Valve motor fault analysis

Low degree of protection: Electrical assembly of the valve motor for the whole closed squirrel-cage structure, short-term intermittent work system (10min) self-cooling. According to GB 4942.1-85 requirements, the minimum level of protection IP44, the highest level of protection IP68. Valve conditions and the use of different environments, the required level of protection are also different. Low degree of protection will cause the motor inner cavity damp or dust and other foreign intrusion, motor insulation resistance damage caused. Improper packaging, transportation and storage: The electrical installation of the valve should be protected against rain, moisture and dust. The packaging should be firm and reliable. During the transportation process, rain prevention measures should be taken. The products should be stored in a ventilated and dry place after they arrive at the site, and should not be kept in the open air. Do not debug or overhaul in rainy weather. Tighten all fasteners after commissioning to ensure that all electrical parts are sealed tightly and reliably. Valve Dianneng selection and travel position adjustment control is not correct: There are two important valve electrical parameters. â‘  opening and closing torque value should include the actual value of the valve torque plus the value of the valve itself, the size of the opening and closing valve affect the use of the valve, the force is easy to break, the force is easy to leak. In the selection of matching should have sufficient margin (the general requirement is greater than the actual valve torque 1.1 to 1.3 times). â‘¡ travel position control and valve size, opening and closing length of time and structure and so on. Valve electrical assembly of the motor for a dedicated motor, short-time working system, time 10-15min. Such as short-term working hours of high load, resulting in reduced thermal insulation level caused damage to the motor. Valve does not match with the motor model: the selected model does not match with the requirements of the electrical equipment, the actual output torque does not leave enough corresponding margin, overloading operation can easily lead to motor damage. Electrical protection failure, the quality of electrical components is poor: the micro-switch valve electrical equipment is the key components of the control mechanism, when the valve exceeds the stroke position, the micro-switch off the power supply, overload protection. Most Denso manufacturers trip and torque protection in series together, when the super-stroke or overtorque, the micro switch promptly cut off the AC contactor coil control power, thus cutting off the main circuit of the motor. Improper use of debugging and installation: â‘  valve electrical installation is divided into horizontal and vertical installation of two. When mounted vertically, the rear end of the motor is below. In the threading sleeve rubber seal failure, the cavity of the grease through the cable outlet into the motor cavity is easy to make the winding short circuit and burn the motor. â‘¡ According to JB 8528-1997 provides that the hand wheel rotation direction of the electric device should be consistent with the direction of rotation of the output shaft, clockwise off valve, counterclockwise to open the valve. If the motor does not match the actual direction of rotation and the need to replace any two-phase three-phase power supply (the transfer can be). Otherwise, the motor will be damaged due to the failure of protective measures due to the reverse phase. â‘¢ Because the valve motor is a high load short-time working system. If the continuous debugging time is longer than the rated time, causing the motor heat damage. Valve electrical equipment and valve connections do not match: Multi-turn valve electrical equipment is divided into two types of torque and thrust. Most of the torque for the three-jaw connection or key connection, the valve does not withstand electrical thrust axial thrust. Thrust type most of the threaded connection, can withstand greater axial thrust. In order to prevent the valve electrical connection between the valve and the valve must interfere with the valve must be limited to the upper surface and the valve with a suitable electrical installation gap. So that the worm shaft mounted on the output shaft does not shift position, to ensure that the worm gear meshing plane has a good meshing effect, to ensure that the transmission torque to achieve the rated output torque value. Motor temperature protection failure: the motor is equipped with temperature control switch, when the valve motor over the torque or long time operation, the motor temperature increases, the temperature exceeds the set value, the temperature control switch immediately cut off the control loop, play Protect the motor's role.

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