|Input voltage: 1 (V) || Waveform distortion: 1 (%) || Frequency regulation of: 1 (%) |
| Output voltage: 1 (V) || Load regulation: 1 (%) || Circuit mode: SPWM switching |
| Load Type: Rectifier load || Custom processing: || Efficiency: 1 (%) |
| Applications: Motor || Type: AC Power Supply || Model: AF400 |
| Output frequency: 1 (Hz) || Brand: ACS || Product Certification: CCC |
| Control mode: Pulse width modulation type || Input Frequency: 1 (Hz) |
Because of historical reasons, the world grid index is not uniform, which for our export products worth, creating a barrier. I research and development company with production and export of military technology to accurately simulate grid conditions in different countries. IF frequency power supply is a static device, the Three-phase frequency power conversion into a single-phase power. adaptable to a variety of loads, wide application, mainly used in all kinds of metal smelting, insulation, sintering, welding, hardening, tempering, diathermy, liquid metal purification, heat treatment, bending, and crystal growth, etc.
Advanced repeated start function, to achieve 100% success start startup mode using it switched laser excitation in the form of zero-voltage soft start frequency sweep mode, the entire startup process, frequency adjustment system and the current, the voltage regulator off bad system, time tracking load changes, to achieve the desired soft start, this start-up mode for small SCR impact, which will help prolong the life of the SCR, but also has the advantages of light and heavy loads are easy to start, especially full furnace steelmaking furnaces, frozen oven You can easily start.
Cutting-edge technology, exceptional energy savings control circuit uses a microcomputer constant power processing circuitry, the installation of automatic adjustment circuit inverter Ф angle, at any time during operation will automatically monitor voltage, current, frequency of changes, and thus Analyzing the changes in load, it will automatically adjust to match the load impedance, to achieve constant power output, which reached the section, saving the purpose of improving the power factor.
IF power works as follows: full-controlled three-phase bridge rectifier circuit AC to DC rectifier; after smoothing reactor; become a constant DC current source; then by single-phase inverter bridge; the DC current of the inverter to a certain frequency (typically 1000 to 8000Hz) of the single-phase IF current. The load is composed of an induction coil and a compensation capacitor, connected in parallel resonant circuit.
Under normal circumstances, you can follow the frequency power failure does not work Symptom divided into two categories can not start and start completely. As a general rule, when after a failure, should in case of power failure to the entire system for a comprehensive Check, which includes the following aspects:
(A) Power: measured with a multimeter to see if the back of the main circuit switch (contactor) and control of an electric fuse, which would exclude the possibility of disconnection of these elements.
(B) Rectifiers: three-phase full-controlled rectifier bridge rectifier circuit, which includes six fast fuses, six thyristors and six pulse transformers and a freewheeling diode in the fast fuse with a red indicator. normal indicator shrink inside the shell, when the fuse blows it will pop up soon, some fast-acting indicator is tight, when the fuse blows soon, it will be stuck on the inside, so for the sake of reliability, can be measured with a multimeter pass out of stock about fast-acting, to determine if it is blown.
Simple method of measuring the thyristor is blocked with a multimeter electricity (200Ω block) measuring about its cathode - anode, the gate - cathode resistance when measured thyristor not taken down under normal circumstances, the anode - between the cathode resistance should be infinite, the gate - cathode resistor should be between 10-50Ω, too large or too small are that only thyristor gate fails, it will not be triggered conduction.
Pulse transformer secondary side connected to the thyristor, connected to the main control board primary side, measure the primary resistance of about 50Ω with a multimeter. Freewheeling diode is generally not prone to failure, check with a multimeter block measuring diode second end, forward When the multimeter displays junction drop of about 500mV, reverse nowhere.
(C) Inverter: inverter includes four fast thyristors and four pulse transformer can be checked by the method described above.
(Iv) Transformers: each winding of each transformer should be through, usually about tens of ohms primary resistance, sub-polar few ohms should be noted: primary and intermediate frequency voltage transformer load in parallel, so its the resistance value is zero.
(E) capacitors: parallel with the load electric capacitor may be breakdown, the capacitor is generally installed in the capacitor packet frame check should first determine where the group is disconnected capacitor breakdown for each group of the capacitor bus busbar and main bus. the connection point between the rows, two bus capacitors measuring the resistance between each group, normal should be infinity. confirmation bad group, and then disconnect each electric bus capacitors lead to a soft copper, one by one check you can find the breakdown of capacitors electric capacitors each composed of four cores, the shell is a pole, another pole through four insulators were introduced onto the cover, usually only have a core breakdown, jump This leads on to open insulator, this capacitor can continue to use, its capacity is 3/4 of the original. Another failure of the capacitor is oil spills, generally does not affect use, but pay attention to fire prevention.
The angle mount capacitor and capacitor frame is insulated, if insulation breakdown will cause the main circuit to ground, measure the resistance capacitor case between lead and the capacitor frame, you can determine the insulation condition of this section.
(Vi) water-cooled cables: the role of water-cooled cables connecting frequency power supply and induction coil, which is twisted together with each of the copper wire diameter Φ0.6-Ф0.8 500 kilograms for electric, cable cross-sectional area of 480 mm2. For 250 kilograms stove, cable cross-sectional area with 300-400 mm2. Water-cooled cable outer hose pressure-resistant 5 kg of pressure rubber tube, through which cooling water, which is part of the load circuit by tension and torsion at work, together with the furnace tilting and tortuous occur, it is easy to break off connections in flexible water-cooled cable fracture process after a long time, usually after the first cut off the majority, in power run time is not broken soon blown small part, Then it will produce a high frequency power supply over-voltage, over-voltage protection if not reliable, it will burn the thyristors after the water-cooled cables disconnected, frequency power supply can not start work. If you do not check out the reason and start again, it is likely IF voltage transformer burned when checking the available fault oscilloscope, the oscilloscope probes across the load clip, observe whether the decay waveform press the start button. OK core cable break when first water-cooled cables and copper output electric capacitor disengaged the resistance measuring cable, the normal value of zero resistance with a multimeter power block (200Ω block), disconnect the infinite. When measured with a multimeter, it should turn the furnace pouring position, to make water-cooled cables away from, so make off completely out of place, in order to properly determine whether the broken core.