(1) The starting torque is large and the power factor is high. Because the power factor of the motor is related to the working frequency, the power factor under the power frequency power supply is much lower than that under the low-frequency power supply when the motor is running at low speed. The inverter can control the motor to start from low frequency, and always maintain a relatively high power factor and output torque close to the extra torque during the whole starting process under the condition of close to the additional current.
(2) Under the condition of light load or no load, or when measures such as load reduction and unloading are adopted during the start-up period, the capacity of the inverter can be smaller than that of the motor. Of course, after the start is completed, the inverter needs to be withdrawn from operation.
(3) The starting current is small. The inverter-motor drag system allows for a long starting time. Because during this period, the motor current can not exceed the additional current of the motor, so there is no abnormal heat generation of the inverter, motor or other components. Because the starting current is small, the required distribution capacity is also the smallest of all generating methods.
(4) The motor controlled by the inverter has outstanding dynamic and static functions. Because the inverter itself is a device used for motor speed regulation, therefore, controlling the speed of the motor is its basic function, and the starting process can be arbitrarily controlled, and theoretically any starting speed curve can be set artificially at will, which is an advantage that other methods do not have.
(5) When dragging multiple motors with an inverter to start, even if the capacity of the dragged motor is quite different, it will not affect its starting function.
(6) After the start is completed, for the motor, a power supply switching process is required, and the power supply from the frequency converter is switched to the power supply of the power grid. In the whole process, there will be inverter safety, current shocks, for example. speed changes and other issues. In short, there is a switching problem, and the so-called soft switching is a safe and smooth switching.
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The heat dissipation method of Reynolds switching power supply
1. Transfer heat pipes for heat dissipation.
In many applications, the heat generated from the base steel plate of the power module is transferred through the heat transfer components to the distant heat pipe surface. In this way, the temperature of the base steel plate of the power module will be equal to the temperature of the heat pipe heat dissipation surface, the temperature of the heat transfer parts, and the temperature of the two contact ...
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The heat dissipation method of the switching power supply
1. Transfer heat pipes for heat dissipation.
In many applications, heat generated from the base steel plate of the power module is transferred through the heat transfer components to the distant surface of the heat pipe. In this way, the temperature of the base steel plate of the power module will be equal to the temperature of the heat pipe heat dissipation surface, the temperature of the heat transfer parts, and the temperature of the two contact ...
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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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The item that needs to be maintained after the inverter is shut down – Reynolds
1. Use a vacuum cleaner with a plastic nozzle to thoroughly clean the inside and outside of the inverter cabinet to ensure that there is no excessive dust around the equipment.
2. Check the ventilation and lighting of the frequency conversion room, and the ventilation equipment can operate normally.
3. Check the inverter ...
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Reynolds soft starter problem solving
1. The soft starter does not start and the fault-free code appears, perhaps because the control power supply is not connected, the solution is to check the power supply of the control power supply to see if the circuit connection is correct.
2. The motor starts when the motor announces a hum/no start signal, perhaps because of the thyristor/module ...
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The structure of the low-voltage circuit breaker - Reynolds
Low-voltage air circuit breaker, also known as active air switch or air switch, belongs to the switch electrical appliance, is used when the circuit is overloaded, short circuit and undervoltage can actively break the circuit of the electrical appliances, can also be used as infrequent start of the motor or opening and closing circuit, low-voltage air circuit breaker has an all-round circuit breaker ...
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The difference between servo and inverter - Reynolds
Overload can be different
Servo drives generally have 3 times the overload ability, which can be used to overcome the inertial moment of the inertial load at the moment of start-up, while the frequency converter generally allows 1.5 times the overload.
Handling precision
Servo control ...
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Calculation of the braking resistance of the inverter – Reynolds
After selecting the resistance value of the braking resistor, the power value of the braking resistor should be confirmed, and the selection of the braking resistor power is relatively cumbersome, and it is related to many factors.
The instantaneous power consumed by the braking resistor is calculated according to the following formula: P instantaneous = ...
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Methods and steps of frequency conversion speed regulation - Reynolds
Frequency conversion speed regulation is to change the power supply frequency through the frequency converter, and then adjust the motor speed to improve the operation efficiency of the electric drive system. Depending on the current, VFDs can be divided into AC-DC-AC type and AC-AC type. At present, the most widely used in China is the AC-DC-AC type.
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Reynolds soft starter fault code and fault handling
Reynolds soft starter fault code
Instantaneous stop -F 01 Instantaneous stop terminal 7 to terminal 10 open
TOO LONG STARTING TIME -F 02 STARTING TIME IS TOO LOW AND THE STARTING TIME IS TOO LONG (GREATER THAN 60S)
Overheating -F 03 Start too often, reduce the number of starts
Input out of phase -F 04 ...
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Small fan inverter choice - Reynolds
Now many electrical appliances are advocating the use of small parts, because small parts will not occupy space, and small parts can be moved and overhauled at any time, and the inverter also has a small inverter, how to buy a small fan inverter?
Power picking
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How to determine the frequency of start-up – Reynolds
Generally, most motors start to speed up from 0Hz, but in some special cases, it is necessary to start directly from a certain frequency. At this time, the frequency output of the VFD at the moment of activation is the activation frequency. In general, you need to set the activation frequency in the following situations.
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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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Introduction to the appearance of Reynolds inverter
Bypass cabinet: The cabinet is equipped with high-voltage inlet and outlet isolation switches QS1 and QS2, as shown in Figure 2. Among them, QS1 is a single-pole single-throw variable frequency incoming knife switch, and QS2 is a single-pole double-throw power frequency and variable frequency outgoing knife switch. The bypass cabinet is a high-voltage environment, please observe the live display and electromagnetic lock status to ensure that the ...
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Reynolds drives use the most energy-efficient method
As an electronic electric, the inverter itself also consumes electricity (about 3-5% of the additional power). A 1.5 hp air conditioner consumes 20-30W of electricity, which is equivalent to the length of a lamp. The inverter works under the power frequency and has the function of saving electricity, which is practical.
But the conditions are:
At the top of the list, great success ...
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Safety standards for AC drives – Reynolds
International electrical safety standards: The requirements are in line with international electrical safety standards, such as CE standards in Europe and UL specifications in United States. These specifications specify the requirements for electrical safety functions, mechanical safety functions, EMC functions, etc.
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DCS and PLC and other control cabinets are inspected before leaving the factory
1. Test preparation:
1. It is necessary to remove all power switches before powering on the PLC control cabinet or IO cabinet.
2. It is necessary to completely cut off the connection between the PLC or DCS card and the outside. All front adapters are to be loosened and raised.
3. Check the power terminal wires and connectors.
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Inverter breakdown factor – Reynolds
1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage composed of various reasons exceeds the additional voltage, which is reflected in the DC voltage of the inverter DC bus.
Overvoltage alarm generally appears when the machine is shut down, and its main ...
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Common faults and solutions of vector inverter - Reynolds
The following faults may be encountered during the use of the inverter, please refer to the following methods for simple fault analysis:
1. No manifestation at power-on:
1) Use a multimeter to check whether the input power supply of the inverter is consistent with the rated voltage of the inverter, and check the cleaning problem.
2） ...
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Misunderstanding of inverter control loop wiring - Reynolds
1. The wires of the inverter control circuit should be strictly distinguished from the main circuit cable (power line) and placed separately. This effectively prevents the inverter's control circuit from being disturbed by harmonics in the inverter's main circuit.
2. To separate the connection of the inverter from the terminals or contacts of other control circuits, ...
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