material thickness to ensure smooth hopper transfer.

4. Low Preset Speed: If the target speed is set too low, the system performance will be capped.

✅ Confirmed Cause: The preset speed was set too low, limiting the overall throughput.

Conclusion

Proper setup, regular parameter review, and understanding the machine’s operating logic are essential for maximizing performance and ensuring consistent weighing accuracy. Kenwei's combination weighers are designed for high efficiency, and with the right adjustments, users can significantly improve speed and precision for a wide range of products.