The determination of short circuit in mold heating tubes is a relatively professional and meticulous process, which can be mainly achieved through the following methods:
1、 Use a multimeter to check resistance
1. Turn off the power: First, make sure to turn off the power and unplug the plug before testing to avoid the risk of electric shock.
2. Select measurement mode: Turn the knob of the multimeter to the Ω position (resistance position). If the multimeter has automatic calibration function, then there is no need to manually adjust it; Otherwise, calibration should be carried out according to the instructions.
4. Wiring operation: Connect the black test needle to one end of the heating tube (or a thin line in the middle, depending on the specific heating tube structure), and connect the red test needle to the other end of the heating tube. Ensure a stable connection to obtain accurate measurement results.
5. Reading result: Observe the resistance value displayed on the multimeter. If the resistance value is infinite or close to the nominal value, it indicates that the heating tube is working properly; If the resistance value is close to 0, it is likely to indicate a short circuit inside the heating tube.
2、 Use current clamps and DC power supply for detection
1. Prepare tools: In addition to current clamps and DC power supply, ensure that there are appropriate connecting wires.
2. Wiring operation: Clamp the current clamp on the positive wire of the heating tube, and then connect the red wire of the DC power supply to the positive electrode of the heating tube and the black wire to the negative electrode.
3. Observe current: Turn on the DC power supply and observe the current value. If the current value is within the normal range and matches the rated power of the heating tube, it indicates that the heating tube is working properly; If the current value increases abnormally or reaches the maximum value of the power supply, it may be a short circuit in the heating tube.
3、 Use a thermal imager for inspection
1. Preparation tool: A thermal imager is a device that can detect the temperature distribution on the surface of an object.
2. Heating operation: When the heating tube is working, use a thermal imager to scan the surface of the heating tube.
3. Observe temperature distribution: If the surface temperature distribution of the heating tube is uniform, it indicates that it is working normally; If there is an abnormal increase in local temperature on the surface, it may be due to a short circuit in that area.
4、 Precautions
Before conducting any testing, make sure to turn off the power and unplug the plug.
When using professional tools for testing, it is necessary to strictly follow the instructions or the guidance of professionals.
If a short circuit is found in the heating tube, it should be replaced or repaired in a timely manner to avoid further damage to the equipment.
In summary, methods such as using a multimeter to detect resistance, using current clamps and a DC power supply to detect current, and using a thermal imager to detect temperature distribution can effectively determine whether the mold heating tube is short circuited.
