Application of Emerson ev3500 inverter in Chengde

Application of Emerson ev3500 frequency converter in Chengde Steel Works

Abstract: This paper analyzes the application of sm-profibus-dp bus interface module and upper computer communication in ev3500 frequency converter, and analyzes the method to solve the problem and how to set parameters

key words: ev3500 frequency converter; Sm-profibus-dp bus interface module; Parameter setting

Abstract: This text analyzed the application of SM-PROFIBUS-DP bus interface module and position machine communications in EV3500 frequency converter. And it also analyzed the solutions to problems and how to set the parameter.

Key words: EV3500 frequency converter; SM-PROFIBUS-DP bus interface module; parameter setting.

I. Introduction

site overview:

complete electrical project in steel-making area of vanadium extraction project of Chenggang: 4 sets of Aisheng evt4000p frequency converters are used for No. 2 oxygen lance high-pressure water supply pump, which is an important equipment for steel-making water supply. The field operation control mode is sm-profibus-dp bus mode. In the past, the high-pressure water supply of oxygen lance was realized by high-voltage motor, so this design uses AI Yisheng ev3500 frequency converter and low-voltage frequency conversion motor

purpose:

1 Ev3500 frequency converter is used together with variable-frequency motor to replace high-voltage motor (because the accuracy of high-voltage motor driving oxygen lance high-pressure water supply pump to control water pressure and lift is not high)

2. Improve work efficiency, save energy, realize unattended and upper computer operation control

3. Simple daily operation and convenient maintenance

field configuration requirements:

frequency converter: evt4000p4 sets

frequency conversion motors: 355kw4 sets, insulation level: Level B

auxiliary drive is realized by a SPLC and configured with an et200 remote i/o sub station

the system is configured as 3 for use and 1 for standby, and is controlled by sm-profibus-dp bus mode. Both local and automatic are controlled by the upper computer, which is convenient and simple to operate

II. Determination of the overall scheme:

ev3500 inverter has many ways to control the pump load in practical application, and all of them can meet the requirements of the process

1. Switching value control

2. Analog quantity control

3. Bus communication control and other control methods

switching value control is easy to cause misoperation and increase the working intensity of operators

considering the long distance between the main control room and the inverter cabinet, the analog control will be attenuated due to distance restrictions and strong current interference, which will increase the fault contact between the equipment and is not convenient for equipment maintenance

using sm-profibus-dp communication control can make up for the shortcomings of the above two control methods, realize unattended operation, and control line maintenance is simple and convenient. Only one 2-core DP cable can meet the start and stop control of ev3500 frequency converter, the feedback of frequency converter operation status, remote fault reset and other requirements, and make full use of the powerful advantages of ev3500 communication

single line diagram of communication between upper computer and inverter sm-profibus-dp module

III. electrical application scheme:

according to the requirements of control mode, the inverter cabinet is designed as follows

each evt4000p inverter is composed of three spma1402 110/132kw parallel machines. One PROFIBUS interface module is optional

this system uses Siemens' S7 Series PLC to communicate with Emerson ev3500 frequency converter. We provide the corresponding D file configuration in the application program of the upper computer and SM_ profibus_ dp_ user_ F file is used as a comparison table for instruction analysis, which is connected with the Profibus interface module for communication, and is controlled by sending the "control word" of the upper computer and reading the "status word" of the frequency converter

electrical schematic diagram (I)

electrical schematic diagram (II)

