Because inverters are widely used, there are many differences in the corresponding types and specifications. We are broadly divided into two categories: voltage and current. The current type of inverter products is characterized by the use of a large inductor as the energy storage link in the middle DC link, and the reactive power will be buffered by this inductor. The advantage is that when the motor is in the regenerative power generation condition, the regenerative power fed back to the DC side can be easily fed back to the communication grid, and no additional equipment is required in the main circuit.
There are two main ways to regulate the output voltage AM type (pulse amplitude conditioning type) and PWM type (pulse width conditioning type). The PAM form has a simple control loop and is mainly used for thyristors. The disadvantage is that the capacitance is large and the voltage control response is slow, making it unsuitable for systems that require rapid acceleration and deceleration. The PWM form has a fast response and can respond with carrier frequency.
Its biggest advantage is that the open-loop of the automatic control loop can complete the voltage control, while the PAM control needs to form a closed loop. Its disadvantage is that in addition to the fundamental voltage, it also contains many higher harmonics, which makes the motor very noisy. However, it is possible to use transistors with higher switching frequencies, which greatly reduces the noise of the motor.
According to the control method, there are two control methods: open-loop control and closed-loop control. Closed-loop control requires motor speed response and speed detection. Open-loop control has V/f control form, no speed detection. The choice of frequency converter depends on the requirements of the load. With regard to square torque loads, the load torque is small at low speeds, and it is usually possible to select a general utility type. Regarding constant torque loads, there are two cases: adding the capacity of the motor and inverter products to add low-speed torque; Frequency conversion products with torque control function are used to complete the speed regulation operation of constant torque load.
Here is an example of the inverter used in industrial washing machinery, and its main intention is to change the speed of the motor to achieve the intention of application. Therefore, the following points should be considered when selecting: motor speedThe load driven by the motor must bear the torque supplied by the motor, and its value is suitable for the function and loss of the machinery at this speed.
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Inverter installation and heat dissipation treatment - Reynolds
The inverter has power loss during operation and converts it into heat energy, which increases its own temperature. Roughly speaking, the power loss of every 1kVA inverter capacity is about 40W-50W. Therefore, when installing the inverter, it is necessary to consider the heat dissipation of the inverter, and how to run the inverter.
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Reynolds drives RNB1000 series fault code resolution
Reynolds inverter fault codes:
E.bC
Reynolds inverter fault phenomenon/type:
Brake unit failure
Reynolds inverter failure may be caused:
1. Brake line failure or brake ...
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The inverter prepares the braking resistance factor – Reynolds
The preparation of the braking resistor of the inverter is mainly to consume part of the energy on the DC bus capacitor through the braking resistor to avoid the capacitor voltage being too high. Theoretically, if the capacitor stores a large amount of energy, it can be used to release it to drive the motor and avoid energy waste. However, the capacitance of the capacitor is ...
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How long is the cable between the inverter and the motor allowed - Reynolds
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, the higher harmonics will increase the output current of the inverter, causing the motor winding to heat up.
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Protection function of the Reynolds soft starter
1. Overload protection function: The soft starter introduces a current control loop, so that the change of motor current can be tracked and detected at any time. By increasing the setting of overload current and the anti-time control mode, the overload protection function is realized, so that when the motor is overloaded, the thyristor is turned off and an alarm signal is issued.
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Reynolds inverter manual
Reynolds inverter brochure (partial)
Before installing
When unpacking, it is found that the machine has water or left water traces, indicating that the inverter has been flooded, so please do not install and use it.
When unpacking, it is found that the machine is damaged and deformed or the parts are missing, please do not install and use it, otherwise there will be fault expansion and personnel ...
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Applicable mode of inverter maintenance - Reynolds inverter
CNC cutting machine
1. Gradual reduction method
The so-called gradual reduction method is to narrow the scope of shortcomings step by step by elaborating the shortcomings and judging the measurement parameters.
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Soft start uses common faults and solutions - Reynolds
In the process of daily use of soft starters, it is inevitable to encounter some improper use or failure of soft starters in the process of use
1. The user starts ...
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Soft-start starting method – Reynolds
1) Ramp boost soft start. This starting method is simple, does not have current closed-loop control, and only adjusts the conduction angle of the thyristor to make it add a certain function with time. The disadvantage is that because there is no current limit, in the process of motor starting, sometimes a large impulse current is generated.
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Inverter power modification method - Reynolds
1. Yaskawa inverter G5-G7 power correction: enter the menu and then return to 02-04 after A01=4 is the power data, and the factory voltage of rehabilitation has also changed after the change.
2. Sanken inverter IHF-IPF-SHF series: enter the CD900 parameter and enter 365 to confirm (change 2 times...
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Dust design considerations for frequency converters - Reynolds frequency converters
1) The air duct of the inverter cabinet should be planned reasonably, and the exhaust should be clear and smooth, so as to avoid the formation of vortex in the cabinet and the accumulation of dust in a fixed direction.
2) The top air outlet of the inverter cabinet should be equipped with a protective top cover to avoid debris from falling directly.
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Reynolds-5G empowers the paper industry to improve quality and efficiency of the industrial IoT control system
From September 23rd to September 25th, 2020, the 2020 China International Paper Technology Exhibition was held in Hall D1 of Suzhou International Expo Center.
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Lightning protection measures for Reynolds frequency converters
The lightning protection measures of the inverter equipment are another important peripheral measure to ensure the safe operation of the inverter, especially in the area where lightning is active or in the lively season, this problem is particularly important.
Today's inverter products are generally equipped with mines.
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The internal structure of the inverter is the role of Reynolds
The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to communication), braking unit, drive unit, detection unit and microprocessor unit.
The inverter adjusts the voltage and frequency of the output power supply by the internal IGBT break, and ...
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Key points for the selection of AC contactors - Reynolds
1. Select varieties according to the above series according to the purpose and requirements of use
Note that the main circuit load type is strictly differentiated, whether it is DC or communication.
The communication contactor is different from the DC contactor, and is only suitable for DC-1 to DC-5 loads when used for DC loads.
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The difference between heavy-duty inverter and light-duty inverter
1. The starting time is different: light load generally refers to the small inertia of the equipment load, and the energy storage balance time of the demand for start-up is short, that is, the starting time is short. Heavy load generally refers to the long time of energy storage balance when the equipment load inertia is large and needs to be turned on, that is, the time of start-up.
2. The requirements for working current are not ...
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Structural characteristics of Reynolds RHY series inverter governor
1. Technology: (PC or PLC) is used to make the equipment complete the intelligent constant pressure variable supply water supply according to the requirements of water supply and fire protection;
2. High efficiency and energy saving: the system can set the pressure according to the demand, and the system actively adjusts the speed of the pump and the number of pumps according to the set pressure, so that the equipment can run in ...
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The factor that causes the breakdown of the inverter – Reynolds
1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage formed due to various reasons exceeds the additional voltage, which is concentrated in the DC voltage of the inverter DC bus.
The overvoltage alarm generally appears at the time of shutdown, and its main ...
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General Purpose Inverter Repair Inspection – Reynolds
The first step is to check whether the appearance of the inverter is defective, including whether the indicator light is in normal operation, whether the mission control function of the operation panel is complete, and carefully observe the appearance of the inverter under the operating condition, and do the corresponding recording operation; When repairing the inverter, check whether the voltage value and current value exceed the ...
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The lightning protection method of Reynolds inverter
The lightning protection measures of the inverter equipment are another important peripheral measure to ensure the safe operation of the inverter, especially in the area where lightning is active or in the lively season, this problem is particularly important.
Today's inverter products are generally equipped with lightning ...
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