Customer's description of the problem: Mitsubishi FX2N-32MR-001, the PLC running light does not light up after powering on, and the alarm light is always on (hardware problem)
Detection and repair: Turn on the power supply, power on the PLC, according to the detection process, the CPU-E alarm light is always on after the PLC lights up the POWER light, and investigate the operation switch in the RUN position, but the RUN operation indicator light is not on, which can preliminarily judge that there is a software or hardware problem on the CPU board.
According to common sense, first through the computer software, the PLC program of the PLC memory is downloaded to the computer, and saved, and then performed once in the compilation software GX-Developer, the process is online - eradicating the PLC memory - selecting PLC memory, data soft components, bit software components - fulfillment, investigating the CPU-E light is still on, and it can be judged that the CPU board of the PLC has hardware problems.
There is a certain degree of difficulty in the hardware repair of the CPU board, because the external technology of each manufacturer is secret, and the CPU chip is difficult to buy on the market, so it can only be confirmed step by step on the premise that the peripheral circuit is not faulty, and the problem can only be replaced in most cases in the CPU chipThe online measurement of capacitance is more complicated, the method of replacing one by one is adopted, after each replacement of a capacitor, perform a removal of PLC memory operation, when replacing a small capacitor and then eradicating PLC memory, the alarm is eliminated, the test program is downloaded, the whole machine is tested, all are normal, and the machine is corrected.
|
More on that
|
OC troubleshooting method reported during inverter operation
1. For the test of the power output capacity of the driving circuit, to detect the pulse terminal signal such as GU\EU, it is not possible to have voltage (or pulse waveform) alone, and the current output capacity should be detected, and then admit whether it is normal;
2. Admit the defects of the current transformer. My solution is to use the ...
|
|
PLC Reasonable Programming to Eliminate Misoperation - Mitsubishi
(1) Eliminate finger tremor: use the differential instruction DIFU (13) to retrieve the rising edge of the button to send the electrical signal, and the PLC only executes it once in an execution cycle, and then prevent such misoperation;
(2) Unconscious operation:
(1) Optimize the display function and use different fingers...
|
|
Introduction to Mitsubishi PLC Modbus communication and address allocation
When using Modbus communication in Mitsubishi PLCs, it is necessary to understand the address allocation of different register types.
The following are the common types of Mitsubishi PLC Modbus addresses and their corresponding functions:
1. Coil Register: ...
|
|
There is no self-locking reason for the Mitsubishi servo motor to be turned on
In some cases, when the user first touches the use of the Mitsubishi servo motor, it may appear that the Mitsubishi servo motor is not self-locking after it is ready! So, what is the reason for this? And how to deal with it?
...
|
|
Mitsubishi PLC password protection settings
In GX Works3, there are three types of security settings: block password, security key, and file password. The block password is for the program to prevent others from reading and writing changes, only for the program; The file password is for the PLC to prevent others from reading and writing changes. Security keys are both capable of ...
|
|
Functional characteristics of Mitsubishi's various series of servo motors
Mitsubishi servo motor system series: MR-J2S series, MR-J3 series, MR-ES series, MR-E series.
Mitsubishi servo motor MR-J2S series
1. The product also has RS-232 and RS-422 serial communication functions, which can be used by a personal computer equipped with servo setting software.
|
|
Mitsubishi inverter encountered problems and solutions
1. If you want to use the inverter to drive the motor with a capacitor to improve the power factor, but the motor does not move, please explain the reason.