IV. ev3500 debugging process:

Step 1: correctly set the motor nameplate parameters and motor self-tuning

pr0.42 = 4

pr0.44 = 380V

pr0.45 = 1450r/min

pr0.46 = 621a

pr0.47 = 50Hz

there are two kinds of self-tuning for the motor.Setting mode, static and rotating self-tuning. If possible, the incoming line rotation parameters can be adjusted, so that the power factor of the motor can be measured

if the motor is loaded and the load on the motor shaft cannot be removed, the static parameter identification can be performed. Static parameter identification measures stator resistance (pr5.17) and voltage bias (pr5.23), sets pr0.40=1, and provides the frequency converter with enabling signal (terminal 31) and running signal (terminal 26 or terminal 27)

rotation parameter identification can be performed when the motor is unloaded. Due to the newly-built equipment in the steel-making system, the conditions for no-load commissioning of the motor are available. A few seconds before the drive motor rotates forward with a 2/3 base (regardless of the speed setting value and the selected direction), the rotation parameters first perform static parameter identification. In addition to measuring the stator resistance (pr5.17) and voltage bias (pr5.23), the rotation parameter identification also measures the motor power factor and pr0.43 is the correct value. Set pr0.40=2, and provide the frequency converter with enabling signal (terminal 31) and running signal (terminal 26 or terminal 27)

after the parameter identification test, the frequency converter will enter the "INH" state. The frequency converter must be in "INH" state before the set value of the frequency converter operates

the second step is DP network detection

the start and stop of the frequency converter, and the operating frequency is controlled by the upper computer. The quality of DP cable connecting upper computer and PROFIBUS interface module is particularly important. Enable the terminal resistance of the connector of the upper computer CPU. As the end device of the DP network, our frequency converter also enables the terminal resistance in the connector of the DP cable of the terminal PROFIBUS interface module. Use a multimeter to measure the resistance between the incoming terminals A1 and B1 of the terminal connector. The resistance value should be 142 Ω (including the resistance value of the wire diameter). When the terminal resistance of the terminal connector is turned off, the resistance value of the measured terminal resistance should be 262 Ω, It shows that the application method 1 of the inverter impact testing machine is well connected with the upper computer network. It can communicate normally and set the parameters of the frequency converter

if the resistance value is greater than 262 Ω, there is a problem in the DP network connection. Check whether the connection of the DP cable connector is loose, whether the position of the incoming cable and outgoing cable is correct, whether the red line of the cable corresponds to A1, A2, and whether the green line of the cable corresponds to B1, B2, and whether there is a break in the middle of the line

after confirming that the DP cable is correct, set pr15.03=10 communication address to be the same as the upper computer address

check pr15.06= -1. If pr15.06= -3 communication with the upper computer is interrupted

check whether the frequency converter can be read on the program screen of the upper computer, and set the communication between the frequency converter and the upper computer correctly

the third step is to set the relevant operating parameters of ev3500 frequency converter for preliminary on load trial operation

