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2022
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03
Common faults and maintenance methods of valve motors
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Low protection level:
The valve motor provided by DENSO is a fully enclosed squirrel-cage structure and self-cooling with short-term intermittent duty (10min). According to the requirements of GB4942.1-85, the protection level is IP44 and the protection level is IP68. Different valve operating conditions and environments require different protection levels. A low protection level will cause the motor cavity to be wet or dust and other foreign objects intrude, and the motor insulation resistance will drop and cause damage.
Improper packaging, transportation and storage:
The valve electrical packaging should be protected from rain, moisture and dust, and the packaging should be firm and reliable. Rainproof measures should be taken during transportation, and the products should be stored in a ventilated and dry place after arriving at the site, and should not be stored in the open air. It is forbidden to debug or overhaul in rainy weather. After debugging, all fasteners should be tightened to ensure tight and reliable sealing of all electrical parts.
Improper control of valve electrical equipment selection and stroke position adjustment:
The valve is electrically equipped with two important parameters.
1. The opening and closing torque value should include the actual working torque value of the valve plus the torque value of the valve itself. The opening and closing torque value affects the use of the valve. There should be enough margin in the selection and matching (generally, it is required to be 1.1 to 1.3 times larger than the actual operating torque value of the valve).
2. The stroke position control is related to the size of the valve diameter, the length of the opening and closing time, and the structure. The motor matched with the valve electric equipment is a special motor, with a short-time working system, and the time is 10-15min. If the load is high in a short working time, the insulation level of the motor will decrease and cause damage.
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Wannuo
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Qianjiang Village, Ganjiang Town, Yuhuan City, Taizhou City, Zhejiang Province
