The operating principle of the inverter determines that it will have a certain disturbance, which may bring EMC (electromagnetic compatibility) problems to the equipment or system, and the inverter, as an electronic device, will also be affected by external electromagnetic disturbance.
The following describes some EMC-compliant equipment planning methods for inverter field equipment and wiring.
1. The electromagnetic disturbance countermeasures are as follows: Disturbance transmission path Reduction of impact countermeasures Leakage current Grounding loop When the peripheral equipment is routed through the inverter to form a closed loop, the leakage current of the inverter grounding wire will cause the equipment to malfunction. If the device is not grounded at this moment, it will reduce malfunction. Power line communication When the peripheral equipment and the inverter share the same power supply, the disturbance of the inverter is reversed by the power line transmission, which will cause other equipment in the same system to malfunction.
The following methods may be adopted:
(1) The input device of the inverter is an EMI filter or a ferrite common-mode filter (magnetic ring).
(2) Other equipment is blocked by blocking the noise with a barrier transformer or power filter. Motor line radiation Power line radiation Inverter radiation The equipment or signal line that measures weak signals such as appearance, radio equipment, and sensors is installed in the same cabinet as the inverter, and the wiring is very close, and the malfunction occurs simply due to space disturbance, and the following countermeasures need to be adopted:
(1) Simply affected equipment and signal lines should be kept away from inverter equipment as far as possible. The signal line should be shielded wire, the shield layer should be grounded, the signal line cable should be sleeved into the metal pipe, and should be as far away as possible from the inverter and the input and output lines of the inverter. If the signal cable has to cross the power cable, it needs to be straight.
(2) Separate the EMI filter or ferrite common-mode filter (magnetic ring) on the input and output sides of the inverter.
(3) The motor cable should be placed in a barrier of a larger thickness, such as a pipe of a larger thickness (more than 2mm) or buried in a cement tank. The power line is sleeved into a metal pipe and shielded and grounded (4-core cable is used for the motor cable, one of which is grounded on the inverter side and the motor housing on the other side).
Electrostatic induction Electromagnetic induction
(1) Prevent the signal line and the power line from being routed in parallel or bundled with the power line.
(2) Keep the simply affected equipment or signal lines as far away as possible from the inverter and the input and output lines of the inverter.
(3) The signal line and power line are shielded wires, and the metal pipes are separated from each other, and the distance between the metal pipes is at least 20cm. 183 Equipment & Wiring
2. Leakage current and its countermeasures Due to the existence of the ground capacitance of the input and output cables of the inverter, the interline capacitance and the motor to the ground, the leakage current will occur. Leakage current includes leakage current to ground and interline leakage current, and its size depends on the size of the distributed capacitance and the level of carrier frequency.
Leakage currents can flow not only into the drive system, but also through the ground wire to other devices, which may malfunction the circuit breakers, relays, or other equipment. The higher the carrier frequency of the inverter, the greater the leakage current; The longer the motor cable, the greater the leakage current. Method: The carrier frequency is reduced, but the motor noise is added; The motor cable is as short as possible; Frequency converter systems and other systems are used as residual current circuit breakers designed for high harmonics and inrush leakage currents. Inter-line leakage current flows through the leakage current of the distributed capacitance between the cables on the output side of the inverter, and its higher harmonics may make the external thermal relay malfunction, especially the small volume inverter, when the wiring is very long (more than 50m), the leakage current is added a lot, and it is easy to make the external thermal relay malfunction, it is recommended to use the temperature sensor to directly monitor the motor temperature or use the motor overload maintenance function of the inverter itself to replace the external thermal relay. Method: Downgrade carrier frequency; A reactor is installed on the output side.
|
More on that
|
Sunland inverters are designed for environmental requirements
1. The ambient temperature ---- is generally "-10-+40°C"; Derating between 40 and 50°C, the additional output current must be reduced by 1% for every 1°C increase. If the ambient temperature is too high and the temperature changes greatly, the insulation of the inverter will be greatly reduced, which will affect the life of the inverter.
...
|
|
Senlan inverter multi-stage speed parameter setting
The external terminals of the inverter, RH, RM, RL, are speed control terminals. Through the combination of these terminals, three-speed and seven-speed control can be completed. In addition, the other terminals can be redefined, and the fifteen-speed speed can be controlled.
...
|
|
According to the load characteristics, choose the inverter - Senland
The types of production machinery are complex, the functional and process requirements are different, and the torque characteristics are also different, therefore, before the application of the inverter, the first thing is to understand the nature of the load carried by the motor, that is, the load characteristics, and then select the inverter and the motor. There are three types of loads: ...
|
|
Overload trip analysis of an inverter
The motor is able to rotate, but the operating current exceeds the rated value, which is called an overload. The fundamental reflection of overload is that although the current exceeds the rated value, the fluctuation of the excess is not large, and it generally does not constitute a large inrush current.
