Check if the grounding wire of the heater body is intact and installed firmly to avoid personal electric shock accidents

Check if the grounding wire of the heater body is intact and installed firmly to avoid personal electric shock accidents

Check if the cooling fan at the bottom of the SCR power regulator and the cooling fan in the cabinet are working properly. If they stop running, replace them with new fans immediately;

Check if the air conditioning in the distribution room of the control cabinet is working properly, measure and record the temperature of the distribution room. If any abnormalities are found, they should be replaced and dealt with in a timely manner; Measure the operating temperature of the thyristor power regulator. When the measured value approaches 70 ℃, measures should be taken to improve ventilation and heat dissipation, and reduce temperature. If necessary, stop the operation and inspection of this group;

Record the maximum operating current of each group of electric heaters and compare it with previous data. Adjust the parameters of the temperature controller appropriately to increase the power of the heaters.

During heater maintenance, the power switch and main heater should be regularly disconnected or checked. After the unit shuts down, the electric heater should be checked immediately to ensure that the problem can be detected as soon as possible and there is enough time to handle it. The experimental items include: three-phase DC resistance and insulation resistance of each phase in each group, and records should be kept. If the insulation resistance is found to be less than 1m Ω, the cable head should be removed and the insulation resistance of the cable and electric heating tube should be measured separately to distinguish whether it is a cable problem or an electric heating tube problem. If an imbalance in the three-phase DC resistance is found, the cable and electric heating tube should be measured separately to determine the specific location and quantity. At the same time, check the core pulling condition of the electric heater, remove dust inside the heater, clean the electric heating tubes for descaling, inspect the appearance and fastening of the electric heating tubes, tighten the connecting wires inside the control cabinet, and check and confirm whether the thermometer and temperature controller are working properly. Before starting the unit, the insulation resistance of the heater should be re measured. When it is found that the insulation resistance of individual groups is low, it is prohibited to power on to avoid damaging the electric heating tube or cable. Media should be introduced in advance to dry the interior of the heater. Only after the insulation resistance is qualified can power be sent and put into operation.

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