Some Common Faults and Their Solutions With an Online Check Weigher

Online weighing machines, also known as online check weighers, automatic weighing machines, automatic checkweighers, sorting scales, and weighing inspection machines, are commonly used. The online check weigher is a device on the assembly line that detects weight automatically, identifies upper and lower lines, and selects weight classifications. There may be some minor flaws during use, so how can we fix them ourselves? In this article, we have compiled a list of common defects and solutions for automatic weighing machines in operation, to help you.  

1. The checkweigher is turned on, but the touch screen does not display.  

Solution:

• Check if the power supply is okay and if the power supply's switch is damaged. 
• Determine whether the leakage switch in the electric box has triggered. 
• Inspect the switching power supply whether it is damaged.
• Check for a short circuit in the 24V circuit and whether the fuse has burned.

2. Weighing using online check weighers is not allowed.  

Solution:  

• Check if other things contact the weighing tray.
• Next, check if the equipment is calibrated and can be recalibrated.
• Check if there is wind blowing against the equipment.
• Compare static weighing. If it is inconsistent with dynamic weighting, it can be fixed using 'dynamic learning.'

3. Does the online check weigher's static weighing differ from its dynamic weighing? 

Solution: 

• The weight of the object is in two states: static and winter, and there is an inaccuracy in the weighing result that can be remedied via 'dynamic learning.'

4. The checkweigher's conveyor belt isn't running.  

Solutions: 

• When all conveyor belts are not functioning, check the power supply. 
• If one or two portions are not operating, verify by reversing the motor and driver. It is the quality of the motor drive.  

5. Problem with the conveyor belt of the online check weigher 

Solution:

• If the equipment performs improperly or has variations in accuracy and speed, please examine if the conveyor belt of the consumable components is damaged.
• Determine if the conveyor belt is deflected. If there is deflection, adjust the adjustment mechanisms on both sides until the belt is deflection-free.

6. The online check weigher rejection device does not function. 

Solution:

• First, ensure that the power supply is properly connected.
• Whether the power supply is normal, click the corresponding 'rejection port' in the fault detection to see whether it works.
• If not, check that the culling port is chosen in the culling port. 

7. Online check weigher machine's accuracy and speed issues:  

Solution:

• Check if the conveyor belt is fractured or deflected. In such cases, the conveyor belt can be replaced or corrected to its normal position and then tested. 
• Check the operating interface to verify if the parameter settings are accurate. If the parameters are set correctly, you may reset the value to be set according to the handbook and use the real product to execute. Next, determine whether the accuracy is steady.

8. All three belts in the conveying line do not spin.

Solution:

• Verify that the switching power supply's 24V voltage output is normal.
• Verify that the communication between the display screen and the PLC is normal (in the 'System Fault' section of the display screen's 'Main Menu', there is a 'PLC-IO port' option that tests the communication between the display screen and the PLC and can determine whether it is faulty).

9. The conveyor belt runs in many segments.

Solution:

• First, check that the synchronous belt is not blocked or broken.
• Next, check that the conveyor belt is not trapped with foreign items.
• Check if the motor's connecting terminals are loose or have fallen off. 
• To determine if the fault is with the motor drive or the motor itself, use the replacement procedure to swap between the two.

10. The online check weigher machine indicates that the discovered product is unqualified; nevertheless, the rejection device does not reject, or the rejection is not in place. 

• The rejection is not in place; ensure that the system's rejection output delay and rejection holding time are configured appropriately.
• Check the air compressor. Check that the air pressure is normal, using the pressure gauge.
• Check whether the solenoid valve is malfunctioning. Try the solenoid valve manually to check if there is any reaction.
• Check if the cylinder is defective.
• Determine whether the solid-state relay response is normal.
• Troubleshoot and determine whether the weighing scale's IO controller has burnt out.

11. The conveyor belt on the online weighing machine deviates and cannot be corrected.

Solution:

• The belt has been used for much too long, and it is heavily worn and bent. Consider changing the belt.
• If the roller has been used for an extended period of time and is severely worn, consider replacing it with a new roller.

Conclusion

If your checkweigher often malfunctions despite regular maintenance and crew training, it may be time to change to more appropriate, current equipment. The most recent versions combine maximum precision with high-speed stability to decrease mistakes, malfunctions, and hassles.