The voltage waveform output by the inverter is only similar to a sine wave, but not a real sine wave, and its waveform contains a large number of harmonic components.
As we all know, higher harmonics will increase the output current of the inverter, causing the motor winding to heat up, oscillation and noise, accelerating the aging of the insulation, and even possibly damaging the motor. Together, harmonics of various frequencies will emit radio interference from different programs into space, which may cause malfunction of other electromechanical equipment.
Therefore, when installing the inverter, it is necessary to comprehensively consider the interval between the central control room, the inverter and the motor, so as to reduce the influence of harmonics as much as possible and improve the stability of control.
1. Near spacing: the spacing between the inverter and the motor ≤ 20m;
2. Central separation: the interval between the inverter and the motor > 20m, and the ≤ is 100m;
3. Remote spacing: the spacing between the inverter and the motor > 100m;
#工业使用现场的场合#
1. Near spacing: the inverter and the motor can be directly connected;
2. Central separation: the inverter and the motor can be directly connected, but the carrier frequency of the inverter needs to be adjusted to reduce the harmonic interference;
3. Remote spacing: The inverter and the motor can be directly connected, not only the carrier frequency of the inverter needs to be adjusted to reduce the harmonic interference, but also the output AC reactor needs to be installed.
In a highly automated factory, all equipment needs to be monitored and controlled in a central control room. Therefore, the signal of the inverter system should also be sent to the central control room.
1. Near interval: that is, if the inverter is installed in the central control room. The control console and the inverter can be directly connected and controlled by a voltage signal of 0-5/10V and some switching signals. However, the electromagnetic radiation of the high-frequency switching signal of the inverter will interfere with the weak current control signal, so it does not have to be beautiful and neat, and the inverter is placed in the central control room;
2. Central separation: that is, the inverter is far away from the central control room, and the current signal of 4-20mA and some switching quantities can be selected for control connection; If the interval is farther, RS485 serial communication method can be used to connect;
3. Far spacing: that is, the interval between the inverter and the central control room is greater than 100m. At this time, it is possible to reach an interval of 1km using a communication center relay; If it is farther away, you need to choose a fiber optic adapter, which can reach up to 23km.
The communication cable connection can easily form a multi-stage drive control system, so as to complete the requirements of master/slave and synchronous control. Connecting with the fieldbus system that is now prevalent will greatly improve the data conversion rate. The extension of the interval between the central control room and the inverter cabinet is conducive to shortening the interval between the inverter and the motor, so as to improve the performance of the system with a more reasonable layout.
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