Kewo products cover variable frequency inverter, servo drive system, solar pump inverter, automation equipment and so on. Its products are widely used in many fields such as petroleum, chemical, ceramics, lifting, machine tools, metal products, wire and cable, plastic, printing and packaging, textile and chemical fiber, metallurgy, coal, municipal and more.,
Features : 3 times peak power, excellent loading capability. Combine inverter/solar controller/battery all in one. Multiple output : 2*AC output socket, 4*DC 12V, 2* Working mode AC prior/ECO mode/Solar prior selectable AC charging current 0 1 0A selectable. LVD/HVD/Charging voltage adjutable, suitable for kinds of battery Adding fault code to monitor real time work situations Continuous stable p ure sine wave output with inbuilt AVR stabilizer . Digital LCD and LED for visualization of operation status of the equipment. Inbuilt automatic AC charger and AC mains switcher, stwitch time 4ms
Flexible Two independent MPPT trackers for solar ongrid inverters Various power classes: from 1kW to 40kW solar ongrid inverters Available for both single phase and three phase solar ongrid inverters Efficient Up to 1000 V DC input voltage range 98.5% efficiency 99.9% MTTP efficiency for solar ongrid inverters Secure Operation Internal DC switch for added safety protection of solar ongrid inverters Transformerless design and easy installation Compact design, no fan, low noise technique Power factor continuously adjustable Future-Proof Comprehensive grid management functions Ethernet-based communication, support USB, WIFI, GPRS Standard ethernet RS485 output 5 years standard warranty IP65 compatible for solar ongrid inverters Film capacitor design, 25 years of design service life
DNV360/DNV310/DNV300 series inverter is a high-quality, multi-function vector control inverter. Flux through the motor current and torque current decoupling control, to achieve a rapid response and accurate torque control, high precision operation for a wide range of speed and torque control. The new hardware platform, scientific production technology and self-developed special debugging testing equipment to ensure the product more stable and reliable in below applications. Metallurgy, petroleum, chemical, textile, electric power, building materials, coal, medicine, food, paper, plastics, printing, lifting, cable, washing, water, heating, sewage treatment and other industries, machinery and equipment for: drawing machine, mixer, extruder, slitting, winding machinery, compressors, fan pumps, grinders, conveyors, hoists, centrifuges, and a variety of mechanical speed. Low frequency 180% large torque 3-hall hardware protected Waves current limit. Over-load, over-torque protection. Extensive expansion and interface Rich industry application of expansion card 11 digital input / 4 digital output 2-way AD/ 2-way DA Digital voltage/ pulse given/ rotary encoder Powerful communication function Drino standard Modbus Optional industrial application Modbus SAE 1939 of HEVBUS CAN Siemens Pribus DP A key shuttle double-keyboard control Local/ Remote Multi-language text display 8 group of control parameters storage Application filed: Metallurgy, petroleum, chemical, textile, electric power, building materials, coal, medicine, food, paper, plastics, printing, lifting, cable, washing, water, heating, sewage treatment and other industries. Machinery and equipment for : drawing machine, mixer, extruder, slitting, winding machine, compressors, fan pumps, grinders, conveyors, hoists, centrifuges, and a variety of mechanical speed.
