Siemens Inverter is a well-known inverter brand developed, produced and sold by Siemens of Germany. It is mainly used to control and regulate the speed of three-phase AC asynchronous motors. And with its stable performance, rich combination of functions, high-performance vector control technology, low-speed high-torque output, good dynamic characteristics, superior overload capability, innovative BiCo (internal function interconnection) function and unparalleled Flexibility plays an important role in the inverter market.
The use of Siemens inverters in the Chinese market was first in the steel industry. However, at the time, the motor speed was still dominated by DC speed control. The application of inverters was still a new market, but with the continuous development of electronic components and control theory The continuous maturation, frequency conversion speed control has gradually replaced the DC speed control, become the mainstream of the drive products, Siemens inverter due to its strong brand effect in this huge Chinese market has achieved super-scale development, Siemens in the Chinese inverter market The successful development should be said to be the perfect combination of Siemens brand and technology. In the Chinese market, we can meet the early Siemens inverter mainly SIMOVERTA current source, and SIMOVERTP voltage source, these inverters are mainly due to the introduction of equipment and have entered the Chinese market, there is still a small amount of use , And then in the Chinese market a large number of sales mainly MICROMASTER and MIDIMASTER, as well as the most successful series of SIMENS inverter SIMOVERTMASTERDRIVE, which is what we often say 6SE70 series. It not only provides AC frequency converters for general use, 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.
There are many setting parameters of the inverter, and each parameter has a certain range of choices. The phenomenon of improper operation of the inverter due to improper setting of individual parameters is often encountered during use.
Control mode: speed control, torque control, PID control or other methods. After the control method is adopted, it is generally required to perform static or dynamic identification according to the control accuracy.
Minimum operating frequency: The minimum operating speed of the motor. When the motor is running at low speed, its heat dissipation performance is very poor. If the motor is running at low speed for a long time, the motor will be burned. At low speeds, the current in the cable can also increase, which can also cause the cable to heat up.
The maximum operating frequency: the maximum frequency of the general inverter to 60Hz, and some even to 400Hz, the high frequency will make the motor run at high speed. For ordinary motors, the bearing can not run for a long time over the rated speed, the rotor of the motor is Can withstand such centrifugal force.
Carrier frequency: The higher the carrier frequency is, the higher the higher harmonic components are. This is closely related to the length of the cable, the heating of the motor, and the heating of the cable heating inverter.
Motor parameters: Inverter sets the motor power, current, voltage, rotation speed, and maximum frequency in the parameters. These parameters can be obtained directly from the motor nameplate.
Frequency hopping: At a certain frequency, resonance may occur, especially when the entire device is relatively high. When controlling the compressor, the surge point of the compressor must be avoided.
We know that the synchronous speed expression of the AC motor is:
n=60f(1-s)/p(1)
In the formula
n --- speed of asynchronous motor;
f———frequency of asynchronous motor;
s --- motor slip;
p—The number of motor pole pairs.
By formula (1) we can see that the speed n is proportional to the frequency f, as long as the frequency f can be changed by changing the motor speed, when the frequency f in the range of 0 ~ 50Hz, the motor speed adjustment range is very wide. The frequency changer is to realize the speed adjustment by changing the frequency of the motor power supply, which is an ideal high-efficiency, high-performance speed control method.
Siemens different types of inverters, users can choose according to their actual process requirements and application of different types of inverter. When selecting the inverter, pay attention to the following points:
1. Select the inverter according to the load characteristics. If the load is a constant torque load, select the Siemens mmv/mdv, mm420/mm440 inverter. If the load is fan, the pump load should be selected Siemens 430 inverter.
2. When selecting the inverter, the actual motor current value should be used as the basis for the inverter selection. The rated power of the motor can only be used as a reference. In addition, it should be fully considered that the output of the inverter is rich in higher harmonics, which will degrade the power factor and efficiency of the motor. Therefore, comparing the use of frequency converters to power the motor and the power frequency grid, the motor current will increase by 10% and the temperature rise will increase by about 20%. Therefore, when selecting the motor and the frequency converter, this situation should be taken into account, leaving a margin to prevent excessive temperature rise and affecting the service life of the motor.
3. When the inverter is running a long cable, measures should be taken at this time to suppress the influence of long cable-to-ground coupling capacitance and to avoid insufficient output from the inverter. Therefore, the inverter should amplify one or two gears or install an output reactor at the output of the inverter.
