SIEMENS Inverter common fault analysis
This will be based on their common SIEMENS Inverter fault analysis and processing.
1, Introduction 20 century, the late 50s, the field of electric drive of a major technological change? The original constant speed drive for the exchange of only Electric motor Achieve speed control, to replace the manufacture of complex, expensive, inconvenient to maintain the DC motor. Over the past decade, with the power electronics technology, microelectronic technology and modern control theory to the field of electric drive penetration, frequency converter has been widely used in AC motor speed control. The main feature is a highly efficient drive performance and good control characteristics. In Fans , Pumps, Compressor Applications such as fluid machine can save a lot of power; in Textile , Fiber , Plastic, chemical and other industries, use of automatic control of converter performance can improve product quality and quantity; in Machinery industry , The application of inverter is the transformation of traditional industries, Electrical An important means of integration; in the factory Automation Technology, the AC servo system is being replaced by DC servo system. Servo systems from hundreds of watts to tens of thousands of kilowatts of large power high-speed transmission, from the general requirements of small-scale speed transmission to high-precision, fast response, wide range of speed drive, drive to multiple machines from a single coordinated operation AC speed control unit can be used. Little can be said that wherever the motor inverter use.
2, Siemens General Characteristics of the Frequency
Siemens inverter to enter the Chinese market late, but its fastest growing. Siemens frequency converter consists of general-purpose, project-based and special-type three. Siemens Universal Converter fast growth because of the following areas:
(1) to introduce new products to meet the specific requirements of different users. Siemens product update cycle in general no more than 5 years. Their products to meet the special requirements of different users.
(2) powerful communication features and a comprehensive package of software, Siemens automation products is a major feature. This is in paper, chemicals, Steel , Machinery and many other industrial automation control from the transformation to comprehensively promote the rapid development process, exudes a sense of its Competition Advantage.
(3) the last two years a new generation of launch MM4 inverter type converter only works with Siemens MasterDrive good architecture, but also has high performance and low cost, while the price is not high but there is more than similar products powerful. Using BiCo function more complex functions can be programmed, it can be input (digital, analog, serial communications, etc.) and outputs (inverter current, frequency, analog output, relay output nodes, etc. ) between Boolean algebra and mathematical relationships.
(4) MM4 new generation inverter to another inverter is different from the other notable characteristics: he provided to the user programming is a completely open platform that allows users to maximize their own needs and reasonable possible use of limited resources to achieve complex control features. It features dozens of free blocks can replace the PLC to achieve some simple programming operation.
(5) As the price low, inverter used in the manufacture of some of the time forced the bottom of the original device, or devices in the selection of the original amount is too small to consider the rich. For example: pressure, temperature resistance, voltage, current shock. Therefore, in our practice to use relatively more problems, something that makes us feel very regrettable.
3, Fault Analysis and Treatment Methods
General, when you get a faulty inverter, and then use the power before the first Multimeter Check rectifier bridge and IGBT modules have burned, the circuit board with no obvious signs of burning.
Specific method is: use the multimeter (preferably using analog form) the resistance of 1K files, and black bars connected inverter DC side (-) pole, stick with a red table were measured three-phase inverter three-phase input and output resistance, the resistance should be between 5K-10K, three-phase resistance to the same output resistance slightly smaller than the input, and does not charge and discharge phenomena. Then, in turn, take the red table stick inverter DC side (+) pole, and black bars were used to measure three-phase input and three-phase inverter output resistance, the resistance should be between 5K-10K, three-phase resistance to the same output resistance slightly smaller than the input, and do not charge and discharge phenomena. Otherwise, the description module damage. Power can not be blind this time, especially the bridge rectifier circuit board damage or obvious signs of burning, particularly where power prohibited to avoid greater losses.
If the above measurements show that the basic modules no problem, could be on observation.
(1) After power Panel Show [F231] or [F002] (MM3 converter), this failure generally have two possibilities. Common because of the power driver board problem, a small part caused because the control board, you can try first for a control board, otherwise, the problem certainly part of the power driver board.
(2) No power on the rear panel display (MM4 inverter), under the light panel [green is not bright, yellow light flash], This phenomenon indicates that the work of rectification and switching power supply is normal, the problem out a certain way in the switching power supply is not normal (rectifier diode breakdown or open, you can use multimeter to measure switching power supply rectifier diodes in several way, it is easy to find problems. for a corresponding rectifier diode problem solved. This problem is generally low voltage diodes, power pulse shocks.
(3) sometimes show [F0022, F0001, A0501] variable (MM4), tap or move a bit panels and chassis Motherboard Sometimes to normal, the general problem is connectors, check the site connector. Also found that individual machines because the circuit board of the RC component quality issues or Welding Bad result.
(4) is displayed after power [—–]( MM4), generally control board problem. In most cases, for a control board problem solved, generally because of the external control circuit has a strong electric control board due to interference of some elements (such as quote-chip capacitors, resistors, etc.) damage actions, and my analysis and the control board cooling well there is a certain relationship. But some problem in the power supply board.
Example: in Chongqing Cement Plant used a rotary drive MM440-200kW inverter, because a larger load inertia, starting torque, large equipment, the frequency can only boot up to 5Hz or so is not anymore
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