Product Structure 1. Bypass Cabinet (Optional) The by-pass cabinet or switching cabinet may employ isolating breaker, vacuum contactor or the combination, depending on the user¡¯s working conditions. The function of by-pass cabinet is to put the motor into operation in industry frequency grid after the WLD-HVF exits, so as to ensure the continuity of user¡¯s production. The switching cabinet is designed to divert the WLD-HVF output to different motors. 2. Transformer Cabinet Used for installation of Phase-shift transformer, it is dry type transformer with functions of temperature display and over-heat protection, also with insulation grade of H. The secondary multi-winding output provides phase-shift power supply to the power unit. This can greatly improve the current waveform on grid side and reduce the harmonic interference of the equipment to power grid lower of the National Criterion. 3. Power Unit Cabinet Used for installation of power units, which adopted imported high quality components inside, all power units are installed on the sliding seat, it is very easy to replace. 4. Control Cabinet Used for installation of low voltage control components, there are controller, PLC, UPS, Electric siren, DC 24V power supply, Control Power Source Switch, Wiring Terminals, Touch Screen, Operation Button etc. The equipment adopted fiber optical communications, which has a very good EMI restraining performance; The transformer, control cabinet and all power units, are built in temperature protection, so it will be maintenance free. Technical Features Voltage source High-high frequency inverter, it can realize No-step speed regulation, which makes the typical motors into intelligent motors. Low harmonics input and high power factor, the typical value for power factor is 0.95 through whole speed regulation, even more higher, no need for power factor compensation. WLD-HVF output few harmonics, the motor does not generate extra heat and noise. Modularized design of power units, interchangeable and easy to produce and repair, the equipment can find any fault exactly based on advanced diagnostic procedures in MPU. The inverter still can operate even the faults for part of power units exists, if there are faults happen for inverter, the system can switch to power frequency through bypass function. Applicable to all kinds of power grid at home and abroad and suitable for typical high voltage motor. Colorful touch screen, easy to operate and maintenance. Able to realize remote control, DCS operation and communications with Host, and support all kinds of communications interfaces such as CAN, Profibus, Modbus, RS232, RS485 etc. Applied latest components, master control chip adopted TI¡¯s DSP F28335 and ALTERA¡¯s FPGA of EP3C to realize powerful processing capacity; Sampling adopted AD¡¯s AD7606 with 16 bit to ensure control accuracy of the system. The switchgear can satisfy safety requirements, and the pressure-relief channel of high voltage switch can ensure safe use of operators. Technical Parameters Series No Parameters Value 1 HVF Capacity(KVA) 250~8750kVA 2 Power of adaptive motor(KW) 200~7000KW 3 Input Frequency(Hz) 45~65Hz 4 Harmonics contents injected to power grid 0.95%(>20% of rated load) 7 Efficiency >96%(under a rated load) 8 Output frequency(Hz) 0.5~120Hz 9 Precision of output frequency 0.01Hz 10 Rated output current(A) 36~600A 11 Overload capability 120%(1min), 150%(3s), 200%(Immediate protection) 12 Control mode V/F control or Vector control 13 Analog input 0~10V/4~20mA 14 Analog output 0~10V/4~20mA Optional (2 channels) 15 Boolean input/output Communications/Default point (expandable) 16 Acc & Dec time (S) 0.1~3000s 17 Altitude
Product Structure 1. Bypass Cabinet (Optional) The by-pass cabinet or switching cabinet may employ isolating breaker, vacuum contactor or the combination, depending on the user¡¯s working conditions. The function of by-pass cabinet is to put the motor into operation in industry frequency grid after the WLD-HVF exits, so as to ensure the continuity of user¡¯s production. The switching cabinet is designed to divert the WLD-HVF output to different motors. 2. Transformer Cabinet Used for installation of Phase-shift transformer, it is dry type transformer with functions of temperature display and over-heat protection, also with insulation grade of H. The secondary multi-winding output provides phase-shift power supply to the power unit. This can greatly improve the current waveform on grid side and reduce the harmonic interference of the equipment to power grid lower of the National Criterion. 3. Power Unit Cabinet Used for installation of power units, which adopted imported high quality components inside, all power units are installed on the sliding seat, it is very easy to replace. 