1. The main reason for overload
(1) Excessive mechanical load ...
|
|
The device inside the inverter that needs to be replaced regularly - Sunland
1. Cooling fan
As a prerequisite to ensure the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.
|
|
The difference between inverter and inverter power supply - Senland
What is a frequency converter?
Variable Frequency Drive (VFD) uses inverter technology and microelectronics to change the operating power frequency of the motor to control the power control unit of the communication motor.
The inverter is mainly composed of rectifier (from communication to DC), inverter, inverter (from DC to communication) ...
|
|
Inverter load type - Sunland inverter
(1). Constant torque load
Different speeds, load resistance and torque base are stable. The output power is directly proportional to the rotational speed. Such as belt conveyors.
(2). Constant power load
Different speeds, stable load power base ...
|
|
Inverter with no-load operation and commissioning - Senlan
(1) Set the power of the motor, the number of pole pairs, and check the operating current of the inverter.
(2) Set the maximum output frequency and base frequency of the inverter and set the torque characteristics of the motor. Pressure/Frequency (V/F) Operators ...
|
|
Inverter remote control wiring method - Senlan
1. Connect X (switching input) drive terminal to control the inverter start-stop/forward and reverse rotation;
2. Connect to the AI (analog input) terminal to control the frequency of the inverter (perhaps made into PID closed-loop control active conditioning frequency)
3. Other DO (switching output) is used for transmission ...
|
|
Rapid selection method of low-voltage inverter - Sunland inverter
First, according to the classification and selection of inverters
1. Inverters can be divided into general-purpose inverters and special inverters.
2. General-purpose inverters are mainly used in: general fan pumps (referring to inverters that only drag a single fan or pump) loads, mechanical loads, and loads requiring high overloads.
|
|
Inverter parameter setting method - Senlan
1. Control method:
i.e. speed control, rotation control, PID control, or other methods. After the control method is adopted, it is generally necessary to carry out static or dynamic identification according to the control accuracy.
2. Minimum operating frequency:
That is, the minimum speed of the motor operation, the motor at low speed ...
|
|
Inverter device inspection and maintenance work steps
1. Preparation process:
Abort the device and admit that the motor is completely aborted.
Press the stop button on the operator panel to stop the operation.
Disconnect the external mains power supply (low-voltage cabinet drawer). Adequate security treatment should be carried out to ensure that it is indeed disconnected and that it does not ...
|
|
I hope that Senlan will make a wonderful appearance at the 22nd (Shanghai) Industry Fair
From September 15th to 19th, the 22nd China International Industry Fair was held at the National Convention and Exhibition Center (Shanghai). As the first national industrial exhibition held under the normalization of epidemic prevention and control this year, the theme of this expo is "Intelligence, Interconnection: Enabling the New Development of Industries".
|
|
Common problems in the use of inverter - Sunland inverter
1. Please explain the maintenance function of the inverter?
(1) After detecting the abnormal situation, the correction action will be carried out automatically, such as overcurrent loss rate prevention, regeneration overvoltage stall prevention.
(2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor can park automatically. As...
|
|
A contactor is used between the inverter and the motor - Senlan inverter
Whether a contactor is used between the inverter (VFD) and the motor depends on the specific situation. When the contactor is on and off when the motor is running, the operating overvoltage is easy to cause VFD damage. Therefore, whether to use the contactor, it must be based on the actual situation to make the correct ...
|
|
Hope Sunland inverter EMC rules
When various factory equipment uses frequency conversion speed regulation, harmonic disturbances will be generated on the power supply side and motor side of the inverter (VFD), which will cause electromagnetic disturbance to the power supply network and other electrical equipment near the VFD. In addition, in order to ensure the long-term reliable operation of the VFD, the wiring of the VFD is very important.
...
|
|
Hope Senlan inverter control panel button function diagram
Hope Senlan inverter control panel button function diagram
1. The "FUNC/DATA" button is a programming key, press this button once to convert the operation mode, and press it again to read and write the utility code.
2."S ...
|
|
Introduction of Sunland inverter
1. Obtain accurate motor parameters from low to high parameters at different frequencies, and establish motor models of corresponding frequency bands in different frequency segments, so that the inverter can control the motor from low to high.
2. V/F control
(1) It is possible to select 15 pre-set V/...
|
|
Senlan SV1000 servo drive wearing parts replacement
The wearing parts of the driver mainly include electrolytic capacitors for filtering and cooling fans, and their service life is closely related to the environment and maintenance of the operation.
Depending on the operating moment, the user can determine whether a wear part needs to be replaced.
Cooling ...
|
|
Inverter heat dissipation treatment in use - Sunland inverter
If you want to make the inverter last a long time, you must seriously consider the problem of heat dissipation. Because the failure rate of the inverter increases exponentially with the increase of temperature, the service life decreases exponentially with the increase of temperature. A 10 degree increase in ambient temperature halves the service life of the inverter. Thus...
|
|
Contact
working hours
