雨天時に機械設備が水浸しになった場合、どうすればよいですか？

Affected by the extreme rainfall of typhoon “Dusuri” this time, it has caused heavy rainfall in Fujian, Henan, Hebei, Tianjin and other places, and the production workshop was soaked in flood water, resulting in the stagnation of all production. What should you do if your equipment has been flooded or soaked in water to varying degrees? How to deal with it in the shortest time to reduce losses.

JWELL gives you advice

1. Disconnect all power supplies to ensure that the whole machine is disconnected from the grid
2. When there is a hidden danger of water ingress in the workshop, please stop the machine immediately and turn off the main power supply to ensure the safety of equipment and personnel. If conditions permit, raise the entire line; if the conditions are not met, please protect the core components, such as the main motor, power cabinet, mobile operation panel, etc., which can be handled by partially raising them
3. If water has entered, please disassemble the computer, drive, motor and surrounding electrical components that are involved in the water, and rinse with clean water to remove surface dirt and impurities
4. Then process each part separately

How to deal with the hidden danger of water ingress in the electric cabinet

1. Take measures to prevent the backflow of rainwater, take measures to drain the cable trench and block fire prevention. Also consider whether the electrical cabinet needs to be temporarily heightened and waterproofed.
2. Increase the threshold at the door of the power distribution room. A small amount of water seepage in the cable trench is not a big problem, because the cable surface material is waterproof. The cable trench should be covered with a cover plate to prevent the large-area water-filled cables from being soaked in water.
3. In order to prevent the phenomenon of short-circuit bombing, power outage measures should be taken immediately, and the main power supply should be cut off and sent to guard. Note: If there is water around the power distribution cabinet, do not use your hands when the power is cut off, use insulating rods or dry wood, wear insulating gloves, wear protective glasses, and stand on insulating mats to prevent electric shock accidents due to huge arcs.

What to do if the power distribution cabinet is flooded after rain

1. The appearance of the electric control cabinet needs to be checked first. If there is obvious moisture or water immersion, the power cannot be sent immediately, and a professional electrician must do the following inspections:
   a. Use a test pencil to check whether the electric control cabinet cabinet is live.
   b. Check whether low-voltage components such as control lines, control circuit breakers, intermediate relays, and terminal blocks inside the electric control cabinet are damp. If damp, dry them with drying tools in time. For components with obvious rust, Replacement is required.
2. Before the electric cabinet is powered on, it is necessary to test the insulation of each load cable, and the phase-to-ground must be qualified. If the rated voltage of the stator is below 500V, use a 500V shaker to measure the insulation value. The insulation value is not less than 0.5MΩ. Every element in the cabinet Devices are dried and air-dried.
3. Inverter water treatment method:

First of all, let me tell you clearly that it is not terrible for the inverter to be flooded. What is terrible is that it is almost hopeless if it is flooded and then powered on. It is a blessing in misfortune that it does not explode.

Secondly, when the frequency converter is not powered on, water ingress can be completely handled. If water enters during operation, although the damage to the frequency converter is a foregone conclusion, it must be powered off immediately to prevent its internal circuits from burning and causing a fire. At this time, attention should be paid to the fire prevention measures in place! Then let’s talk about how to deal with water ingress when the inverter is not powered on. The main steps are as follows:

1) Absolutely do not power on, first open the operation panel of the inverter, and then dry all parts of the inverter;
2) Dry the display, PC board, power components, fan, etc. of the inverter with a hair dryer and cold air. Hot air is not available at this time. If the temperature is too high, it is easy to burn out the internal components of the inverter;
3) Scrub the components in step 2 with alcohol containing 95% ethanol, and then continue to dry them with cold air with a hair dryer;
4) After drying in a cool and ventilated place for an hour, scrub them with alcohol again, and continue to dry them with cold air with a hair dryer;
5) Alcohol volatilization will take away most of the water. At this time, you can turn on the hot air (low temperature gear) and blow the above components again;
6) Then focus on drying the following inverter components: potentiometer, switching power supply transformer, display (button), relay, contactor, reactor, fan (especially 220V), electrolytic capacitor, power module, must be low temperature for many times For drying, switching power supply transformers, contactors, and power modules are more important;
7) After completing the above six steps, pay attention to check whether there is any water residue after the inverter module is dried, and then check again after 24 hours for any damp places, and dry the key components again;
8) After drying, you can try to power on the frequency converter, but you must ensure that it will be disconnected once it is connected, and then observe the reaction of the frequency converter. If there is no abnormality, you can power it on and use it!

