An Chuan frequency converter is called "An Chuan AC variable frequency governor", which is mainly used to control and adjust the motor speed of three-phase asynchronous AC motor.
When the working current frequency of the motor is lower than 50Hz, it will save electricity, so the inverter is one of the energy-saving products called by the state.
With the popularization of energy saving and industrial automation, frequency converters are used more and more, with tens of billions of sales in China every year.
An Chuan frequency converter is one of the world famous frequency converters, which is produced by Yaskawa Electric Company and has a high share in the world.
At present, Yaskawa Electric has a factory in Shanghai, China, specializing in the production of series of inverters such as CIMR-G/CIMR-F/CIMR-E/CIMR-L.
An Chuan inverter has been in China for more than 20 years, and now the following series are mainly used in the market:
Low voltage models are:
V 1000: amazing performance! Control of small frequency converter with simple real current vector
J 1000: Feel the high reliability from the small and exquisite frequency converter! Simple operation and setting.
Varispeed G7: High performance &; Multipurpose! Real vector control universal frequency converter
Variable speed F7: energy saving &; Efficient! Current vector control universal frequency converter
Variable speed E7: a special frequency converter for Feng HVAC market.
VarispeedV7: Small Vector Controlled Universal Inverter
Varispeed L7: synchronous and asynchronous motors, vector-controlled inverter for vertical elevators.
VS-656RC5: High performance &; Multipurpose!
The high-voltage models are:
FSDrive-MV 1S: high-performance environment-resistant high-voltage control frequency converter
An Chuan inverter full range manual QQ: 4342604.
Common Faults and Maintenance Countermeasures of Inverter in An Chuan
1 switching power supply is damaged, C+ {0 `* R2 \
The damage of switching power supply is the most common fault of many frequency converters, which is usually caused by short circuit of switching power supply load. Among the switching power supply circuit designs of many inverters, An Chuan inverter is quite successful. 6 16G3 adopts two-stage switching power supply, which is somewhat similar to Fuji G5. First, the first-stage switching power supply converts the DC voltage above 500 volts on the DC bus side to above 300 volts. Then lower voltages such as 5V, 12V and 24V are output through the secondary winding of the high-frequency pulse transformer, which are used as power supply for the control board, driving circuit and detection circuit of the frequency converter. In the design of the second-stage switching power supply, An Chuan inverter adopts a controllable voltage regulator named TL43 1 to adjust the duty cycle of the switching tube, so as to stabilize the output voltage. The LG inverter we talked about in previous issues also adopts a similar control method. QM5HL-24 and TL43 1 used as switch tubes are easily damaged devices. In addition, if we hear harsh screams in use, it is from the pulse transformer, and it is likely that the output side of the switching power supply is short-circuited. We can find the fault from the output. In addition, when there is no display, there is no voltage at the control terminal, and the DC 12V and 24V fans are not working, the first thing to consider is whether the switching power supply is damaged.
2 OH fault
Fault is a common fault of An Chuan inverter. IGBT module is damaged, which is one of the reasons for SC fault alarm. In addition, the damage of the drive circuit can easily lead to SC fault alarm. In the design of driving circuit in An Chuan, the upper bridge uses driving optocoupler PC923, which is a kind of optocoupler with amplification circuit specially used for driving IGBT modules, and the lower bridge driving circuit in An Chuan uses optocoupler PC929, which is an optocoupler with amplification circuit and detection circuit inside. In addition, motor jitter, three-phase current, voltage imbalance, frequency display but no voltage output may be the damage of IGBT module. There are many reasons for IGBT module damage. First of all, the damage of IGBT module is caused by the failure of external load, such as short circuit, load rotation locking and so on. Secondly, the aging of the driving circuit may also lead to the distortion of the driving waveform, or the IGBT may be damaged due to the excessive fluctuation of the driving voltage, which may lead to the SC fault alarm. 5 _，z7 ^* to e j ' I
3OH-overheating
Overheating is a common fault. When this happens, the first thing that comes to mind is whether the cooling fan is running, and if you observe the outside of the machine, you will see whether the fan is running. In addition, for machines above 30kW, there is a cooling fan inside the machine, and the damage of this fan will also lead to OH alarm.
4 UV-Undervoltage Fault
When an undervoltage fault occurs, first check whether the input power supply is out of phase. If there is nothing wrong with the input power supply, it is necessary to check whether there is anything wrong with the rectifier circuit. If there is no problem, it depends on whether there is a problem with the DC detection circuit. For 200V class machines, when the DC bus voltage is lower than 190VDC, an ultraviolet alarm will appear. For 400V machines, when the DC voltage is lower than 380VDC, a fault alarm will appear. Mainly check whether the step-down resistor is open. 4 y，]，\' j8 x$ Z8 a H
5gf—- grounding fault! Y) Q6 F4 identification number b2 is not applicable.
Grounding fault is also a common fault. In addition to eliminating the cause of motor grounding problem, Hall sensor is the most likely component to fail. Due to the influence of environmental factors such as temperature and humidity, the working point of Hall sensor is prone to drift, leading to GF alarm.
Application of frequency converter in An Chuan.
1, air conditioning load level
Office buildings, shopping malls, some supermarkets and factories all have central air conditioning, which consumes a lot of electricity during the summer peak period. In hot weather, the electricity consumption of air conditioners in Beijing, Shanghai and Shenzhen accounts for more than 40% of the peak electricity consumption. Therefore, it is a very good energy-saving technology to drive the refrigeration pump, cold water pump and fan of air conditioning system with frequency conversion device. At present, there are many companies specializing in air conditioning and electricity saving in China, and the main technology is frequency conversion and speed regulation.