4. When the inverter is used to control several motors in parallel, it must be considered that the total length of the cable from the inverter to the motor is within the allowable range of the inverter. If it exceeds the specified value, it is necessary to amplify the two gears to select the inverter. In this case, the control mode of the inverter can only be the v/f control mode, and the inverter cannot achieve the over-current and overload protection of the motor. Requires a fuse on each motor side for protection.
5, for some special applications, such as high ambient temperature, high switching frequency, high altitude, etc., this will cause the derating of the inverter, the inverter needs to amplify a block selection.
6. When using an inverter to control a high-speed motor, high-speed motors will produce more high-order harmonics due to their smaller reactance. These higher harmonics increase the output current of the inverter. Therefore, when selecting the inverter for high-speed motor, it should be slightly larger than the inverter of the ordinary motor.
7. When the inverter is used for pole-changing motor, full attention should be paid to selecting the capacity of the inverter so that the maximum rated current is below the rated output current of the inverter. In addition, when the pole number is converted during operation, the motor must be stopped first. Otherwise, the motor will run idle. In bad conditions, the inverter will be damaged.
8. When the explosion-proof motor is driven, the inverter has no explosion-proof structure and the inverter should be installed outside the dangerous place.
9. When using a frequency converter to drive a gear motor, the application range is limited by the lubrication method of the rotating part of the gear. When lubrication oil is lubricated, there is no limit in the low speed range; in the high speed range above the rated speed, there is a risk that the lubricant will run out. Therefore, do not exceed the maximum speed tolerance.
10. When the inverter drives the wound rotor asynchronous motor, most of the existing motors are used. Winding Motors Compared to ordinary squirrel cage motors, the winding resistance of the winding motor is small. Therefore, the overcurrent trip due to the ripple current is prone to occur. Therefore, a converter slightly larger than the normal capacity should be selected. The general winding motor is often used when the flywheel torque gd2 is large, and more attention should be paid when setting the acceleration/deceleration time.
Siemens inverter common fault analysis and treatment (1)In order to make a preliminary judgment on the quality of the inverter, we can first do a static test on it, mainly on the DC intermediate circuit and igbt detection, use a multimeter to detect whether the internal insurance is blown, the capacity of the intermediate filter capacitor and Whether the breakdown, igbt freewheeling diode is damaged and so on. Because the same type of alarm can be caused by the bottom board, the cuvc board, and the communication board, so do not make blind judgments when discovering faults. This can cause tedious work and wasted time.
1, e alarmSiemens inverter "e" alarm (according to the analysis of the reasons for: the bottom (15v too low), cuvc board (5v voltage is not transmitted to the designated location, cuvc board short circuit fault) and so on.
(1) Siemens frequency converter 6se7023-4ta61-z Symptom: The control panel pmu LCD display "e" alarm
Processing situation:
â— Replace the cuvc board and switch on the power, the LCD screen still shows "e" alarm, indicating that the fault is not on the cuvc board but on the backplane;
â— Check the backplane, measure the voltage of the backplane with a multimeter, and find that 15v is obviously low. Check the 8-pin soft start voltage is 0.5v (normal value is 3.85v) After checking the 5v normal, the q2 trigger voltage is normal, and use a multimeter to measure the q2 fault. After the new voltage returned to normal, 15v output is normal, restore the inverter wiring, input parameters, start the inverter running normally, see Figure 1.
(2) Siemens frequency converter 6se7016-1ta61-z Symptom: The control panel pmu LCD display "e" alarm
Processing situation: Replace the cuvc board to power on (see Figure 2). Everything is normal, indicating that the fault is on the cuvc board. Measure the three 1kΩ resistors associated with it. There is a value that has changed, and it will return to normal after the change.
(3) Siemens frequency converter 6se7021-0ta61-z Symptom: The control panel pmu LCD display "e" alarm
Treatment situation: check the floor 15v is not normal, serious too small, the floor has obvious overheating, disconnect 15v load, return to normal, obviously the fault is in its load, after being found to be a short circuit in the rear mos tube, the mos tube and its When the voltage regulator of the parallel connection is replaced with new one, the voltage is restored and the power transmission tester is normal.