If a customer says that I can’t disassemble it, what should I do? Then wait a few more days and let him dry naturally. After drying completely, use filtered compressed air to blow the inverter circuit board through the gap to prevent the dirt left in the rainwater. On the circuit board, it causes poor heat dissipation during operation, and the alarm stops.

To sum up, as long as the inverter is not energized when it enters the water, the inverter is generally not damaged. Other electrical components with circuit boards such as PLC, switching power supply, and air-conditioning system can refer to the above method.

4. Motor water inlet treatment method:

1) The motor should be removed and the power cord of the motor should be wrapped, the motor coupling, wind cover, fan blade and front and rear end covers should be removed, the rotor should be taken out, the bearing cover should be opened, and the bearing should be cleaned with gasoline or kerosene (if the bearing is found When the wear is serious, it should be replaced), oil the bearing. In general, the amount of lubricating oil is one-half of the bearing for 2-pole motors, and two-thirds of the bearing for 4- and 6-pole motors.

2) Check the winding of the stator. Use a 500-volt megohmmeter to check the insulation resistance between the phases of the winding and the relative ground. If the insulation resistance is less than 0.5 megohm, the stator winding must be dried, and the winding is oily. It can be cleaned with gasoline. If the insulation of the winding has aged (the color turns brown), the stator winding should be preheated and then painted with insulating paint, and then dried. Drying method of the motor:
Bulb drying method: use an infrared bulb to face the winding, and heat one or both ends at the same time;
Electric furnace or coal furnace heating method: put an electric furnace or coal furnace under the stator, and it is best to separate the furnace with a thin iron plate for indirect heating. Put an end cover on the stator and cover it with a sack. Turn the stator over and continue to dry, but pay attention to fire prevention, because the volatile gas in the paint and paint is flammable;

5. The motor has no water ingress but is damp. Treatment method:

水分はモーターの故障を引き起こす致命的な要因です。雨が跳ねたり、結露による湿気などがモーター内部に侵入する場合があります。特にモーターが間欠運転の場合には注意が必要です。数か月間駐車した後は、使用前にコイルの絶縁状態を確認してください。そうでないとモーターが焼き付いてしまう可能性があります。モーターが湿っている場合は、以下の方法をお試しください：
1）温風循環乾燥法：断熱材（耐火レンガなど）で乾燥室を作り、上部に排気口、側面に吸気口を設けます。乾燥室内の温風の温度は約100℃に調整します。.
2）電球乾燥法：大出力の白熱電球（例えば100W）を1個または複数個、モーター内部の空洞に設置して乾燥させます。注意：電球がコイルに近すぎるとコイルが焼ける恐れがありますので、コイルから十分離して設置してください。モーターの外殻は帆布などで覆い、保温することも有効です。.
3）乾燥剤：
(1) 生石灰乾燥剤。主成分は酸化カルシウムで、化学反応により水分を吸収しますので、吸水は不可逆的です。外部環境の湿度に関係なく、自重の35%以上の水分吸収能力を維持できます。低温保管に適しており、乾燥効果が優れており、価格も比較的安いです。.
(2) シリカゲル乾燥剤。これは湿気を通す小さな袋に包装されたさまざまな種類のシリカゲルです。主原料であるシリカゲルは、微細な多孔構造を持つ水和シリカです。無毒、無味、無臭で化学的性質が安定し、強い吸湿性を持っています。価格は比較的高めです。.

4）自己発熱式空気乾燥法：工具やモーターの取り扱い経験がない方にも適していますが、時間がかかります。この方法では、通電前に必ずモーターの絶縁性能をテストしてください。.

また、機器内にまだ水が残っているため感電の危険を避けるために、設備が完全に乾燥したことを確認した後、1週間ほど風通しが良く乾燥した場所に置いてから使用し、機器全体の接地線が水によってショートしないようご確認ください。.

もし自分で対処できない状況に遭遇した場合は、より深刻な機器故障を防ぐため、当社へ点検・メンテナンスのご依頼をお勧めします。.