2, crusher load
There are many crushers and ball mills used in metallurgical mines, building materials and other industries, and the effect of this kind of load after frequency conversion is remarkable.
3, large kiln calciner load
In the past, large industrial rotary kilns (converters) such as metallurgy, building materials and caustic soda mostly used DC, commutator motor, slip motor, cascade speed regulation or intermediate frequency unit speed regulation. In recent years, many units have adopted frequency conversion control because these speed regulation methods have slip rings or low efficiency, and the effect is excellent.
4. Compressor load
Compressors are also widely used loads. Low-pressure compressors are widely used in various industrial sectors, and high-pressure large-capacity compressors are widely used in steel (such as oxygen generators), mines, fertilizers, ethylene and other industries. Adopting frequency conversion speed regulation has the advantages of small starting current, energy saving and optimization of equipment service life.
5. Rolling mill load
In the metallurgical industry, in the past, AC-AC converters were mostly used in large rolling mills, but in recent years, AC -DC- AC converters have become a trend, especially for light-load rolling mills, such as the multi-stand aluminum rolling mill in Ningxia Minzu Aluminum Products Factory, which meets the requirements of low-frequency on-load start, synchronous operation between stands, constant tension control and simple and reliable operation.
6, lifting load
Winch load adopts frequency conversion speed regulation, which is stable and reliable. Blast furnace hoisting equipment in ironmaking plant is the main conveying equipment of ironmaking raw materials. It is required that the starting brake should be stable, the acceleration and deceleration should be uniform and the reliability should be high. In the past, cascade, DC or rotor series resistance speed regulation was used, which was inefficient and unreliable. The ideal effect can be achieved by replacing the above speed regulation mode with AC inverter.
7. Converter load
For inverter load, it is simple and reliable to replace DC unit with AC frequency conversion, and the operation is stable.
8. Roller load
In iron and steel metallurgy industry, the roller load is mostly controlled by AC motor frequency conversion, which can improve the reliability and stability of equipment.
9. Pump load
The load of pumps is large and wide, including water pumps, oil pumps, chemical pumps, mud pumps and sand pumps. , including low-pressure small and medium-capacity pumps and high-pressure large-capacity pumps.
Many pumps in water supply companies, chemical pumps in chemical fertilizer industry, reciprocating pumps, mud pumps in non-ferrous metals and other industries all adopt frequency conversion speed regulation, which has produced very good results.
10, crane, dump truck loading
Load torque of cranes, dump trucks, etc. Is big, requires stability, frequent positive and negative and reliable. Using frequency conversion device to control cranes and dump trucks can meet these requirements.
1 1, wire drawing machine load
The wire drawing machine for producing steel wire requires high-speed continuous production. The steel wire strength is 200Kg/mm, and the speed control system requires high precision, high stability and synchronization.
12, transport vehicle load
It is very effective to use frequency conversion technology in coal mine raw coal loading or steel plant molten steel transporter. Quick start and stop, strong overload capacity, flexible forward and reverse rotation, smooth coal surface, correct weight (less loading or less loading), basically no manual operation, improving raw coal production efficiency and saving electricity.
13, lift overhead tour bus load
Because the elevator is a manned tool, it requires high reliability of the traction system and frequent acceleration, deceleration and forward and reverse rotation. With the improvement of elevator dynamic characteristics and reliability, the safety, comfort and efficiency of elevator operation have been improved. In the past, most elevators used DC speed regulation, but in recent years, it has gradually changed to AC motor frequency conversion speed regulation, regardless of Japan and Germany. Many elevator factories in China are scrambling to equip elevators with variable frequency speed regulation. Such as Shanghai Mitsubishi, Guangzhou Hitachi, Qingdao Fuji, Tianjin Otis, etc. All adopt AC frequency conversion speed regulation. Many elevators originally produced have also undergone frequency conversion transformation.
14, feeder load
There are many feeders in metallurgical, electric power, coal, chemical and other industries, and the effect of variable frequency speed regulation is very obvious whether it is a disc feeder or a vibrating feeder. The disc feeder of sulfuric acid production line in dye factory of Jihua Company used to be slip speed regulation, with low frequency torque, many faults and frequent jamming. After adopting frequency conversion speed regulation, because it is an asynchronous motor, it has high reliability and saves electricity. More importantly, it is closed-loop with the temperature transmitter to ensure the accuracy of conveying materials, so as to avoid accidents caused by excessive and over-temperature delivery of oxidants and ensure the production order.
15, stacker-reclaimer load
The stacker-reclaimer is the main equipment for stacking materials in coal yards, docks and mines, and its main function is to stack materials. Automatic palletizing and semi-automatic material taking are realized, which improves the reliability of the equipment, and the equipment runs smoothly without impact and shaking. The feeding process is rotated and adjusted according to the law of 1/cosφ, which improves the bucket rotation efficiency and the uniformity of belt coal transportation, and is very popular with workers.
16, fan load
Fan load is a large-scale and wide-ranging equipment, which is widely used in steel mills, power plants, nonferrous metals, mines, chemicals, textiles, chemical fibers, cement, paper making and other industries. Most of them adjust the air volume by adjusting the opening of the baffle, which wastes a lot of electricity. Adopting frequency conversion speed regulation can save electric energy, reduce mechanical wear and prolong the service life of equipment.
17, mixer load
There are many mixers in chemical and pharmaceutical industries, so it is very beneficial to replace other speed regulation methods with frequency conversion speed regulation.
18, spinning machine load
The spinning process is very complicated, there are many stations, which need tension control, and some also need position control. Frequency conversion speed regulation effect is good.