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Electric control equipment of mine hoist

Full digital AC frequency conversion speed control system of mine hoist

 Full digital AC frequency conversion speed control system of mine hoist

1、 Executive Standards and regulations

  1. Full digital AC frequency conversion speed control system of mine hoist Coal mine safety regulations

2. Safety regulations for metal and nonmetal underground mines (GB 16424-1996)

3. Code for design of mine electric power (GB 50070-94)

4. Code for design of low voltage distribution (GB 50054-95)

(89) various protection and backup protection functions specified in Zhongmei zongshengli Zi No.128 document

6. Electromagnetic compatibility of industrial process measurement and control devices (GB / t13926-92)

7. Jb4263-86 technical conditions for electromechanical control equipment of AC drive mine hoist

8. Current Electrotechnical Commission and relevant standards

9. Electrical equipment shall comply with IEC standard of Electrotechnical Commission

10. The electromagnetic compatibility of electric control device conforms to the basic measurement method of industrial radio interference (gb3907-83) and the basic measurement method of anti-interference characteristics of electrical equipment (gb4859-84)

2、 System features:

1. Main loop control mode: full digital frequency conversion speed regulation, with enough margin for capacity selection.

2. Control loop mode: PLC programmable controller. It adopts new electric control system, full digital frequency conversion speed regulation, Siemens PLC control, the control principle meets the requirements of upgrading process, and has more perfect software and hardware protection links, and each main protection realizes double protection. According to the signal direction, the electronic control system can accelerate manually or semi-automatically, decelerate automatically and stop automatically.

Features: 1. Stepless speed regulation, stable and continuously adjustable speed;

Compared with the traditional rotor series resistance form, energy saving is significant;

(3) good technology represents the development direction of AC electric control of hoist;

 Full digital AC frequency conversion speed regulation system of mine hoist.jpg

(4) the technology is mature and has entered the promotion stage

(5) no noise and small floor area;

3. Features of main control equipment:

(1) the double circuit power supply incoming line has corresponding control, measurement and protection functions; the double circuit power supply incoming line adopts the working mode of one for use and one for standby.

(2) UPS device is set in the cabinet to supply power to control equipment and PLC, so as to ensure reliable safety braking and data maintenance of hoist after low-voltage power failure.

(3) frequency converter is used as digital speed control device to realize stepless speed regulation and stable speed operation; a large number of rotor resistance are cancelled, which can significantly reduce energy consumption and operation cost, and also reduce land occupation;

(4) it has strong anti-interference ability, strong environmental adaptability, small harmonic component and no pollution to the power grid; adopting vector control technology of frequency conversion, the actual speed changes closely with the predetermined speed, and the transition of speed diagram from constant speed section to deceleration section and deceleration section to crawling section is good, which has better speed regulation performance compared with DC drive hoist;

(5) the digital frequency conversion power supply device of mine hoist operates according to the "s" type given curve. Through the man-machine dialogue interface, it is convenient to use and debug. According to different use occasions, the parameters set are different;

(6) it has powerful internal software fault diagnosis function and external line fault diagnosis function. When the fault is diagnosed, the device will stop working automatically to prevent further expansion of the fault, and make accurate fault alarm.

3、 Security protection

1. Master control handle zero interlock 2. Brake handle zero interlock

3. Main circuit power failure protection 4. High brake oil pressure protection

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7. Deceleration over speed protection 8. Over winding protection

9. Deep finger shaft break protection 10. Spring fatigue, brake shoe wear protection

11. Rope loosening protection 12. Car sliding protection

13. Inverter failure 14. Rope adjustment interlock

15. Constant speed protection 16. 2m speed limit protection

17. Overload protection (overload protection) 18. Full bin protection

19. Oil temperature protection 20. High residual pressure protection of hydraulic station

21. Rope adjusting clutch failure protection 22. Under voltage protection


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