Many people are not familiar with the detection of Hall components. When repairing, it is often necessary to judge whether it is good or bad. Hall element has power supply, signal output terminal, according to my maintenance experience, it is best to measure its output voltage. When the inverter is in STOP state, the current should be 0. At this time, the Hall output voltage should also be 0V, if the measured voltage Yes, generally this is broken, measuring resistance and normal Hall contrast is also a method, but the actual appearance of bad Hall and good resistance are not much difference, its fault is generally the above potentiometer resistance Due to the change of value, the sampling voltage point changes, the CPU detects the protection by mistake. Do not try to repair the Hall. If it is not good, the module will be blown up. Checking the output voltage on the way is the best method.
A machine display code CFF, the manual means that the line is abnormal, but the machine is not bad, the analysis is the detection part of the fault, the machine in the STOP state, check the Hall's output voltage, found that only Hall output has 1V, After replacing this, the machine is normal.
Hall element input and output are proportional relationship, it detects the object is current, such as 1000:1 Hall, safety light curtain, inverter output is 50A current, displacement sensor, Hall output 50MA current, and detection voltage Change, the magnitude of the change is proportional to the current, and is related to the impedance of the device. It is very troublesome to check the output current when repairing the machine. Generally, it is convenient to check the voltage. Hall is generally 4 feet, 2 feet are Hall's power supply, 2 are the detection output. As long as you understand the principle of its work, you can judge whether it is good or bad.
What is the output voltage range of a typical Hall sensor?
The rated current of the inverter corresponds to 2.2v, the overload point is 3.3v, and the overcurrent current is 4.4v. The current sensor of the inverter is generally prepared according to the above requirements. 100Aat4v is 100A when the positive and negative 4V, if there is an amplifier circuit Then carry out the conversion? Replace the current sensor should be implemented according to the above requirements?
After the 15KW machine Hall is broken, you can use the 200A/4V domestic belt to change. Note that the power supply wiring is +_15V?
(1) Damage to the pulse transformer
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.
(2) OC5 failure
The OC5 fault should be a fault phenomenon that we often encounter in the 8220/8240 series inverters. OC5 is the overload of the inverter, and the overload detection is generally completed by the sensor. By detecting the current of the two phases of the UV, the two-input or gate COMOS circuit is used to judge whether the inverter is overloaded.
(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. bigger. In the LENZE8240 series inverters, it is often the case that the drive circuit has no voltage.
(4) Switching power supply failure
In the maintenance of the 8200 series general-purpose inverter, we often encounter damage to the switching power supply. The fault point mainly has the damage of the switching power supply control circuit. The repair of the control circuit is relatively complicated. The control circuit components of this type of machine are integrated on the insulating ceramic piece, which is not easy to replace, and requires certain experience and maintenance skills.
(5) Fault caused by heat dissipation of the inverter
The heat sink separation heat dissipation technology is also a big selling point of 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 solves this problem. However, we also encounter the phenomenon that the inverter can not afford heavy load after using for a period of time. The analysis from our experience may also be caused by the heat dissipation problem of the inverter.