Cool horse inverter in the crane industry application case

I. Introduction

With the progress of society, the performance of industrial automation products is increasingly strengthened, and the price is also declining due to the rapid development of electronic technology. The electrical control of the original equipment can be improved at a high cost performance. By adopting advanced control technology and driving technology, the operation of the equipment is more energy-saving, efficient, safe and reliable.

Second, the system control program

1, the control system function requirements:

Floating docking door crane as an example, used in a shipyard dock cargo handling.

Rated load capacity of 22 tons; Frequency increase motor rated power 75KW; Rated lifting speed of 30 m / min, 10 tons of light load, light load speed ≤ 30 m / min; non-light load speed ≤ 15 m / min , Required to meet the needs of continuous heavy work; the necessary hardware security protection; monitoring of the system operating parameters related to record.

2, hardware design

Control requirements for the system, the main control member is configured as follows:

a motor drive selection Cool horse Q9500-11044 vector inverter , together with the PG speed control card;

b programmable controller selection Japan's Mitsubishi FX2N-48MR type;

c inverter motor control requirements should be pre-installed 1024P / R incremental photoelectric rotary encoder;

d running surveillance recording equipment selection Japan's Mitsubishi FX-50DU-TK-C-type touch screen;

e fifth gear given the main header;

f Braking resistor rated at three times the power matching.

3, working principle

After system power-on, under the condition of no feedback, driver of driver's room gives operation instructions. PLC program will first send instructions to frequency converter according to instructions, and monitor the output torque of inverter to open the brake when starting torque value of brake-on, then Operating instructions to the speed of the file, light load speed ≤ 30 m / min, heavy load speed ≤ 15 m / min; run full fault monitoring, light fault sound and light tips, heavy fault emergency stop.

The motor running speed is fed back to the inverter by PG photoelectric encoder to form the closed-loop current vector control of speed feedback so as to achieve high-precision speed control and torque control; the PG card monitoring output divides into PLC high-frequency pulse input terminal for the program Speed ​​control and monitoring. Operating data and history are transmitted to the touch screen via RS422 serial communication interface for monitoring.

4, software design

PLC program is divided into two parts: one is the main lifting hook handling the main flow of cargo operation control, the key is to run the main command and speed command logic converted to three binary output to the inverter multi-speed input; And the PG card frequency input pulse SPD pulse speed calculation instructions with the inverter frequency divider parameters 61-06 and the motor speed is converted to meter / minute as the unit of data; the second is the PLC and touch screen interface program, the PLC In the touch screen to set up data reading area and the associated status flag for touch screen monitoring.

Touch screen monitoring screen configuration: In order to facilitate the driver to the operating conditions can be more accurate and accurate grasp, as well as staff to facilitate system maintenance, touch screen monitoring screen configuration with automatic switching of operating screen and historical fault records.

Third, the conclusion

The system from the equipment selection, design, installation commissioning into operation, completed successfully in a short period of time, running well, reaching the user's expected goal, running two years without failure, has been praised by users. For enterprises to create a great economic benefits, great promotional value.

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