Category: Industrial control technology

Debugging, application, and maintenance techniques for industrial control products，Such as Variable speed driver(VSD),Variable frequency driver(VFD),Industrial touch screen,Programmable Logic Controller(PLC),Servo Driver,servo motor,servo amplifier,Servo Controller,etc.

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Testing Method for Offline Operation of Mitsubishi MR-J3 Servo Driver Maintenance Board

When repairing Mitsubishi servo drives, encountering damaged modules is common. After repairing such modules, it’s crucial to test the drive board’s output function offline before reinstallation. This article provides a detailed guide for testing a repaired Mitsubishi MR-J3-350A/3.5KW servo module.

Mitsubishi Servo MR-J3 Circuit Board Maintenance Test Diagram

Preparation for Offline Testing:

  1. Power Connection: Connect 300V DC voltage to power boards P2 and N to avoid E9 fault after power-on.
  2. Module Pad Hole Shielding:
    • Connect the 10 pins of the module pad hole to N.
    • Connect pad holes U, V, W to N to prevent AL24 fault.
    • Connect pad holes EV, EU, EW (upper axle drive trigger) to N.

Parameter Setting Before Running:

  1. Change PA01: Set PA01 to 0002.
  2. Change PD01: Set PD01 to 0000.
  3. Power Board Connection: Connect P and D on the power board.
  4. Additional Power Board Connections: Connect L1 to L11 and L2 to L12 on the power board.
    • If PD parameters are not visible, change PA19 to 000C and power on again.
Mitsubishi servo MR-J3 drive circuit actual pulse state

Testing Process:

  • After following the above steps, power on and run the servo to test its 6-way waveform.
  • During parameter waveform testing, manually rotate the motor shaft to observe changes in pulse width and phase in the waveform. Note that this machine does not have a static cut-off negative voltage.

By following this comprehensive guide, you can effectively test the offline operation of a repaired Mitsubishi MR-J3 servo driver maintenance board, ensuring its functionality before reinstallation.

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Method of changing IP and station name using BOP panel for Siemens VSD G120 series

The Siemens G120 series frequency converters basically support communication control, such as Profibus and profinet protocols. When it comes to modifying addresses and station names, they are usually rewritten using software such as TIA and STARTER, or modified through the super panel IOP-2. However, the manual does not mention how to modify these parameters through the BOP panel. After practical exploration, I found that the BOP panel can also modify these parameters, The method is as follows:

1、 The G120C PN type frequency converter uses profinet communication, but it can be started, stopped, and adjusted using the manual function (HAND/AUTO) of the panel, which can directly determine the quality of the frequency converter without passing through the network.

3、 P3 is set to 4 first, and the station name P8920 can also be configured using a simple panel like BOP-2, but the following cannot be configured:
P8921—— r8931 IP Address
P8922—— r8932 Default gateway
P8923- r8933 subnet mask
P8924—— r8934 DHPC mode

4、 In practical use, it was found that as long as the station name P8920 (with a total of 240 subscripts, corresponding to a maximum of 240 values) is set, such as IND [000], IND [001], IND [002]… IND [239] is actually an ASII value, it can be connected to the profinet. The P8921-P8924 on the top should not be ignored, and the upper level should have the opportunity to assign them additional values.

5、 Method for changing P8920 parameters in BOP-2
A. P8920=0, all its subscripts ind [000] [001] [002] until the corresponding value of [239] must be set to 0. Remember to press the OK key every time you modify one;
B. P8925=3, press the OK key to delete all IP configurations;
C. Power off the frequency converter for at least 20 seconds;
D. Power on again and re-enter the corresponding station name value (ASII) in P8920, [000] – [239], usually using 8.
E. P8925=2, power off for more than 20 seconds;

6、 BOP-2 can directly upload data other than the station name P8920-P892, such as motor current and power, and then download it to a new frequency converter. However, the parameters of P8920 can only be manually inputted according to the above process. Remember to set p971=1 after debugging and save the parameters (automatically changing to 0 after successful saving), otherwise the parameters will be lost after power outage.