Switch Mode Power Supply (SMPS) will cause the base of the switch tube to fail to get the switching pulse and intermittently operate due to the short circuit of the load, the failure of the self-vibration circuit and the loss of control of the protection circuit, which makes it difficult to locate the shortcomings of SMPS. The difficulty of the repair operation is due to the improper method, which will expand the shortcomings and constitute the phenomenon of continuous burning of the switch pipe, so the author believes that the inspection of SMPS should isolate the circuit and check the location of the intermittent defects step by step.
Independent power supply, remove protection, check the shortcomings caused by the loadSMPS and linear regulated power supply are different, and the no-load condition is easy to break down the switch tube, therefore, when SMPS is damaged intermittently and repaired independently# the load and protection circuit are all disconnected together# must be carried with a false load on the power supply of the main load power supply group. The selection of false load according to the power supply power and test conditions, can be used incandescent lamp or electric soldering core, some people have written that the incandescent lamp as a fake load due to the cold state resistance is very small, the switch tube starting current is large, it is easy to constitute the switch tube damage A short test and theory of the support of the test and theory, the test and theory prove that the SMPS voltage regulation scale is wide, will not present the phenomenon of switch tube damage, and the light and dark of the incandescent lamp has the function of indicator, which is worth promoting. If the power supply can operate normally after the false load is connected, the load size or input voltage can be appropriately changed, and the power supply can have a stable output, the power supply can be judged to be intact, and the disadvantage lies in the load; On the contrary, the shortcomings are investigated in the second step of the power supply.
Independent vibration circuit, check the shortcomings caused by the voltage regulator circuit moduleAt present, SMPS does not deal with the "hot bottom" problem, and a large number of parallel optocouplers are used to control the voltage regulator SMPS, when the suspect voltage regulator circuit presents a problem and SMPS is intermittently operated, the two control pins of the hot ground end of the optocoupler can be disconnected # and a 10k variable resistor is connected at the original pin, so that the vibration circuit is independent, and the influence of the voltage regulator circuit on the switching circuit is cleaned, but the safety method of low-voltage power supply should be selected, When SMPS can start normally and there is a voltage output, it can be cleaned The vibration circuit presents a shortcoming, the shortcomings are in the voltage regulating circuit, the problem is mostly the comparison with the damage caused by the damage caused by the optocoupler, most of the damage will cause the optocoupler to be damaged together, if there is no voltage output, it is indicated that there is a problem with the vibration circuit part.
Gradually restore the protection circuit, check the shortcomings caused by the protection circuit moduleSMPS introduces over-current protection, over-voltage protection, under-voltage protection, and over-temperature protection
While protecting the SMPS itself safely, it also avoids damage to other operating circuits caused by the shortcomings of the SMPS. Most of the overcurrent sampling points of the overcurrent protection circuit are at the emitter potential of the main vibrating power tube. According to the voltage after AC rectification filtering or the power supply voltage of the main load, the sampling point of the overvoltage protection circuit is intermittently sampled and judged by the Zener diode & stable voltage tube.
The sampling point of the short-circuit protection circuit is generally intermittently sampled by the diode to the power supply of the low voltage group of the output of the regulated power supply, and a "latching circuit" is arranged inside the power supply selected by some equipment, and the "latching circuit" is a protection execution circuit in practice, and the intermittent control of the intermittent circuit is based on the signal transmitted from each sampling point. After cleaning and operating normally after ensuring that the defects of the vibration circuit and the stable circuit are cleaned, one protection is added before the protection is activated, and the defects of the power supply can be determined by what kind of protection circuit is introduced.
|
More on that
|
The cause of motor burnout caused by inverter - LS generates electricity
In fact, the problems of the motor are not the cause of the motor itself, most of them are caused by the non-standard debugging of the inverter or the wrong inverter motor when the inverter motor is used, etc., mainly due to the following situations:
1. Put the general motor ...
|
|
Inverter external potentiometer connection method - LS power generation
The two wires are connected to the resistor, and the other wire is connected to the adjustment terminal.
The red thread is attached to the blackhead and inserted in a small hole.
Connect both ends of the IR potentiometer to +10V and ACM, and slide the termination to the voltage input terminal AVI.
...
|
|
The role of contactors in industrial electricity - LS generates electricity
The contactor is an automatic switch in industrial electricity that uses a button to control its on/off. The contactor consists of an electromagnetic coil, a static armature, a moving armature, a static contact, a moving contact and a fixing bracket. The principle is that when the electromagnetic coil of the contactor is connected to the communication electricity, a strong magnetic field will be generated to make the center of the coil ...
|
|
The principle and function of the power production contactor
The working principle of the power production contact is: when the contact coil is energized, the coil current generates a magnetic field, and the generated magnetic field leads the static iron core to produce electromagnetic attraction to the iron core, and drives the AC contact action, the normally closed contact is disconnected, the normally open contact is closed, and the two are connected to each other. When the coil is de-energized, the electric ...
