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Diagram of Forward and Reversing Control Circuit of SIEMEN Inverters

2026-09-14 03:35
2026-09-14 06:12

Taking the SIEMENS MM440 as an example, the circuit structure and working principle of the forward and reverse control circuit of the frequency changer are as follows: 1. ** Circuit components and functions ** - ** Button-related ** - BUB1 button: used to power up the frequency changer. - BUB2: It is used to cut off the power of the frequency changer. However, when it is running, this button will not work due to the blockage of the running relay KA1 or KA2. Pressing this button during running is ineffective. - BUB3: Control the motor to start in the forward direction. - [BUB4: Control the motor to start in reverse.] - BUB5: Realizing the motor stop function. - ** Relays ** - KA1 relay: responsible for forward rotation control. - KA2 relay: responsible for reverse rotation control. KA1 and KA2 are interlocked. The forward and reverse rotation cannot be directly switched. The engine must be stopped before changing the direction. - ** Others ** - When the protection function of the frequency changer is activated, the power supply can be quickly cut off through the KO Contactor, and it is convenient to realize self-locking and interlocked control. 2. ** Circuit Design Points ** - The main function of the KM contactors was to control the power supply of the frequency changer. The operation and stop of the frequency changer were not controlled by them. During operation, the power-off button SSB2 is blocked by the operation relay KA1 or KA2. Contactor KO can quickly cut off the power supply when the protection function of the frequency changer is activated, and it can also realize self-locking and interlocked control. - The control circuit is connected to the alarm output contacts 18 and 20 in series. When the frequency changer fails and alarms, the control circuit is cut off, and the KM is disconnected, thus causing the frequency changer to stop. - The main command button is used to turn on and off the frequency changer and to control the forward and reverse operation of the motor. 3. ** Forward and reverse control of the frequency changer ** - ** Forward Rotation ** - After pressing down on SSB1, the KM coil was energized, the main contact was connected, and the frequency changer was energized into standby mode. At the same time, the auxiliary normally open contact of the KM made the KM coil self-lock. When he pressed down on SSB3, the coil of KA1 was energized, and its normally open contact KA1 was connected to the DIN1 terminal of the frequency changer, and the motor began to rotate forward. The other normally open contact of the KA1 is closed to realize the self-locking of the KA1 coil. The normally closed contact is broken, and the KA2 coil cannot be energized. - ** Reversal ** - If you want to reverse the motor, you need to press the SSB5 to stop the motor. Then, he pressed down on SSB4, and the KA2 coil was energized. The normally open contact KA2 was closed, and the REV terminal of the frequency changer was connected. The motor rotated in reverse. At the same time, the other normally open contact of the KA2 is closed to cause the KA2 coil to self-lock. The normally closed contact KA2 is disconnected, and the KA1 coil cannot be energized. - ** Stop ** - When it is necessary to cut off the power, first press down on SSB5 to make the KA1 and KA2 coil lose power. The normally open contacts are cut off (the motor decelerates and stops), and the bypass power supply to SSB2 is removed. At this time, press down on SSB2, and the frequency changer will be cut off. When the fault alarm of the frequency changer was triggered, the control circuit was cut off, and the main circuit of the frequency changer was cut off. Read more exciting novels for free

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