Electronic hook scale repair
Electronic crane scales enable continuous metering and monitor control. For example, in the electrolysis workshop and metallurgy casting industry of the non-ferrous industry, the weight of aluminum (steel) water in the aluminum (steel) water jacket can be timely monitored to achieve maximum profit. When the electronic crane scale is selected in the weighing range, the most easily overlooked is the minimum weighing range. When the crane scale with an excessive weighing scale is used for small weighing, although it can also reach the specified range of national accuracy, it is relatively The error becomes larger.
There are several manufacturers of electronic crane scale repairs in Shanghai, specializing in the repair of various types of electronic crane scales.
Electronic crane scales as electronic products, sensors and instruments are the most important accessories, and are the most vulnerable parts. Consumers, as end users, are relatively unfamiliar with these accessories and the maintenance process is at a loss.
Electronic hook scale maintenance two "hidden rules" to remind everyone to guard against pitfalls during maintenance.
The first is to steal posts. "Stealth" is a common trick in the repair of electronic crane scales. When repairs are performed, parts are replaced and shoddy.
The second is to sell extra accessories. From the sales of additional accessories to earn high profits, in fact, these accessories may simply be redundant.
The hook scales are in trouble, and in addition to repairs by the manufacturers, we can also learn some of the crane scale repairs. The following are some of the common problems encountered and solutions used to use crane scales:
Problem 1: Bad Button 1. Please update the K/B test first. If the new K/B function is normal, you can determine that the K/B is bad.
2. Measure whether the line between K/B and CPU is open or cold.
3. Check if the K/B leg has poor contact.
4. Measure whether the diodes on the K/B and CPU circuits are short-circuited and open circuited.
Problem two, unable to weigh to full load 1, check the sensor output signal value is within the standard.
2. Not in the standard, please refer to item 10 for compensation.
3. If it is impossible to compensate, check if the sensor is bad.
4. If there is any instability or compensation after compensation, replace the sensor.
5, check the internal wireless material or protection device interference.
6, the battery voltage is above 6V.
7. Replace the L/C test due to bad sensor.
Problem 3, the battery can not be stored 1, please first determine the non-fuse, power switch, power cord and voltage switch caused by the problem.
2. Check whether the transformer has AC110/220 input and AC18V output.
3, the battery on the board to remove the PIN, measuring the machine version of the charging voltage is about 7.2V, if not enough, please check the power supply related circuits.
4. Check whether the diodes around the PIN of the transformer input terminal are normal.
5, replace the battery.
Problem four, sensor bad discrimination 1, static quantity law: Use the ohmic file of the three-purpose electricity meter, measure E + to S +, S- (or E-pair S +, S - also can) the resistance of the sensor separately is the same, In general, the error needs to be compensated above 0.5Ω. If the error is too large (more than 2Ω), it is recommended to replace L/C.
2. Dynamic volume method: Connect the sensor wiring correctly to the motherboard, and use the digital voltage meter (more than four and a half or more preferred) on the DCV file to measure whether the S+ voltage is equal to the S-to-ground voltage (preferably 0 error) If it is not equal, sensor compensation is required.
Problem 5: Corner coupling adjustment (single sensor)
1, first weight correction.
2, with a full load of 1/3 of the weight of the weighing pan to see its display value.
3. Press the zero on the side with the lowest value of the scale in the 1 to 4 corners of the file. (When grinding the scale for the first time, use a small force test to measure the force to avoid sensor damage.) d Repeat 2 to 3 items until the pan tilt error is within ±1 jump from the center of the pan. Do weight correction again.
4, if the error value of the scale value of the pan is too large, and after the scale is still too large, it means that the sensor has failed, or the method of grinding scale error.
Question 6, sensor compensation 1, the sensor output signal is too high, please add a resistor (50K ~ 2.2MΩ use) between the sensor's "E+S-" signal to the value of the normal range (lower resistance = sensor The lower the output signal).
2. If the output signal of the sensor is too low or -ERR, please add a resistor (50k~2.2MΩ depending on the situation) to make the signal value between the sensor's "E+~S+" to the normal range (The lower the resistance value, the higher the output signal of the sensor. high.
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