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Correctly control the forward and reverse rotation of the motor
Release time:
2024-07-05
Can the motor be reversed? How to realize and control? The method of motor reversal is to change the phase sequence of any two-phase power supply connected to the motor stator winding on the basis of the forward circuit.
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Can the motor be reversed? How to realize and control? The method of motor reversal is to change the phase sequence of any two-phase power supply connected to the motor stator winding on the basis of the forward circuit.
For the control circuit diagram of the motor forward and reverse operation, in order to enable the three-phase asynchronous motor to reverse, two contactors KM1 and km2 are generally used to replace the phase sequence of the three-phase asynchronous motor. The motor phase is powered, but the two contactors cannot be sucked. If they are sucked at the same time, it will cause a short circuit accident of the power supply. In order to prevent the occurrence of such accidents, in general, should be used in the circuit reliable interlock.
In this regard, the specific analysis of the wiring diagram is as follows:
1. ongoing work:
1. Close the air switch QF and connect the three-phase power supply
2. When the forward rotation start button Sb3 is pressed, KM1 is energized and self-locking, the main contact is closed, and the motor is turned on. At this time, the phase sequence of the motor is L1, L2 and L3, I .e. forward rotation operation.
2. reverse start:
1. Close the air switch QF and connect the three-phase power supply
2. After pressing the reverse start button SB2, km2 is energized and self-locked through the auxiliary contact, the normally open main contact is closed, and the phase sequence of the three-phase power supply of the motor is replaced. At this time, the phase sequence of the motor is L3, L2, L1, that is, reverse operation.
3. internet links: online sections with banned features can also serve as security guards
1. Contactor interlocking: when KM1 coil circuit is connected in series with km2 normally closed auxiliary contact, km2 coil circuit is connected in series with KM1 normally closed contact. When the coil of the positive transfer contact KM1 is energized, the auxiliary normally closed contact of KM1 breaks the circuit of the km2 coil. If KM1 is to be energized and closed, km2 must be cut off and released first, and then its auxiliary normally closed contact must be reset to prevent phase-to-phase short circuit caused by simultaneous closing of KM1 and km2. The line link is an interlocking link.
2. Button interlocking: the method of forward and reverse transmission control circuit operated by control buttons is adopted in the circuit. The buttons SB2 and Sb3 have two normally open contacts and two normally closed contacts, which are connected to the loops of the KM1 and km2 coils respectively. For example, the normally open contact of the button SB2 is connected in series with the coil of the contactor Km2, while the normally closed contact is connected in series with the coil loop of the contactor KM1. The normally open contact of the button Sb3 is connected in series with the contactor KM1 coil, and the normally closed contact is connected in series with the km2 coil circuit. Thus, when SB2 is pressed, only the coil of contactor km2 is energized and KM1 is de-energized. When Sb3 is pressed, only the coil of contactor KM1 can be energized, and km2 is de-energized. If SB2 and Sb3 are pressed at the same time, both contactor coils will not be energized. Therefore, it plays the role of the Internet.
Note: KM1 and km2 coils cannot be energized at the same time, otherwise it is easy to cause a short circuit of the main circuit power supply. Once the operation is not normal, it is quite dangerous.
When the 4. motor is started (or running in reverse), you can directly press the reverse (or forward) start button, without pressing the stop button first, the motor will run in reverse.
The overload protection of the 5. motor is generally completed by the thermal relay fr.
motor reversible operation control wiring diagram:
6. motor reversible operation control circuit debugging
1, we generally check whether the main circuit wiring is correct. In order to reliably change the phase sequence of the motor when the two contactors operate, the upper port wiring of the contactor should be consistent, and the lower port of the contactor should be adjusted.
2. After checking that the wiring is correct, conduct power-on test. To prevent accidents, disconnect the motor wiring first.
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