The outstanding quality, complete function, compact design and simple operation and installation of Lenze inverter represent the new trend of modern inverter development. Today, we will discuss some common faults encountered in the maintenance process of lenze inverters, for the majority of users in the maintenance and use of lenze inverter as a reference:
1. The pulse transformer is damaged.
For the early 8100 series 8300 series inverters, our common faults are switching power supply damage, most of which are pulse transformer damage. The phenomenon reflected is that the machine has no reaction after power-on, and the control terminal has no voltage. Since the skeleton of the pulse transformer is not easy to disassemble, it has caused certain difficulties for the repair of the transformer. The parameters of the pulse transformer used by each inverter brand are not the same, which brings some difficulties to our winding, if there is no accessory. Sources are generally not easy to repair in this case. Since there is relatively little market for such machines, we will not discuss them in detail.
2. oc5 failure.
The oc5 fault should be a fault phenomenon that we often encounter in the repair of the 8220/8240 series inverter. Oc5 is the inverter overload, overload detection is generally done by the Hall sensor, by detecting the current of the two phases of the uv, and then by the two input or the door comos circuit to determine whether the inverter is overloaded. The fault point of oc5 is usually caused by damage of the sensor and damage of the door circuit. The Hall sensor is easily affected by the environment, and the drift of the working point occurs. The gate circuit is often damaged by the working voltage and the impact of the input signal. Replacing a damaged device should eliminate such failures.
3. Output phase loss.
Output phase loss is also one of the faults we often encounter. We all know that in the phase loss state, it is impossible to drag the three-phase asynchronous motor. In the case of dragging the motor, an overcurrent alarm will occur. After disconnecting the motor, the 3-phase output voltage is measured, which is often the phase difference of the 3-phase output voltage. Larger, this time you should first check if the power module is damaged and the drive waveform is normal. In the lenze8240 series inverters, it is often the case that the drive circuit has no voltage. The switching power supply is a circuit that must be checked. 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 the driving circuit and the switching power supply are isolated. So we must also check the isolation transformer for problems. To eliminate the above faults, it should be possible to determine whether the power supply of the drive circuit is normal.
4. The switching power supply is faulty.
In the maintenance of the 8200 series universal inverter, we often encounter damage to the switching power supply. The fault points mainly include damage of the power switch tube and damage of the switching power supply control circuit. The damage of the switch tube is easy to replace. The original type transistor and its replacement transistor can be bought. The repair circuit is relatively complicated after the failure of the control circuit. The control circuit components of this type of machine are integrated on the insulating ceramic piece, which is not easy to replace. Have some experience and maintenance skills.
5. The fault caused by the heat dissipation of the inverter.
The heat sink separation heat dissipation technology is also a big selling point of the lennze inverter. Everyone knows that the conventional inverter has cooling fan cooling, but in some occasions, the cooling fan often becomes a common fault point of the inverter. This phenomenon is mainly seen in textile factories. The cotton wool and chemical fiber in the air of the textile factory often block the fan, causing the inverter to fail alarm. The lenze inverter's heat sink separation heat dissipation technology just solves this problem. However, we also encounter the phenomenon that the inverter can not afford heavy load after using for a period of time. 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 susceptible to aging. The loss is faster. Generally, in this case, replacing the aging device can solve this problem. In addition, in practical applications, we can also judge the status and fault of the inverter according to the state of the LED of the inverter, especially in the case of no panel. Generally, when the green light is on and the red light is off, it is in the operating state of the control panel. The green light flashes and the red light is on the control panel forbidden control. The green light is off and the red light flashes once every second. At this time, the inverter is in a fault state.
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leakage breaker is suitable for the leakage protection of the line of AC 50/60Hz, rated voltage single phase 240V, rated current up to 63A. When there is human electricity shock or if the leakage current of the line exceeds the prescribed value, it will automatically cut off the power within 0.1s to protect human safety and prevent the accident due to the current leakage.
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