For the starting of the water resistance cabinet, the following issues should be paid attention to in normal operation:
1.Before closing and starting, check whether there are foreign objects on or near the motor and dragging machinery to avoid personal and equipment accidents.
2. After the motor is connected to the power supply, if it is found that the motor cannot be started or the rotation speed is very low and the sound is abnormal, etc., the power supply should be cut off immediately, and the high-voltage asynchronous motor should be tested to check whether the rotation direction is correct.
3. When starting multiple motors, they should be started together according to the capacity from large to small, and cannot be started at the same time, so as not to cause the circuit breaker to trip due to excessive starting current.
4. For the star-delta starting or auto-decompression starting of the cage motor, if it is a starting device controlled by manual delay, attention should be paid to the starting operation sequence and the length of the delay. For the starting of wound motors. More attention should be paid to the start-up procedure and to observe whether the start-up process is normal. Otherwise, both motors cannot achieve the purpose of voltage reduction start.
5. Multiple motors should be avoided to start at the same time, and should be started one by one from the largest to the smallest, so as to avoid the total starting current on the line being too large and the voltage dropping too much, affecting the normal starting of all motors, and even tripping the switchgear.
6.The motor should avoid frequent starting or minimize the number of starts to prevent the motor from heating due to frequent starting and affecting the service life of the motor. For small motors, it should not exceed 3 to 5 times in the cold state, and in the hot state after long-term work, when restarting soon after shutdown, the continuous start should not exceed 2 to 3 times. For medium-sized motors, the continuous starting should not exceed two times in the cold state, and only one start is allowed in the hot state to prevent the motor from overheating. affect the service life. For motors whose starting time does not exceed 2 to 3 seconds, it can be started more than once.
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