Product Introduction

S7-300 module ③, user program related instructions and documents. After updating the hardware catalog, you will find the DP slave in "PROFIBUS-DP>AdditionalFieldDevices". (3) Characteristics of DI template Transistor output modules can only carry DC loads and belong to DC output modules; thyristor output mode belongs to AC output module; relay contact output mode module belongs to AC/DC dual-purpose output module.

1. Introduction to Siemens DC controller 6RA70

At present, with the development of AC speed regulation technology, AC transmission has developed rapidly, but DC transmission speed regulation is still widely used in many occasions. With the development of computer technology, the past analog control system is being replaced by digital control system. In the general all-digital DC speed regulation device with microcomputer, without changing the hardware or making few changes, relying on software support, various adjustment and control functions can be easily realized. Therefore, the reliability and application flexibility of the general all-digital DC speed regulation device are significantly better than the analog control system. At present, the 6RA70 series universal all-digital DC speed control device of SIEMENS of Germany is the most widely used.

1.1 Structure and working mode

The SIMOREG 6RA70 series rectifier is a fully digital control device directly powered by a three-phase AC power supply. It has a compact structure and is used for the armature and excitation power supply of adjustable-speed DC motors. The rated armature current range of the device is 15 to 2000A, and the rated excitation range is 3 to 85A. It can be expanded by connecting SIMOREG rectifiers in parallel. After parallel connection, the output rated armature current can reach 12000A. The 6RA70 DC controller has been widely used in various industries. The core components of the controller have been proven by reliable examples at home and abroad, and the reliability and safety are relatively guaranteed.

With the advancement of modern science and technology and the continuous improvement of equipment by equipment manufacturers, electric transmission devices have been widely used in modern industrial production. However, the production department's requirements for its production process are also constantly improving, which makes our requirements for modern speed control systems higher and higher. The development of AC speed regulation technology has promoted the widespread application of AC transmission technology, but the current DC transmission speed regulation method still retains a place in some fields. Moreover, with the rapid development of computer technology, modern digital control systems have replaced the past analog control systems.

10. Optimization of excitation characteristics

Let P143 = motor * speed, P081 = 1, P051 = 27 for weak magnetic optimization operation.

Start the motor to high speed and check whether P038, P019, and P024 are stable.

After weak magnetic optimization operation, P169 = 0, P170 = 1 selects torque limit and torque control.

Record optimization results

6SE7038-6EK84-1GF0②, Data block (DB): used to store various I/O data of the system, intermediate values ​​of mathematical operations and logical operations, and transmission data between the host computer. Including shared data blocks, background data blocks and local data blocks. The data in the shared data block can be shared by all program blocks; the background data block is a data block corresponding to a certain function block, which mainly provides background data for the function block. Its data corresponds to the variable definition in the function block, but can also be read and written by other program blocks. The local data block can only be used by the function function or function block that defines it. ①, parameter sampling and processing module: corresponding to the input conversion part in the figure, responsible for parameter sampling and range conversion. Here, in "LoadmemoryRAM+EPROM", you can see the size of the allocated load memory. The digital input I2 of the function module FM350-1/FM450-1 is used to reset the counter to the initial value.

6ra70 replaces the CUD1 board

6ra70 replaces the CUD1 board. What's wrong with the power pack F058? What things need to be paid attention to when replacing the CUD1 board, such as: version. How to choose the model when replacing the CUD1 board

*Answer

Regarding fault F058, the parameter setting is inconsistent. The fault table in the manual has a clear explanation. If you can't reset the fault, then there is a problem.

This fault can be reset. If it doesn't work, use the Drive Monitor software to enter the parameters to view the fault value. There is a way to know what is wrong. Unless the CUD1 main board of the device is broken.

When replacing the CUD1 board, be sure to turn off the power before replacing the board. There is nothing else to pay special attention to.

