Siemens inverter common faults and maintenance skills

Siemens, in the field of automation should be a prestigious brand, PLC, man-machine interface, inverter, servo products, automation instruments, etc., almost all areas of automation control, in all industries have also won a good reputation.

Siemens inverter occupies an important position in the inverter market with its stable performance, rich combination of functions and good torque characteristics. And with its strong brand effect, it broke the monopoly position of Japanese brand inverters in the Chinese market. According to statistics from professional market research institutions, Siemens' high- and low-voltage inverters have ranked first in the Chinese market.

The earliest use of Siemens inverters in the Chinese market was in the steel industry. However, at that time, motor speed control was mainly based on DC speed regulation, and the application of inverters was still an emerging market. With the continuous development of electronic components and the continuous maturation of control theory, frequency conversion speed control has gradually replaced DC speed control, becoming the mainstream of the drive products. Siemens frequency converters have achieved great value in this huge Chinese market due to their strong brand effect. With the development of over-scale, the successful development of Siemens in China's inverter market should be said to be the perfect combination of Siemens brand and technology. The early Siemens inverters we encountered in the Chinese market were mainly SIMOVERT A for current sources and SIMOVERT P for voltage sources. These inverters have also entered the Chinese market due to the introduction of equipment. There are still a few The use of the product, followed by a large number of sales in the Chinese market, mainly MICRO MASTER and MIDI MASTER, as well as a series of SIMENS inverters most successful SIMOVERT MASTERDRIVE, which is what we often say 6SE70 series. It not only provides AC-AC frequency converters for general-purpose applications, but also provides DC bus solutions for multi-motor drives that are required in paper, chemical fiber and other special industries. Of course, Siemens also introduced ECO inverters which, in my opinion, technically fail comparatively but are quite successful in the market. The technical failures are mainly due to its high failure rate. The success of the market is mainly due to its Beyond the Fujitsu inverter to become the first brand in the Chinese market. Now Siemens' main model in the Chinese market is the MM420, MM440.6SE70 series.

Frequent Failures of MICRO MASTER and MIDI MASTER Series Inverters Due to the large sales volume of Siemens inverters in the Chinese market, many problems will inevitably be encountered in use. Here are some common faults of Siemens inverters and users here: Do a discussion:

The Siemens frequency converter should be an earlier brand entering the Chinese market, so some old products such as the MICROmaster and MIDI MASTER still have a large number of users in use. Let us first analyze the common faults of these two series of products.

For MICRO MASTER series inverter, our most common fault is the power no display, the switching power supply of this series of inverter uses a UC2842 chip as the waveform generator, the damage of this chip will cause the switching power supply to work, so it can not display normally. In addition, the abnormal operating power of the chip also makes the switching power supply unable to work normally.

For the MIDI MASTER series inverter, our common failures are mainly the damage of the drive circuit and the damage of the IGBT module. The MIDI MASTER drive circuit is driven by a pair of tubes to drive the IGBT module, and this pair of tubes is also the most easily damaged element. Device, the cause of the damage is often due to the damage of the IGBT module, resulting in high voltage and large currents into the drive circuit, resulting in damage to the components of the drive circuit.

6SE70 series inverter common fault For 6SE70 series inverter, due to good quality, the failure rate is obviously reduced, we often encounter the fault phenomenon F008 (DC voltage is low), because it is directly through the resistance buck to obtain the sampling signal, so The occurrence of fault F008 is mainly due to the damage of the sampling resistor. In addition, we will also encounter F025, F026, F027, on the lack of input phase alarm, the cause of the failure is because the 6SE70 series itself with the input phase detection function, input detection circuit damage will lead to the input phase loss alarm, such as troubleshooting For the reason, the alarm signal cannot be eliminated. It is very likely that the fault is the damage of the CU board. In addition F011 (overcurrent) fault is also a common fault, the damage of the current sensor is one of the causes of this fault, in addition we often encounter in the maintenance of the drive circuit and switching power supply some of the filter capacitor damage Can also cause F011 alarm. Pay special attention to the fault alarm caused by this reason.

Common Faults of ECO Series Inverters For ECO inverters, the most common ones we encounter are the burnout of power boards and the damage of power modules. The main causes are the strong power side (power module) and weak current side (drive circuit). There is no isolation circuit, resulting in strong power into the control circuit, causing a large area burnout of the drive circuit and switching power supply, in addition to the pre-charge circuit damage is also a common fault (30kW or more), because the current limiting circuit design on the AC input side, as long as there is three-phase AC When the power supply is powered on any route, there are timing advances and lags, which may cause oneself.