Car scales, also known as weighbridges, are the main weighing equipment used for measuring bulk goods in factories, mines, merchants, and other industries. So if a car scale malfunctions, how do you check it and how do you troubleshoot it?

 

1、 Find the fault location

If a truck scale malfunctions and cannot work, the first step is to identify the location where the malfunction occurred. The easiest way is to use a simulator to locate it.

Disconnect the signal cable from the junction box to the instrument, insert the simulator socket (9-core D-type flat socket) into the weighing display controller interface J1, connect the power, and check if the weighing display controller is working properly. This indicates that the fault is on the weighing platform. If the weighing display controller is not working properly, the fault is on the weighing display. The troubleshooting must be carried out by specialized inspectors.

 

2、 Scale platform fault analysis

1. Firstly, check the junction box for water vapor intrusion. If there is water vapor, wipe it with alcohol, and then dry it with a hair dryer to clean the interior.

2. Find out if there is a short circuit in the wiring. Use a multimeter to measure the resistance between the shielded wire and other wires in the junction box to see if there is a short circuit. If a short circuit is found, the cable needs to be replaced. If there is no fault, continue to search according to the following steps.

 

3. The steps to find sensor faults are as follows:

a.Use a multimeter inside the junction box to check the resistance value between the positive (E+) and negative (E -) of the excitation power supply, which is approximately 780 Ω/sensor count.

b.Disconnect the sensors one by one and measure the impedance value between the positive and negative excitation terminals or the positive and negative output terminals using the method of a to see if it matches the resistance value on the certificate of conformity. Identify the damaged sensor. Of course, you can also press the next step to search for it.

c.Place the weights with the maximum weighing capacity of 1/(n-1) on each load-bearing point of the weighing platform in sequence. If any load-bearing point is found to have incorrect readings, it indicates that there is a problem with the sensor at that point and should be replaced.

 

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