Nowadays, the DC speed control system of the lathe used in the production department of the steel rolling company is that the AC motor (asynchronous machine) drives the DC generator to achieve alternating current, and then the relevant DC generator in the factory area supplies power to the target speed-controlled DC motor. The whole system is unreasonable and unscientific. In order to provide sufficient excitation power for the DC generator and the corresponding DC motor in the factory area, the production department must have a special DC excitation generator. To ensure that the power supply is not interrupted, I still remember that the DC speed control system powered by this unit was widely used before 1960. Most production plants produce according to this plan, but nowadays, due to the backwardness of the equipment, low production efficiency and frequent failures during production, this equipment has been in a semi-obsolete state. In order to improve the production capacity of the production equipment, we have carried out some related technical transformations on this system. In order to meet the needs of the company's production, the DC speed control system of the DC motor of the improved equipment adopts the DC speed control device of Siemens, the current leading equipment manufacturer.

Parts programming:

1. Standard G code programming (DIN66025) and Siemens high-level language programming

2. ISO standard programming

3. Turning and milling process cycle programming

4. Blueprint programming

5. Polar coordinate programming

6. Program memory capacity up to 340k bytes

PLC:

1. Adopt standard S7-200 programming language micro/win

2. Ladder diagram programming

3. Ladder diagram online display

4. PLC remote diagnosis

5. Fully Chinese PLC programming tools are provided

6. PLC subroutines and PLC application examples for lathes and milling machines are provided

7. The processing speed of PLC is 6000 steps/24 milliseconds

8. 40 timers, 32 counters

9. Digital input and output are 144 / 96

6SE7038-6EK84-1GF06SE7038-6EK84-1GF0Siemens Central China Agent

DI/DO signal. Figure 2-5 S7-300 configuration with reference potential (M) grounded Note that if you want to achieve reference potential grounding, you must not remove the jumper from the CPU. When resetting the CPU, the memory is not completely deleted. The entire main memory is completely deleted, but the data in the loaded memory and the data saved on the Flash-EPROM memory card (MC) or micro memory card (MMC) will all be retained. In addition to the loaded memory, the timer (except CPU312IFM) and the diagnostic buffer are also retained. CPUs with an MPI interface or a combined MPI/DP interface only retain the current address and baud rate used by the interface before the full reset. On the other hand, the other PROFIBUS address is also completely deleted and can no longer be accessed. Double-click Hardware to enter the HWCONFIG window.

Optimization

Armature and excitation current loop optimization

Put excitation, control, and fan power on

Select P051=25 on the PMU in the internal control state of the device

Select the input closing command and unblocking command on the rectifier device door when it enters or waits for operation. When the device state is <, the optimization operation starts. The optimization process must ensure that the motor is locked. At the end of the optimization operation, the drive device returns to the state. The whole process takes about 40S. The current limit will not work, and the current peak value is related to the rated current of the motor.

The following parameters are automatically set:

- P110 P111: armature circuit resistance, inductance

- P112: excitation circuit resistance

- P155 P156: armature current regulator P, I gain

- P255 P256: excitation current regulator P, I gain

- P826: correction of natural commutation time

Before optimizing the current loop, set P159=, P160=0 (default value). After the optimization, redefine P159, P160 as the following values ​​to ensure reliable commutation of the SCR positive and negative bridges. In the future, the two parameters need to be restored to the factory default values ​​before optimizing the current loop.

The higher the system model, the higher the system accuracy, but the relative stability will become worse and worse. Among them, the steady-state accuracy of the type 0 system is the lowest, while the systems of type ii and type iii are not easy to be stable in function and are almost not used in practical applications. In order to ensure a certain steady-state accuracy and relative stability, one of the type i and type ii systems is usually selected for reasonable design and is called a typical type i or type ii system.

6SE7038-6EK84-1GF0TD200 text display: a simple human-machine interface that allows operators to read information and enter commands when the PLC is running. These control characters activate the communication partner and check whether all data is received and whether there are no errors. 45: If the CPU is cut off, does the 2-wire measuring transmitter continue to be powered? The follow-up includes the selection of LT103, FT101, TE104TE105.

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