Siemens 6SE70 inverter common control method - Database & Sql Blog Articles

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First, the machine side control 1. Application range. The side control of Siemens 6SE70 inverter can meet the requirements of start, stop and speed regulation. According to the needs of users, it can also select the speed feedback and current feedback. The electrical components controlled by the machine, except the brake resistor placed outside the control cabinet and the start and stop buttons (SB1, SB2), selector knobs (SA1, SA2), ammeter, tachometer are placed on the door of the control cabinet, the rest of the electrical are placed In the control cabinet.
2. Application notes. Because the frequency converter is easy to generate high-order harmonics during operation, and the high-order harmonic current makes the energy exchange between the power supply and the load uninterrupted, and does not really work, the reactive power of the input circuit of the inverter is mainly high. The higher the component of the higher harmonic current generated by the subharmonic current, the lower the power factor. The way to improve the power factor is to connect an AC reactor in the circuit. In addition to improving the power factor, the AC reactor can suppress the inrush current in the input circuit and can weaken the current and voltage imbalance.
The machine side control has the following advantages: (1) Easy operation and intuitive control. (2) The line is simple, the construction is easy, and the maintenance is convenient.
Second, Siemens 6SE70 inverter hand / automatic control 1. Application range. This principle can meet the needs of inverter panel control and external hand/automatic control. Manual control of the side control, automatic control is the field bus system control, the inverter panel can also be controlled in the inverter room. In this design, the fieldbus system control is the main control mode, and the manual control is only used as a test and maintenance equipment or other special circumstances. Therefore, only the start and stop buttons are set next to the machine, and no speed control knob is provided. The fieldbus system can be started, stopped, speed controlled and connected to speed and current feedback.
2. Application notes. In the factory setting state of the inverter, the drive command is given by the control panel, the machine side, and the computer. When placed in external control, there are two external control methods: manual and automatic. The start/stop signal next to the machine (ie manual) is determined by SB1 and SB2 (SA1 is disconnected), and the manual setting is not required as a production requirement, so the parameter setting is given by the field bus system. The given signal is connected to the analog input, the computer start and stop signals are connected to the digital input, and the hand/automatic control is connected to the digital input, manually and automatically selected by SA1. The current and speed feedback signals are connected to the analog inputs. The start and stop signals are set to the on and off signals according to the corresponding parameters. The external reference is 4 mA to 20 mA, and the analog output is 0 mA to 20 mA.
Fieldbus system operation description: After the fieldbus system obtains the inverter preparation signal, it issues a start command. After the inverter runs, it gives a running feedback signal to the field bus system, and then the actual speed is adjusted by the field bus system according to the production site and actual needs.
Hand/automatic control has the following advantages: (1) simple operation, intuitive control and high precision; (2) simple circuit, easy construction and convenient maintenance; (3) hand/automatic separation, which is more conducive to tissue production.
The above several control methods, under different control requirements, have proven to be practical and can achieve good application results.