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What is the role of the inverter input, output end of the installation of the contactor and the reac
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What is the role of the inverter input, output end of the installation of the contactor and the reactor?Inverter can be contactor and reactors at the end of the input is a normal configuration, contactor is relatively so switching power supply, in case of emergency use contactor directly to stop the inverter power supply, adds the reactor is to protect the rectifying block, and plays a role in smoothing the voltage spike.
Plus the output end of the reactor is inverter and motor distance far situation, and the contactor if is a trailer for a situation is no need to add, and with no benefits, in the inverter and motor is Yituo Tuesday with a prepared case is need and the contactor to conversion of electrical machine and control when in need to let contactor sucking action, using contactor normally open contact as one of the conditions of the inverter operation.
Purpose of using the power supply side contactor: power once the power is turned off automatically to frequency converter is disengaged from the power supply, lest in the state of the external terminal control to power supply inverter itself, to protect equipment safety and personal safety; internal protection function of inverter in the work, through the contactor to inverter is disengaged from the power supply.
Please note that when using, don't electromagnetic contactor were frequently starting or stopping (converter input circuit switching life is about 10 million times), not electromagnetic contactor with power supply side of the stop frequency converter
Selection and use of suitable reactors and matching converter can suppress the harmonic current, reduced total harmonic produced by frequency converter system, improve the power factor of inverter, and can suppress from the impact of the surge current to the grid of the inverter, inverter protection and reduce motor noise. Reliable operation of inverter and motor.
Line reactor La1 connected between the power supply and frequency converter, and it can limit the power grid voltage mutation and operating over-voltage caused by the impact of current, effective protection of the inverter, improve power factor of inverter, inverter input power grid harmonic current suppression, substantially cut 5, 7, 11, 13 harmonic.
The main purpose and function of the output reactor is to compensate the effect of the long line distribution capacitance, and to suppress the harmonic components of the universal frequency conversion output, which plays a role in reducing the noise of the converter. Output reactor installed in close proximity between the inverter and the output end of the motor, to compensate the motor and cable relative phase and relative between distribution of parasitic capacitance, which can extend the motor cable wiring length. In general, the general inverter manufacturers are allowed to connect the maximum length of the motor cable, the use of the provisions of the product specification should be referred to.
1, input reactor into line reactor: input reactor can suppress the harmonic current, improve the power factor and weaken the impact of surge voltage and current in the input circuit of the inverter, weaken the influence of unbalanced supply voltage, under normal circumstances must add the line reactor.
If the front end of the inverter, separately for the power supply of transformer winding, without adding line reactor; if the front end of the inverter, there is no separate for the power supply of transformer winding, it must add the line reactor, otherwise, affect the frequency of normal operation.
2, output reactor reactor output: when the inverter output to the motor cable length is greater than the product of the specified value, and output reactor to compensate motor with long cable runs when the coupling capacitance charge and discharge, avoid inverter overcurrent. There are two types of the output reactor, one kind of the output reactor is the core type reactor, the frequency converter of the carrier frequency is less than 3KHZ. Another kind of output reactor is the ferrite type, when the frequency converter of the carrier frequency is less than 6KHZ. Produced in the inverter output increase output reactor to increase the frequency converter to motor wire distance and output reactor can effectively inhibit the inverter IGBT switching transient high voltage, reduce the adverse effects of the motor and the voltage on the cable insulation. Also in order to increase the frequency converter to the distance between the motor can appropriate bold cable, the increase of cable insulation strength, try to use non shielded cable.
3, the input of the end of the contactor, as long as the frequency of the inverter is not frequent. The output contactor, output in the end will there ever be voltage (perceptual motor load) role in power components, although there are absorbing circuit and overvoltage protection, resulting in failure is not inevitable, but should be avoided. So is the best, even if you want to add to in the inverter output to disconnect, but also to do chain prevent the inverter output is connected, otherwise large current will burn the IGBT.
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