4. Control Cabinet Used for installation of low voltage control components, there are controller, PLC, UPS, Electric siren, DC 24V power supply, Control Power Source Switch, Wiring Terminals, Touch Screen, Operation Button etc. The equipment adopted fiber optical communications, which has a very good EMI restraining performance; The transformer, control cabinet and all power units, are built in temperature protection, so it will be maintenance free. Technical Features Voltage source High-high frequency inverter, it can realize No-step speed regulation, which makes the typical motors into intelligent motors. Low harmonics input and high power factor, the typical value for power factor is 0.95 through whole speed regulation, even more higher, no need for power factor compensation. WLD-HVF output few harmonics, the motor does not generate extra heat and noise. Modularized design of power units, interchangeable and easy to produce and repair, the equipment can find any fault exactly based on advanced diagnostic procedures in MPU. The inverter still can operate even the faults for part of power units exists, if there are faults happen for inverter, the system can switch to power frequency through bypass function. Applicable to all kinds of power grid at home and abroad and suitable for typical high voltage motor. Colorful touch screen, easy to operate and maintenance. Able to realize remote control, DCS operation and communications with Host, and support all kinds of communications interfaces such as CAN, Profibus, Modbus, RS232, RS485 etc. Applied latest components, master control chip adopted TI¡¯s DSP F28335 and ALTERA¡¯s FPGA of EP3C to realize powerful processing capacity; Sampling adopted AD¡¯s AD7606 with 16 bit to ensure control accuracy of the system. The switchgear can satisfy safety requirements, and the pressure-relief channel of high voltage switch can ensure safe use of operators. Technical Parameters Series No Parameters Value 1 HVF Capacity(KVA) 250~8750kVA 2 Power of adaptive motor(KW) 200~7000KW 3 Input Frequency(Hz) 45~65Hz 4 Harmonics contents injected to power grid 0.95%(>20% of rated load) 7 Efficiency >96%(under a rated load) 8 Output frequency(Hz) 0.5~120Hz 9 Precision of output frequency 0.01Hz 10 Rated output current(A) 36~600A 11 Overload capability 120%(1min), 150%(3s), 200%(Immediate protection) 12 Control mode V/F control or Vector control 13 Analog input 0~10V/4~20mA 14 Analog output 0~10V/4~20mA Optional (2 channels) 15 Boolean input/output Communications/Default point (expandable) 16 Acc & Dec time (S) 0.1~3000s 17 Altitude
WSD-GZTW-2 is a communication power supply designed for different capacity users. The system configuration consists of monitoring module, communication power module, AC/DC monitoring module, insulation monitoring module, battery patrol module, switch monitoring module, distribution unit, storage battery and cabinet body â? .Direct Current Panel WSD-GZTW-2 Microcomputer Controlled Communication Power Supply Screen is a communication power supply designed for different capacity users. The system configuration consists of monitoring module, communication power module, AC/DC monitoring module, insulation monitoring module, battery patrol module, switch monitoring module, distribution unit, storage battery and cabinet body. It has the characteristics of simple operation, intelligent management, high â?¡.System characteristics 1) Automatic switching of two AC inputs to ensure the normal operation of the system; 2) Wide range of input voltage and strong adaptability of power grid; 3) HZ-JK02T monitor, LCD display, Chinese menu, friendly and rich interface, simple and convenient key operation; 4) It has comprehensive system setup, operation information query and various alarm functions. 5) Intelligent battery charge and discharge management, perfect and reliable temperature compensation function; 6) The rectifier module adopts electrified hot plug-and-pull, which makes daily maintenance convenient and fast. 7) High precision dynamic current sharing, which can operate independently, principally or under control. 8) Extensible battery detection 2 groups 110 knots, insulation detection 240 routes, switch detection 160 routes, compatible with inverter power module, DC conversion module; 9) The system adopts multi-level password authority management to restrict the operation of unauthorized personnel and ensure the safe and reliable operation of the system. 10) Built-in RS232, RS485 two communication interfaces, through the background monitoring and operation monitoring system to implement the "telemetry, remote control, remote communication, remote adjustment" four remote functions, to achieve unattended; 11) Support RTU, CDT, MODBUS three communication protocols. (1) Signal devices can be added according to user's needs to realize the alarm function of accident signal and warning signal. (2) The different functions of the configuration will be different. See the function description of the module selected by the Department for details.