(4) Siemens frequency converter 6se7016-1ta61-z Failure phenomenon: The control panel pmu LCD display "e" alarm
Processing situation: Replace the cuvc board and the fault disappears, indicating that the fault is in the cuvc board. Measure 1, 2 points (5v power supply end) with a multimeter resistance value of 320ω (normally 486ω). Prove that the circuit is short-circuited. Check d5. There are two feet directly breakdown, use the hot air gun to remove d5, put on a new (welding must be careful, do not have a man-made short circuit or open circuit) re-transmission test machine, fully returned to normal (see Figure 3).
Siemens inverter black screen general failure causes (power damage, igbt short-circuit caused internal insurance burned) and so on.
(1) 6se7023-4tc61-z Symptom: The control panel pmu LCD display is not displayed
Treatment situation: The internal igbt test has been seriously short-circuited, resulting in the internal insurance has been blown to lose power, replace igbt and repair trigger circuit to send power again, everything is normal.
(2) 6se7016-1ta61-z Symptom: The control panel pmu LCD display is not displayed
Processing situation: use an external 24v power supply test machine, the screen display is normal, and then use a multimeter to measure the low voltage AC output, no voltage shows the fault at the power supply, test uc3844 (6) pin pulse output is normal, there is no gate to q36, measured by the table r321 After changing from 28ω to infinity, the fault disappeared. See Figure 4.
"008" is the boot lock alarm, the inverter can not start, fault reason: after power on the inverter to test its test point, if the conditions are met, cuvc board output signal will charge resistors with parallel relay short seal, to the inverter Run it at a higher current, otherwise it will show "008" on the screen and it will not start.
(1) 6se7023-4ta61-z Symptom: The control panel pmu LCD shows "008" alarm
Processing situation: 30 (down) is 008 detection point (normal is 15v), measured 30 (bottom) is not 15v, k1 is already closed, check q3 emitter has 15v base voltage normal, suspect q3 damage, send power after new exchange, Everything is normal (see Figure 1).
(2) Siemens frequency converter 6se7022-4ta61-z Symptom: The control panel pmu LCD display "008" alarm
Treatment situation: replacement of the cuvc board is normal, indicating that the fault is in the cuvc. The damage caused by the connected r652 and r658 is checked. After the new test, everything is normal (see Figure 2).
4, f002 alarm6se7016-1ta61-z Symptom: The LCD panel of the control panel displays the alarm “f002†Low Voltage
Treatment situation: check bus dc 540v normal, indicating that the backplane voltage detection system is faulty, the detected 540v DC bus voltage through the resistor in series through tl084 signal to the cuvc board, if the detection voltage is lower than the value set by parameter p071 will stop the motor and Send out the alarm, use the voltage profile of the multimeter to measure the voltage at tl084 end (the normal value is 2.38v), and then use the 30 resistances of the resistance profile test to find that there are two signals that cannot be transmitted due to the corrosion has been broken. After the resistance is changed, the power is transmitted. The test run was normal (see Figure 5).
Inverter common faults can be divided into external faults and internal faults of the inverter according to different types of faults. When external faults occur, attention should be paid to faults caused by detection of external parameters of the inverter, external power supply, and motor. The internal fault of the inverter is divided into two aspects: soft fault and hardware fault. The external faults of the inverter are mainly of the following types:
(1) Incorrect parameter setting, the parameters set inside the inverter need to match with the driven motor. If the inverter parameters are not set properly or the settings are wrong, the inverter will not start normally.
(2) When the external wiring is faulty, the external wiring of the inverter will cause problems such as disconnection and plug damage after long-term use, which will affect the normal operation of the inverter.
(3) There is a problem with the external power supply of the inverter. When the external power supply of the inverter has problems such as “undervoltage, overvoltage, overcurrent, and overfrequencyâ€, the Siemens inverter will not operate normally.
(4) Overloading, causing Siemens inverter overload is mainly due to reasons such as too short acceleration time, excessive braking, or low grid voltage. This problem can be solved by extending the start-up acceleration time of the motor and extending the motor braking time. The overload caused by the motor can focus on checking the motor for stuck or other problems.
(5) Overcurrent, which causes Siemens inverter external overcurrent problems may be caused by a sudden change in the load of the motor, which may cause a large impact, or damage to the insulation of the motor or the power cable.
