It should be said that LENZE inverter will still encounter some such and such faults in use, the above is also a rough introduction to some common faults and analysis, LENZE inverter is still very characteristic in performance, such as position control, synchronous control are its advantages, so it is worth studying in the application. In addition, from the perspective of maintenance, the LENZE inverter circuit is relatively complex, and the PCB board has multi-layer wiring, which has higher requirements for maintenance personnel.
1 Introduction
LENZE inverter, in the field of drive products is also a very famous brand, originated from Germany, the main products include inverter, servo controller, DC controller, AC and DC motor, servo motor, magnetic powder clutch, and gear reducer, etc., it should be said that LENZE has its own solutions in the field of drive products. In China, LENZE inverters are widely used in textile, papermaking, tobacco, printing, packaging, metallurgy, food, automobile manufacturing and material transportation and other industries. It should be said that LEMZE inverter still has a considerable reputation in the inverter market, and it is more and more recognized and accepted by the majority of domestic users.
LENZE drives are more powerful, with a wide range of application options, a wide range of functions that can be extended, and good torque characteristics (up to 180% of 60s torque provided), which are unmatched by other frequency converters. In addition, LENZE inverters also provide a number of inverter series for different occasions to meet the needs of different users. Servo drive plus servo motor is another solution provided by LENZE for higher application requirements, which makes LENZE have a wider customer distribution and more application industries.
LENZE inverter has not been in the Chinese market for too long, and has also experienced a process of being accepted by the majority of customers from unfamiliarity - cognition - acceptance. In the early days, we could see LENZE inverters were mainly some low-power 8100 series, 8300 series inverters, and high-power 8600 series. In addition, we can see the LENZE 7800 series inverters using Fujifilm G5 series inverter technology. These machines entered the Chinese market relatively early, mainly with the equipment to enter the Chinese market. Due to the longer service life, there is a higher chance of failure. However, these series of inverters are relatively few in the market, and some models of inverters are not common, and now we mainly include 8220/8240 series general-purpose inverters, 8200EV series vector closed-loop inverters, and 9300 series engineering vector inverters. In addition, LENZE has launched distributed mechatronic frequency converters. 8220/8240 series inverter has been on the market for a long time, relative to the same period of inverter function is also relatively powerful, and there are a variety of options to choose from, powerful communication function is its big advantage, the series of inverter can have a variety of bus communication methods to choose from, in addition to the common RS-232/RS-485 communication, including INTERBUS, PROFIBUS, CANBUS and other communication methods. In addition to a variety of bus communication options, the 8200EV series inverter has a built-in RFI filter and a starting torque of 180% for 60s. The 9300 series drives are a more powerful vector drive, in addition to the series of functions we mentioned earlier, they also include dual PID functions and can also be used as an optional component for speed/torque switching control, step control and position control. It should be said that LENZE is a very powerful inverter brand, and because it has its own gear reducer, motor and other supporting facilities, LENZE's users are also growing.
2 Common faults and treatment methods of LENZE inverter
The following we will discuss some common faults of LENZE inverter for the majority of users to use and repair as a reference:
(1) The pulse transformer is damaged
For the early ones such as the 8100 series and 8300 series inverters, our more common faults are the damage of the switching power supply, most of which are the damage of the pulse transformer, which reflects the phenomenon that the machine has no response after powering on, and the control terminal has no voltage. Because the skeleton of the pulse transformer is not easy to disassemble, it has caused certain difficulties to the repair of the transformer, and the parameters of the pulse transformer used by various inverter brands are not the same, which has also brought some difficulties to our winding. Since there is a relatively small market for such machines, we will not discuss them in detail.
(2) OC5 failure
OC5 fault should be a fault phenomenon that we often encounter in the 8220/8240 series inverter. OC5 is the overload of the inverter, and the overload detection is generally completed by the Hall sensor, which detects the current of the two phases of UV, and then judges whether the inverter is overloaded by the two inputs or the gate COMOS circuit. The fault point of OC5 is usually caused by the damage of the sensor and the damage of the gate circuit, the Hall sensor is easily affected by the environment, and the drift of the working point occurs, and the gate circuit is often damaged due to the impact of the working voltage and input signal. Replacing a damaged device should be able to troubleshoot such faults.
(3) Output phase loss
The lack of phase of the output is also one of the failures that we often encounter. We all know that it is impossible to drag the three-phase AC asynchronous motor in the state of phase loss, and there will be an overcurrent alarm in the case of dragging the motor, and the 3-phase output voltage is measured after disconnecting the motor, and the 3-phase output voltage is often relatively different, at this time, the first thing to check is whether the power module is damaged and whether the driving waveform is normal. In the LENZE 8240 series inverters, it is common to encounter the phenomenon that there is no voltage in the drive circuit. The difference between the 8240 series inverter and other inverters is that the driving power supply is not directly supplied by the switching power supply, and there is isolation between the driving circuit and the switching power supply. So we also have to check if there is a problem with the isolation transformer. Troubleshooting the above should determine whether the power supply to the drive circuit is normal.
(4) Switching power supply failure
In the repair of the 8200 series general purpose inverter, we will often encounter the damage of the switching power supply. The main points of failure are the damage of the power switch and the damage of the switching power supply control circuit. The damage of the switch tube is easy to replace, the original type of transistor and its replacement transistor can be bought, the repair of the control circuit after the failure is relatively complicated, the control circuit components of this type of machine are integrated on the insulating ceramic sheet, it is not easy to replace, and it requires certain experience and maintenance skills.
(5) Failure caused by heat dissipation of the inverter
The heat sink separation heat dissipation technology is also a big selling point of LENNZE inverters, we all know that conventional inverters have cooling fans to dissipate heat, but in some occasions the use of cooling fans often becomes a common failure point of the inverter. This phenomenon is mainly common in textile factories. Cotton wool and chemical fibers in the air in textile factories often clog fans, causing inverter failure alarms. The heat sink separation and heat dissipation technology of LENZE inverter solves this problem. However, we will also encounter customers who can not afford to carry heavy load after a period of use, and from our experience analysis, it may also be caused by the heat dissipation problem of the inverter, due to insufficient heat dissipation, the components are more likely to age, and the loss is faster. In this case, replacing the aging device can solve the problem.
In addition, in practical applications, we can also judge the status and failure of the inverter according to the state of the inverter's light-emitting diode, especially in the absence of a panel. Generally, when the green light is on and the red light is off, it is in the operating state of the control panel. If the green light flashes and the red light is on, the control panel is disabled. The green light is off, and the red light flashes once a second, and the inverter is in a fault state.
3 Concluding remarks
It should be said that LENZE inverter will still encounter some such and such faults in use, the above is also a rough introduction to some common faults and analysis, LENZE inverter is still very characteristic in performance, such as position control, synchronous control are its advantages, so it is worth studying in the application. In addition, from the perspective of maintenance, the LENZE inverter circuit is relatively complex, and the PCB board has multi-layer wiring, which has higher requirements for maintenance personnel.
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