Principle APF is a new power electronic equipment which can dynamically filter harmonic with variable amplitude and frequency and compensate reactive power, it overcome the shortages of traditional LC filter and obtained the better compensation characteristics than passive filter. The following diagram is schematic diagram of APF, where, Vs is AC power supply, nonlinear load is harmonic source, it generates harmonic and consumes reactive power. APF is composed of instruction current operational circuit and compensation current generation circuit, the instruction current operational circuit is mainly to inspect current contents in harmonic current and reactive power of compensation object, and the compensation current generation circuit generates actual compensation current according to instruction current, the main circuit adopted PWM converter. Technical Features: Compensate any order harmonic with variable amplitude and frequency and different reactive power dynamically, and has a high-speed response time to the change of compensation object, it is hard to generate harmonic resonance with power grid impedance. It can implement compensation on single harmonic source and reactive power source and also implement centralized compensation on many harmonic and reactive power sources. Adopt full-bridge PWM converter to generate compensation current, the power unit is 5th generation IGBT, it is working under the high-frequency switching. Power circuit and control circuit adopted modularized structure or plug-in unit, same module can be replaced, which enhanced the reliability and maintenance. DSP high-speed checking and operation ensure harmonic checking and compensation control correct; It has intelligent supervisory control function, the working state and operation parameters are displayed in real-time, meanwhile, faults can be self-diagnosed; it also has remote communication interfaces, the real-time monitoring can be realized through PC. With perfect protection functions, the main circuit adopted three-phase three wire or three-phase four wire, it is designed to shunt APF, very easy and safe to operate. The master chip adopted latest floating-point DSP F28335 of TI Company and FPGA of ALTERA Company to make the system have powerful processing capacity, the sampling adopted AD7606 with 16 bits of AD Company to ensure control precision. APF can be used in power grid alone or can be combined with other passive filters together to realize hybrid filter with best ratio of performance to price. Application Fields: Static converters for industrial use, such as high and low voltage transducer (speed regulation), high capacity rectifier devices, etc. The DC equipment or transducer of the steel mill, high speed wire, boards and bars. Ferrous (non-ferrous) rolling (mill): Such as stainless steel rolling, carbon steel rolling, line rolling, aluminum sheet (strip, foil) rolling mill. Non-ferrous electrolysis industry: Electrolytic aluminum, copper, cadmium, cesium, etc. Rubber and plastic industry: Internal mixer, injection molding machine, extruding machine, blow molding machine etc Medium frequency induction heating furnace: Metal casting industry, steel mill hot rolling. Electrolysis of chemical plant: Electrolysis NaCl, electrolysis KCl, electrolysis H, et. Electroplating industry: Chroming, aluminizing and galvanizing in lighting factory, etc. Paper industry: Speed regulation used for craft, such as paper-pulp squeezer, etc Petrochemistry: During the technological process of chemical and oil refining, large amount of low voltage inverters used for speed regulation, and small amount of high voltage and high power electronic circuit equipments for starting, etc. DC traction equipment: Electrical railway, light rail vehicle, mine traction locomotive etc. Other high capacity industrial DC power supply. 2. AC/DC Arc Equipments AC/DC arc furnaces: Such as the Electric Arc Furnace in steel mill, etc. AC/DC arc welding machine: Automobile manufacturing, ship building, heavy machinery manufacturing, etc. 3. Power supply devices for special use High capacity uninterruptible power supply, communication power supply, high (low) frequency power supply, etc. Such as bank, hospital, semiconductor factory, program control exchange plant, remote communications, data communication station, substation, military installations, office buildings etc 4. Starting of the high capacity electromotor and switching of the high capacity reactive compensation. 5. High-precision automatic production line: The production line itself does not produce harmonic, but it is very sensitive to harmonic, so the active power filter should be installed at the side of power supply to reduce harmonic interference for production line. Wooden case (Fumigation).