Siemens inverter software and hardware faults are mainly for the Siemens inverter itself, because Siemens inverters need to withstand high voltages and high currents for a long time, resulting in its internal hardware (control board control components, IGBT power components) Burned and damaged, which will affect the normal operation of Siemens inverter
Siemens frequency converter troubleshooting and troubleshootingWhen the Siemens inverter fails, first check the alarm information displayed on the digital tube on the Siemens inverter and check the alarm description of the Siemens inverter for the alarm information to locate the fault of the Siemens inverter. If you directly check a failed Siemens inverter, you must first use a multimeter to measure the Siemens inverter at the beginning of the power-up check. Use a multimeter to check the power components such as rectifier bridges and IGBT modules in Siemens inverters and check whether there are obvious burn marks in the Siemens inverter. When using a multimeter to check the power components, the multimeter is set to 1K resistor, the black meter is connected to the DC (-) pole of the Siemens inverter, and then the red meter of the multimeter is used to connect the three inputs of the Siemens inverter. Measure the resistance at the output end. Measured resistance value should be between 5-10K and the input and output phases should be consistent with each other. The three-phase resistance at the output end should be slightly less than the input resistance value, and the (-) test is completed. After the resistance measurement, continue to place the black pen in the (+) test to continue the three-phase measurement. The measurement method is the same as above. If the measured resistance value is normal, there is no charge or discharge phenomenon, which indicates that the Siemens inverter can be powered on. If not, then Means that Siemens inverter power components damage need to replace the parts that have a problem in measurement, especially Siemens inverter power components in the obvious signs of burnt Siemens inverter can not be powered directly.
After the initial measurement of the Siemens frequency converter is completed, the Siemens frequency converter needs to be powered on, taking the MM4 frequency converter in the Siemens frequency converter as an example:
(1) After the power supply Siemens inverter on the digital tube shows the F231 fault, it means Siemens inverter power driver board or the main control board there is a problem, you can replace the Siemens inverter power drive board or Is the main control board to test.
(2) After the Siemens inverter is powered on, if the panel does not display or the indicator under the panel does not light, it means that there is a problem in the rectifier power supply part of the Siemens inverter, and the power supply part in the Siemens inverter should be tested. Use a multimeter to test the rectifier diodes in the rectifier section of the Siemens inverter and find that the problematic diodes can be replaced directly to solve the problem.
(3) If the display of Siemens inverter is (------) after power-up, most of them means that there is a problem with the main control board in the Siemens inverter, which can be solved by replacing the main control board of the Siemens inverter. The main reason for this type of failure is due to the presence of large clutter in the external access line of the Siemens inverter, which causes damage to the resistance and capacitance of the main control board of the Siemens drive. In the process of working with Siemens converters, large heat will also be generated. If the main control board of the Siemens inverter is not well dissipated, the electronic components on the main control board will be burned.
(4) After the Siemens inverter is powered on, no matter whether it is no-load operation or load operation, an over-current alarm will be displayed on the Siemens inverter. When such a fault occurs, it usually means that the IGBT power components in the Siemens inverter are damaged. , Siemens inverter power components and drive parts should be measured in detail, detect the power and drive components in question, replace the new parts and then detailed measurement before re-power, if the drive part of the problem will result The newly replaced IGBT in the Siemens inverter is burned again after being powered on. The main cause of such failures is due to multiple overloads in the process of using Siemens inverters or Siemens inverters in a situation of large voltage fluctuations for a long time, resulting in the destruction of the devices in Siemens inverters. The external circuit of the Siemens inverter needs to be inspected to check whether the motor is normal, and a voltage protection device is installed at the incoming end of the Siemens inverter to prevent the Siemens inverter from being burned.
(5) In the process of using a Siemens inverter, there is often a “stop†without warning. After a restart, it may be normal. After the Siemens inverter is removed, no problems are found after testing the devices. After a long period of observation after the Siemens inverter was powered on, it was found that during the working process of the Siemens inverter, there was a problem that the main contactor was abnormal during the operation, resulting in the inability of the Siemens inverter to work for a period of time. Keeping the pull-in state and causing problems such as power-failure and random jump, the main reason for this failure after unplugging the main contactor of the Siemens frequency converter is that the switching power supply in the Siemens frequency converter is always connected with the main contactor wire package. The filter capacitor leakage, resulting in low voltage, resulting in failure to properly pull in, such as the problem of high supply voltage can also cover up the past and when the voltage is lower, the problem will be more obvious exposure. After analyzing the common faults of Siemens inverters, it is found that the proportion of the power components in the Siemens inverters is not high, but the proportion of control devices such as resistors and capacitors is high. Take care when troubleshooting.
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