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Troubleshoot & Maintaining Checkweigher Machine:The Ultimate Guide

Jun 18,2022

The automatic checkweigher is an ideal equipment for the automated packaging production line. Therefore, automatic checkweighing scales are very popular among users. 


However, no matter how good quality products are, some failures will inevitably occur after long use. 


It's very bad!

This will Causing user complaints and even being returned by the whole box or batch.

It not only wastes manpower and material resources, but may also damage the company's reputation.


Like other machines, the checkweigher machine needs to be repaired at this time to ensure the normal operation of the equipment.


Depending on the complexity of the equipment, this can be a tiresome process. It is even worse when you’re new to the automatic Checkweigher Machine technology.


In this simple guide, I will focus on two fundamental aspects:

●Common faults and solutions of dynamic checkweighers:

●Daily maintenance of dynamic checkweigher


But before I start discussing these two topics, you need to remember the following 3 aspects.


1.Only trained and certified technicians can repair, adjust or open the Checkweighers.

These people understand all the important parts of Checkweighers. Also, they understand how these machines work.


2. Read the user manual

All checkweighers come with a set of user manuals/guides. Before starting any maintenance process, you need to understand all aspects of this product.


3.The machine operator can clean or maintain the machine

Allowing Unqualified personnel repairing and maintaining the equipment may damage the machine again. This will invalidate your warranty.


Let’s Begin our Troubleshoot & Maintaining Process.


Common faults and solutions of dynamic checkweighers:

Shanghai Shigan provides nine kinds of automatic checkweigher failure solutions, hoping to help everyone better use the automatic checkweigher;


1. The interface display of the checkweigher system is always zero

(1). The object is light and the weight falls within the zero range, which should be solved by resetting the "zero range"

(2). Weighing equipment is chasing to zero. At this time, it can be solved by adjusting the "automatic zero tracking" item in the system options

(3). The sensor data cable is loose, caused by poor contact


2. The data fluctuates greatly and the fluctuation is abnormal

(1). The screws on the base of the automatic weighing machine are loose

(2). The load cell is subject to obvious interference, such as air conditioning wind, air flow, etc.

(3). The ground shakes and vibrates, such as the rotation of nearby machines, cars passing by, etc.

(4). The conveyor belt is affected by sticky objects

(5). Sundries are accumulated or stuck in the base of the load cell

(6). The filter coefficient is set too small


3. There is no display on the touch screen of the operation interface. The possible reasons are:

(1). Poor power connection

(2). The fuse in the chassis is blown

(3). The data cable is loose or falling off


4. The data display is abnormal:

(1). The error is too large and the weighing machine system needs to be recalibrated

(2). The product model selection error, should be solved by clicking "Switch product" again and selecting the corresponding accessory product number

(3). The ambient temperature exceeds the normal working range of the load cell


5. Does the checkweigher reject device not working?

(1). First check whether the power supply is connected properly;

(2). The power supply is normal, and then click the corresponding "reject port" in the fault detection to see if it works;

(3). If it does not work, check whether the correct rejection port is selected in the rejection port.


6. The conveyor belt is not running?

(1). When all conveyor belts are not running: check the power supply;

(2). When one or two stages are not running: you can check whether the motor is driven well by reversing the motor and driver;


7. Checkweigher conveyor belt problem

(1) If the equipment has abnormal operation or deviations in accuracy and speed, please check whether the conveyor belt of consumable parts is cracked;

(2) Check that the conveyor belt has no deflection. If there is any deflection, adjust the adjustment devices on both sides until the belt has no deflection;


8. Accuracy and speed issues

(1) Check whether the conveyor belt is cracked or deflected. For such problems, the conveyor belt can be replaced or adjusted to the normal position before testing;

(2) Check the operation interface to see if the parameter settings are correct; for parameter setting problems, you can reset the value to be set according to the manual, and use the measured product for 10 times to check whether the accuracy is stable;


9. Failure caused by non-equipment factors

If the power supply is abnormal due to sudden changes in the environment, lightning or abnormal voltage, the equipment is dropped, shocked, or the cause of the accident is not directly caused by normal use, a comprehensive inspection is necessary.


If you want the assembly line automatic checkweigher equipment to effectively avoid these problems and bring greater benefits to the enterprise, the equipment must be maintained. 

Regular maintenance of the equipment can protect the instruments and meters, make the parameters of the instruments and meters normal, reduce the failure rate of the equipment, and extend the service life of the equipment.


Daily maintenance of dynamic checkweigher: 

The equipment is cared for through general methods such as wiping, cleaning, lubrication, adjustment, etc., to maintain and protect the performance of the equipment.


1. Cleaning: The inside and outside of the equipment are clean and tidy, all sliding surfaces, no oil, no oil leakage, no air leakage, and chips, debris, and dirt around the equipment should be cleaned;

2. Tidy: tools, accessories, and workpieces (products) should be placed neatly, and pipelines and lines should be organized;

3. Good lubrication: add oil or change oil on time, keep oiling, no dry friction, normal oil pressure, bright oil mark, unobstructed oil path, oil quality meet requirements, oil gun, oil cup, and felt clean;

4. Safety: Observe the safety operation regulations, do not use the equipment with overload, the safety protection device of the equipment is complete and reliable, and eliminate unsafe factors in time.


We are committed to providing customers and society with high-quality assembly line automatic checkweigher products and services. -Shanghai Shigan Industrial Co,.Ltd

Shanghai Shigan Industrial Co,.Ltd has developed and released various online dynamic automatic weight sorting checkweigher, metal detectors and combination units to meet current and future market needs. With flexible customization capabilities, through the use of the latest load cell DSP technology, compact design, high speed, high precision, stable operation, easy operation, various rejection systems, can be integrated with upstream and downstream equipment into a complete packaging line, Can be widely used, such as bag, bottle, tray, can or box packaging, medicine or seafood sorting, toy inspection, etc.; this will help strengthen quality control, increase production capacity, reduce maintenance, reduce labor, and improve production and management effectiveness.



As mentioned above, repairing and maintaining the automatic Checkweigher machine is a complicated process. It requires an in-depth understanding of each component of the checkweigher.