1. Pr5.14= Fd

2. Pr5.27= off slip compensation off

3 Pr6.01=coast (free parking) RP deceleration parking

4 Pr6.42=128 stop command (upper computer polyurethane: issued by the rising star of lightweight materials)

5 Pr6.43=on control word connection status

6 Pr7.15=volt (trip th thermistor fault)

7 Pr7.22=401

8. Pr7.23=1.400

9. Pr7.24=2 output ma

10 Pr8.17= take the reverse fault output (control terminal 41 #, 42 # is the fault output)

11 Pr15.01=403

12. Pr15.02=3.01

13. Pr15.03=10 the communication address is the same as the upper computer address

14 Pr15.04= -1 (after all parameters are saved, the parameter value of normal communication changes to 9)

15 Pr15.05= 0

16. Pr15.06= -1 (waiting for PLC communication, baud rate 9600=1, baud rate 1920=70)

17 Pr15.07= 3000 (the frequency converter stops automatically after 3s of upper computer power failure)

18 Pr15.08= OFF

19. Pr15.09= OFF

20. Pr15.10= -1

21. Pr15.11= -1

22. Pr15.12= 401

23. Pr15.13= 1001

24. Pr15.14= 1002

25. Pr15.15= 0

26. Pr15.16= 0

27. Pr15.17= 0

28. Pr15.18= 0

29. Pr15.19= 0

30. Pr15.20= -1

31. Pr15.21= -1

32. Pr15.22= 0

33. Pr15.23= 0

34. Pr15.24= 0

35. Pr15.25= 0

36. Pr15.26= 0

37. Pr15.27= 0

38. Pr15.28= 0

39. Pr15.29= 0

40. Pr15.30= OFF

41. Pr15.31= OFF

42. Pr15.32= off (parameter optimization, flash instantly, no on state can be seen)

43 Pr15.33= OFF

44. Pr15.34= ON

45. Pr15.35= local serial number code

46 Pr15.38= 4

47. Pr15.39= 4 (after all parameters are saved, the communication is normal, and the power-off restart parameter value becomes 6)

48 Pr15.40= 4 (after all parameters are saved, the communication is normal, and the parameter value of power off and restart becomes 6)

49 Pr15.41= 0

50. Pr15.49= 0 (when 15.06= -3, 15.49=113 or 111 frequency converter cannot start. Communication failure)

51 Pr15.50= 0

52. Pr15.50= 1

precautions for setting parameters:

after all parameters are set and saved, the frequency converter is powered off and then powered on again to check the display status of parameters pr15.06 and pr15.49. When pr15.06= -3, pr15.49=111 or 113. This indicates that the communication of the frequency converter is faulty. Check the DP line

when pr15.06= -1, pr15.49=0, the frequency converter waits for communication with the upper computer

when pr15.06= 1, pr15.49=0, the communication is normal, and the baud rate is 9600bps

when pr15.06= 70, pr15.49=0, the communication is normal, and the baud rate is 19200bps. When the communication is normal, the frequency converter automatically detects the baud rate of the upper computer

when the display value of parameter pr15.06 flickers frequently, it indicates that it can communicate with the upper computer to query the baud rate. Just initialize the center of gravity with pr15.32=on

parameter pr15.10 - pr15.19 provides the upper computer with the "status word" of the frequency converter. The upper computer displays the frequency, current and working state of the frequency converter on the screen by reading pr15.10 - pr15.19, from 15 19 the setting must be continuous and the RO parameter in pr0.00-pr21.51. Setting other parameters or RW parameters cannot be recognized by the upper computer

v. problems in commissioning

1: initial setting, pr15.12=505, pr15.13=506, pr15.14=507

after the operation of the frequency converter, the upper computer can only see the value of the DC bus voltage of the frequency converter, and the frequency and rated current of the motor can't be seen. After several settings and debugging, it is found that the parameters set by pr15.12 - pr15.19 can only be read for RO parameters in pr0.00-pr21.51, but cannot be read for RW parameters. There are unused "status words" that use "0" to occupy positions. Through the communication with the on-site process, finally put the parameters pr15.12= 401, pr15.13= 1001, pr15.13= 1002

2: the most noticeable problem in commissioning is the motor problem found in operation:

during commissioning, it is found that the No.2 oxygen lance high-pressure water supply pump is in no-load state, the operating current is 140A at frequency =40hz, and the rotating speed =1140r/min is normal. When running with load, the operating current is 145a when the frequency =40hz, and the controller of the frequency converter displays the speed =1150r/min. The actual speed of the motor on site is very low, and it is still in this state after several trial runs. It is certain that there is a problem with one of the frequency converters or motors. Considering that the insulation grade of the motor is grade B, it is doubtful whether it is due to poor insulation or poor cable insulation. Take off the U, V and W three-phase cables of the frequency converter, and measure the insulation between the cable and the motor housing with a 500m Ω "meter. It's OK. Through the conducting cable, it was found that the other motor driven by the 2# frequency converter was normal. Finally, the motor manufacturer came to the site to open the cover and detect the motor. It was found that the motor rotor was not handled well in technology, and a small iron block was not handled, leading to serious magnetic flux leakage when the motor was running

precautions:

in the communication state, ev3500 frequency conversion