UNI T True RMS Digital Multimeter 6000Counts Auto/ Manual Range AC/DC Tester UNI T True RMS Digital Multimeter UT15B /UT17B PRO 6000Counts Auto/ Manual Range AC/DC 1000V/10A Resistance Frequency Diode Frequency Diode Temperature VFC Tester Backlight Data hold Flashlight UT15B PRO / UT17B PRO is a high-reliability true RMS digital multimeter.The product has a built-in VFC anti-jamming start mode, which can filter out the carrier frequency interference or distortion voltage signal superimposed by the sine wave, and stably measure the output voltage of the inverter. And equipped with a hand-automatic backlight induction self-starting function. UT17B PRO has added frequency and duty cycle modes, which can switch frequency and duty measurement arbitrarily between DC / AC. It is also equipped with a temperature measurement function with a resolution of 0.1 The full range of functions of this series of products realizes the misdetection protection of up to 30KVA energy, ensuring users are safer and more reliable in operation,and obtained CETLus certification according to the CAT III 1000V / CAT IV 600V safety level. Features 1.6000 display digits / true effective value measurement range is wider 2. Large screen LCD display, easy to read data; 3.1000V AC / DC voltage measurement 4. VFC frequency conversion voltage measurement 600V (low pass) strong anti-interference; 5.LED flashlight, automatic induction backlight, to deal with dark environment 6.60M resistance measurement / 6000uF capacitance measurement 7.100kHz frequency / duty cycle (UT17B PRO only) 8. Temperature measurement (UT17B PRO only) 9. Diode / on / off beep 10. Manual / automatic range 11. Max / Min / Relative 12. Current gear protection: equipped with fused fuse 440mA / 11A 1000V fuse 13. Dangerous voltage warning function, easier to use 14. CAT III1000V / CAT IV600V safety level double insulation design.
AN87500(F) multi-channel power analyzer is specially designed for multi-channel AC/DC power measurement, suitable for power measurement of most electrical appliances, power supplies, motors, inverters and other products. The product takes the high-speed DSP processor as the core, adopts 16-bit high-speed high-performance AD direct sampling method for data acquisition, and can realize multi-channel simultaneous measurement, covering: voltage, current, power, peak voltage, peak current, power factor, crest factor, frequency, electric energy, current integral, efficiency, harmonic content and 3-phase electrical parameters, with serial communication (RS232/RS485, GPIB), remote control, alarm parameter preset and so on, supporting 1P2W/1P3W/3P3W/3V3A/3P4W and other wiring methods, meeting testing requirements of various power supply. Features: Multi-channel: 1~6 channels, flexible configuration of 1~6 single-phase, three-phase three-wire Ã?? 2, three-phase four-wire Ã?? 2, four-phase (DC+ three-phase three-wire) and other modes, satisfy test requirements of varies load (air conditioner, converter, inverter, motor); High accuracy: high-speed DSP processor, 16-bit high-speed high-accuracy AD converter, accuracy up to 0.1%, 100ms display cycle; Wide power range: current up to 50A for a single channel (optional 20A, 10A, 5A, 2A, 1A etc. or combination), minimum 0.lmW power resolution, satisfy test requirements of standby power consumption and rated power; Broadband: AC/DC signals, power measurement bandwidth: DC, 0.5Hz~100kHz, satisfy power test requirements of varies standard and non-standard sine wave load; Multi harmonic analysis: simultaneous 6-channel harmonic analysis, maximum 50th harmonic measurement, distortion analysis, visual display of total harmonic contents and total contents; Multi frequency measurement: simultaneous 6-channel frequency measurement; Line filtering: 500Hz/5.5kHz low-pass filter to measure the fundamental PWM waveform, filter out the high-frequency interference of the switching power supply current; Sensor: variable ratio, common I-I/V-V voltage/current transformers; I-V type current sensor with BNC interface, maximum input voltage 10V, optional high current sensor; Efficiency calculation: measure the input/output energy consumption of the equipment at the same time, and calculate its efficiency; Accumulation of electric energy: positive electric energy, reverse electric energy and integrated electric energy can be separately accumulated to measure the trading electric energy; Threshold alarm: independent 10 groups of voltage, current, power, power factor and other thresholds and measurement threshold for each channel, automatic upper/lower limit judgment and alarm; Chinese/English interface: Chinese or English operation and time/date display.
