Summary of common problems of weightless scale instrument

The weightless scale instrument is turned on, but the touch screen does not display

1. Check whether the power supply is normal and whether the power switch is damaged.

2. Has the leakage switch in the distribution box tripped?

3. Check whether the switching power supply itself is damaged;

4. Check whether the 24V circuit is short-circuited and the fuse is damaged.

5. Whether the touch screen itself has quality problems.

●The 3 belts of the conveyor line do not rotate

1. Test whether the 24V voltage output by the switching power supply is normal;

2. Check whether the communication between the display screen and the programmable controller is normal (there is a "programmable controller - input and output port" option in the "system fault" in the "main menu" of the display screen.

Weightless scale instrumentIt tests the communication between the display and the programmable controller and can check for any faults in the communication.

(3) The belt of the conveyor line does not run in a single section

1. Check whether the timing belt is stuck or damaged;

2. Check whether the conveyor belt is stuck by foreign objects;

3. Check whether the connection terminals of the motor are loose or fall off.

4. Use the replacement method to switch the motor drive and motor to see if it is a drive problem or a motor failure.

Weightless scale instrumentIndicates that the detected product is unqualified, but the rejecting device does not reject or does not reach the designated position.

1. If the rejection does not exist, check whether the rejection output delay and rejection hold time of the system are set accurately;

2. Check whether the air pressure of the air compressor is normal, and check the pressure gauge;

3. Check whether the solenoid valve is faulty. Test the solenoid valve by hand to see if there is any reaction.

4. Check whether the cylinder is faulty;

5. Test whether the response of the solid state relay is normal;

6. Check whether the input and output controller part of the weightless scale instrument is burnt out.

●Sudden inaccuracy, or a large deviation from the target value

1. Check whether the parameter settings have been changed artificially;

2. The workshop environment has a large vibration or a large airflow;

3. Whether the distance between incoming materials is the same as the original distance;

4. Whether the scale is clean and whether there are foreign objects;

5. Whether the conveyor belt of the weighing platform is in contact with the other two conveyor belts;

6. Whether the screw protected by the sensor touches the edge of the weighing platform;

7. Is the sensor damaged or deformed by artificial high pressure?

8. Whether the sensor wire and motor wire are loose or too tight;

9. Whether the position of the photoelectric switch is adjusted accurately (especially when the measured object is a special-shaped part).

●The conveyor belt deviates and cannot be adjusted.

1. The belt has been used for too long, is severely worn, deformed and stretched. Consider replacing the belt.

2. The roller has been used for a long time and is seriously worn. Consider replacing it with a new roller.

●Intrinsic factors of the inspected item

1. The characteristics of the item to be tested include liquid, solid and powder. When the liquid item enters the weighing platform, since the conveyor belt of the weighing platform is moving, the shaking of the liquid in the conveyor belt will cause the change of the center of gravity of the item;

When a solid object enters the weighing platform, the vibration generated by the object is large and lasts for a long time. The system should be able to filter 2 times to resist the vibration. When the powdery object enters the weighing platform,

The powder in the package may also flow, which will also cause the center of gravity of the item to change.

2. The package of the tested item includes bags, cans and bottles. The size of the weight tolerance between the same package, the uneven bottom of the can and the bottle, the size of the bottom diameter,

And the size of the height will affect the vibration generated when the measured object enters the weighing platform.

3. The material of the object under test, the transparent object and the reflective object will affect the sensing of the photoelectric switch. However, we can effectively avoid this trouble by using the non-photoelectric weight recognition mode to check the weight.

4. The heavier the weight of the tested item, the lower the accuracy.

5. The faster the item under test and the belt, the shorter the reading time of the system, the greater the impact on the accuracy. The number of detected items per minute will also affect the accuracy.

6. The shape of the measured object, the uneven bottom surface of the abnormal object, and the large vibration entering the weighing platform have a great impact on the accuracy.

●Operating environmental factors

1. The temperature and humidity of the use environment;

2. It is not suitable for the installation of weightless scale instruments, ground vibration and airflow, near machines with large vibration, fan airflow ports and air conditioner airflow ports.

3. In the event of static electricity and electromagnetic interference, the equipment should be grounded, and the other should be separated from the high-power equipment and power supply system;

4. Take protective measures in dust and corrosive liquid places.

●Human factor

1. Incorrect parameter settings during use;

2. The distance between the acceleration section, the weighing section and the rejection section of the machine is too large or too small;

3, the scale is not balanced;

4. The conveyor belt is too loose or too tight;

5. The motor wire and sensor wire are not bundled;

6. The sensor of the weightless scale is overloaded and damaged;

7. The photoelectric switch reflector is not cleaned in time.