|
|
LS power generation low-voltage universal inverter vector control mode
The method of vector control frequency conversion speed regulation is to change the stator current Ia, Ib, Ic of the asynchronous motor in the three-phase coordinate system, after the three-phase - two-phase change, equivalent to the communication current Ia1Ib1 under the two-phase static coordinate system, and then after the directional rotation according to the rotor magnetic field, it is equivalent to synchronous rotation sitting.
|
|
Inverter failure and solution - power generation
1. HW problem
This problem may be a fault unique to LG-IG5 series inverters, and the main causes are as follows:
(1) Damage to the cooling fan. Due to the use of environmental and other factors, the friction of the fan bearing is too large, causing the fan load to be too large and showing H ...
|
|
The wiring distance between the motor and the inverter
Burn two new motors in a row! The output current and voltage of the inverter are balanced, the input voltage is balanced, the current is unstable, and the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, the interval between the motor and the inverter is 120m, and the input and output terminals of the inverter are powered ...
|
|
LS inverter series and its features
LS inverter, the full name of LS communication frequency conversion governor, after supplying a variety of equipment, converts direct current into communication electricity, and changes the voltage and frequency of ordinary power supply input to control the speed of the motor, to meet different industrial needs, and then complete the energy saving and environmental protection of the automation system. ...
|
|
Single-table driver for HLP2B
|
|
Reasonable selection of LS inverter
The selection of the inverter should be considered according to the type of controlled object, speed regulation scale, static speed accuracy, starting torque, etc., so that it is easy to use and economical together with the satisfaction of process and production requirements.
1. Inverter and the motor to be operated
(1) The number of poles of the motor. General motor ...
|
|
Introduction of LS power products
1. Power-related products: medium, low and high voltage electrical products;
(1) Low Voltage Products: Molded Case Circuit Breaker, Air Circuit Breaker, LS Contactor & Overload Relay, Miniature Circuit Breaker, Dual Power Automatic Transfer Switch, Intelligent Motor Protector, Manual Motor Starter, Surge Protection ...
|
|
Analysis of the working principle of the inverter - LS power generation
The rectified DC voltage of the rectifier contains the pulsating voltage of the power supply 6 times the frequency, and the pulsating current generated by the inverter also changes the DC voltage.
The main power is the power replacement part of the power supply for the asynchronous motor voltage regulation and frequency modulation power supply, and the main power of the inverter can be roughly divided into two ...
|
|
PLC installation and wiring skills - LS power generation
The PLC should be kept away from strong disturbance sources such as electric welding machines, high-power silicon rectifier equipment and large-scale power equipment, and cannot be installed in the same switch cabinet as high-voltage electrical appliances.
Power cables, control cables, and PLC power cables and I/O cables should be separated from the wiring ...
|
|
LS static test to determine the fault of the inverter
Generally, the general-purpose inverter roughly includes the following parts: (1) rectifier circuit; (2) DC central circuit; (3) Inverter circuit; (4) Control circuit. The static test is mainly a test of the high-power transistors (power modules) of the rectifier circuit, DC center circuit and inverter circuit. Whole...
|
|
LS power generation installs the switching power supply step
The basic method of switching the power supply of the device requires us to carry out the corresponding installation and debugging according to the specific model and the device environment. And in the process of installation, we need to pay more attention to safety and stability to ensure the normal operation of the switching power supply.
...
|
|
The function and function of the inverter VFD - LS produces electricity
1. Energy saving
The energy-saving effect of VFD is mainly manifested in the application of fans and water pumps. After the fan and pump load is selected for frequency conversion speed regulation, the power saving rate is 20% - 60%, because the actual power consumption of the fan and pump load is basically proportional to the cubic speed. When users ask for an average ...
|
|
LS GTH, GTK series thermal relay models
Thermal Overload Relay GTH-22
GTH series: GTH-22, GTH-40, GTH-85, GTH-100, GTH-150, GTH-220,
GTH-400、GTH-600、GTH-12M、GTH-12MH、GTH-12M、GTH-MH
GTH series: GTH-22, GTH-40, GTH-85 ...
|
|
What are the determinants of the performance of LS inverters?
The quality of the control circuit determines the function of the LS inverter.
The function of the DC central circuit is to smooth the output of the rectifier circuit to ensure that the inverter circuit and the control power supply can obtain a high-quality DC power supply. When the whole ...
|
|
The protection measures of the power generator inverter for the motor
The protection of the motor by the power converter mainly includes the following aspects: overvoltage protection, undervoltage protection, overcurrent protection, phase loss protection, inverter protection, overload protection, grounding protection, short circuit protection, overfrequency protection and stall protection.
...
|
|
LS Group witnesses the reopening of the "Viet Nam Professional Football League".
The Viet Nam Professional Football League, sponsored by LS Group, began operations in June and is hosted by Viet Nam Professional Football Joint Stock Company. With the comeback of football events such as the Korea K League and the Bundesliga, more and more football events are also brewing to restart.
...
|
|
Contact
working hours