The current flowing into the inverter is used to improve the power factor, but the capacitor cannot be started because its charging current causes the inverter overcurrent (OCT), as a countermeasure, ...
|
|
Confirmation and clearing of Mitsubishi inverter alarm history
When the FR-CS80 inverter detects an abnormality, it will display an error message or alarm in the operation panel according to the abnormal content, or maintain the function action and block the output of the inverter. When maintaining a function operation, please deal with the cause of its operation before resetting the inverter, and then start working. ...
|
|
Mitsubishi participated in the 4th CIIE to introduce the E-JIT green induction solution
On November 5, 2021, the 4th China International Import Expo was grandly held at the National Convention and Exhibition Center in Shanghai. At the 4th CIIE, Mitsubishi Electric's booth was located in Hall 4.1 of the Technical Equipment Zone of the Convention and Exhibition Center, with an exhibition space of 400 square meters. At Mitsubishi Electric's booth, the high-profile event was ...
|
|
Mitsubishi Electric develops satellites for greenhouse gas and water cycle observations
TOKYO, March 30, 2020 – Mitsubishi Electric Corporation (Tokyo: 6503) announced today that it has been appointed by the Japan Aerospace Agency (JAXA) as the contractor for the Global Satellite Observing Satellite for the Greenhouse Gas and Water Cycle (GOSAT-GW), the third satellite in the GOSAT series, ...
|
|
Pay attention to the problem when choosing an inverter - Mitsubishi Electric
The current value of the motor is used as the basis for the selection of the inverter, and the rated power of the motor is only for reference.
Compared with the general squirrel cage motor, the winding motor simply has the problem of overcurrent tripping, and the slightly larger capacity than the usual ...
|
|
Installation and maintenance of Mitsubishi inverters
1. Mitsubishi inverter is more and more widely used because of a series of advantages such as wide speed regulation range, high speed regulation accuracy, fast dynamic response, high work efficiency, convenient operation and easy interface with other equipment. Because of the high common sense content of Mitsubishi inverter and the messy technology, how to use Mitsubishi inverter well...
|
|
Mitsubishi FX series PLC master control command
The FX2N has a total of 27 fundamental logic instructions, including 20 fundamental logic instructions of some sub-series PLCs.
Master Control Command (MC/MCR)
(1) MC (Master Control Command) for common tandem contacts ...
|
|
Mitsubishi PLCFX3U positioning control
Origin regression command with DOG lookup function
Mitsubishi PLCFX3U origin regression command with DOG lookup function: DSZR.
1. The workbench runs in the direction of the value reduction of the current value register (generally runs in the opposite direction M8342 ...
|
|
Analysis of PLC and inverter connection problems - Mitsubishi
When the inverter is used to form an active control system for control, in many cases, the PLC and the inverter are used together, and how to correctly connect the PLC and the inverter together has become the key to the success of the system.
1. PLC switch command signal input
Inverter input ...
|
|
Mitsubishi is a method for completing the modification of timer setting outside the PLC
In the process of using the PLC control system, it is often necessary to correct some parameters, and the most common is to correct the set value of the timer. In order to facilitate the operator to correct the set value of the timer, the following methods can be used:
1. The use of man-machine ...
|
|
Pay attention to the wiring of the Mitsubishi PLCI/O terminal
1. Enter the wiring
(1) The input wiring should generally not exceed 30 meters. However, if the environmental disturbance is small and the voltage drop is not large, the input wiring can be appropriately longer.
(2) The input/output lines cannot be separated by the same cable, and the input/output lines should be separated.
(3) As far as possible, choose normally open ...
|
|
The difference between a Mitsubishi servo motor and a stepper motor
First, the control accuracy is different
The step angle of the two-phase hybrid stepper motor is generally 1.8° and 0.9°, and the step angle of the five-phase hybrid stepper motor is generally 0.72° and 0.36°. There are also some high-performance stepper motors that have a smaller step angle after being subdivided. Communicate the control of servo motor ...
|
|
Mitsubishi servo motor jog forward and reverse
Control requirements: press and hold the forward rotation button, the servo motor rotates forward, release the forward rotation button, and the servo motor aborts the work. Press and hold the rotary button, the servo motor rotates, release the rotary button, and the servo motor aborts the work. When turning forward, pressing the turn button has no effect. When turning, pressing the forward turn button is invalid ...
|
|
Mitsubishi FX2N Series Extended PLC Module Selection Chart
|
|