1. Single-phase circuit single-phase power supply - power supply with a single AC electromotive force. The fundamental power supply method for civil electricity. Single-phase load – A load that is powered by a single-phase power supply. Household appliances such as lights, televisions, and electric fans are generally single-phase loads. The accounting method is as follows:
a. When the maximum stand-alone capacity of the load does not exceed 25% of the capacity of the voltage regulator, the voltage regulator capacity is directly selected according to the load accounting capacity (or the capacity converted according to the actual current value).
When the load power is KVA, it can be simply added; When the load power is KW, it is first added and divided by the power factor (generally 0.75), and when the load power is the load current (A), it is first added and divided by 4 to be the capacity.
(Note: Practice advocates the selection of 80% load factor (safety factor))
b. When the maximum stand-alone capacity of the load exceeds 25% of the voltage regulator capacity, the voltage regulator capacity is selected according to the calculated capacity of the load (or the converted capacity of the actual current value) (the same proposition is selected according to the 80% load factor); It is also necessary to verify the impulse current bearing capacity of the voltage regulator according to the accounting current plus the maximum single load starting current (the instantaneous impulse current bearing capacity of the compensating voltage regulator and thyristor regulator is generally calculated according to ≤ 2-2.5Ie).
For example, a simple estimate of the capacity of a voltage regulator for air conditioners:
General air conditioner: about 3 according to the power of the air conditioner*
Inverter air conditioner: according to the power of the air conditioner*2 or more
2. Three-phase circuit three-phase power supply - a commonly used multi-phase alternating current system, the fundamental method of modern power generation, transmission and power supply. (The common wiring method is Y-shaped (star-shaped) with three symmetrical electromotive forces, the frequency and amplitude of each electromotive force are equal, and the phase difference between the two adjacent phases is equal to 120 degrees) Three-phase load - a load powered by a three-phase power supply. Elevators, machine tools, high-power air conditioners and other large-scale electrical equipment are generally three-phase loads. Y-shaped (star-shaped) connection of the power supply - the ends of the three coils of the three-phase generator are connected together, and the three heads are used to supply power to the load. (A, B, and C indicate the first end of the three-phase power supply, respectively, and the end connection point O of the three coils indicates the midpoint of the three-phase power supply.) The connection line between the power supply and the head of the load is called the phase line, also called the front; The connecting line between the midpoint of the power supply and the midpoint of the load is called the neutral line, also known as the neutral line or neutral line. The voltage between the phase wire and the neutral wire is called the phase voltage; The voltage between the phase wire and the phase wire is called the line voltage. The current flowing through each phase coil of the generator is called the phase current; The current flowing through each phase of the power supply is called the line current. In a Y-shaped (star-shaped) power supply system, the line current is equal to the phase current, and the line voltage is equal to the phase voltage √ 3 times. The current flowing through the neutral wire is called the midline current, which is indicated by Io. When the three-phase load is balanced, the midline current is zero.
The accounting method is as follows:
a. When the maximum single-unit capacity of the load does not exceed 25% of the capacity of the voltage regulator, the capacity of the three-phase voltage regulator is directly selected according to the load accounting capacity (or the capacity converted by the actual current value). When the load power is KVA, it can be simply added; When the load power is KW, add it first and divide it by the power factor (generally choose 0.75); when the load power is the load current (A) of each phase, add it first and divide it by 1.6 as the capacity; (Note: In practice, it is recommended to choose according to the 80% load factor (safety factor))
b. When the maximum stand-alone capacity of the load exceeds 25% of the voltage regulator capacity, the voltage regulator capacity is selected according to the calculated capacity of the load (or the converted capacity of the actual current value) (the same proposition is selected according to the 80% load factor); It is also necessary to verify the impulse current bearing capacity of the voltage regulator according to the accounting current plus the maximum single load starting current (the instantaneous impulse current bearing capacity of the compensating voltage regulator and thyristor regulator is generally calculated according to ≤ 2-2.5Ie).
Pay attention:
Frequent direct start (such as ordinary elevators...) ), frequent impact loads (spot welding, laser...) Wait:
The load accounting capacity is calculated by 2-2.5 times the additional capacity.
|
More on that
|
Switching power supply FAQ - Delixi
1. The safety wire is blown off
In a general environment, a blown safety wire indicates that there is a problem with the internal wiring of the power supply. Because the power supply is operated in the shape of high voltage and high current, the fluctuation of the grid voltage and the surge city cause the current in the power supply to increase suddenly and cause the safety wire to be blown off. The focus should be on checking the power ...
|
|
Noise characteristics of different switching regulator topologies - Delixi
Currently, there are many different switching regulator topologies. Some topologies are widely used, such as the classic buck converter, also known as the buck converter. However, there are also some lesser-known switch-mode DC-DC converters that include Zeta topologies. These topologies are divided into fundamental topologies ...
|
|
Delixi spare parts replacement cycle
1. Cooling fan (2-3 years)
As long as the inverter is in use, the cooling fan has always been running, so the cooling fan is generally a short-service life accessory, generally after the use of the cooling fan for 2-3 years, the bearings, balls, motors, etc. of the fan are seriously worn, and they need to be replaced.
|
|
The inverter is changed to a servo to consider the key points
There are substantial differences between servos and inverters in terms of application intention and function. Which one to choose depends on factors such as operating mode, load conditions, price, etc. Basically, the performance of the servo is superior to that of the inverter. Therefore, when changing from an inverter to a servo, there are generally no operational problems ...
|
|
Delixi relay maintenance method
Relay is a kind of electrical appliance that turns on or off the control circuit according to the change of external input signals, such as electrical quantity (voltage, current) or non-electrical quantity (heat, time, speed, etc.), in order to complete the control or maintenance mission.
|
|
The reason for the failure of the inverter - Delixi
1. Ability to adapt to the environment
When the motor on the bus starts in a group, when the bus is the largest motor unit starts, the impact on the operation of the inverter, which is related to the input voltage fluctuation scale parameters promised by the inverter, for thermal power units should ensure that the bus voltage drops by 30% when the frequency conversion ...
|
|
Resistance quantization circuit exerts resistance to the flow of current – Delixi
We are able to compare the values of resistance and hose diameter (conductance vs. practical diameter). When it comes to metal wires, this analogy works well. Small-diameter wires have a higher resistance than large-diameter wires made of the same metal.
The standard unit of resistance is ohms, there are ...
|
|
The main functions of Delixi regulated power supply
The primary effect of Delixi voltage regulator is, of course, to stabilize the voltage. When the grid voltage fluctuates instantaneously, the regulated power supply will compensate for the voltage amplitude with a response speed of 10-30ms
1. Stable voltage:
Wangwen Shengyi, Delixi stabilizes ...
|
|
Delixi three-phase motor electrical control circuit principle
What is the principle of the electrical control circuit of the three-phase motor? First of all, let's take a look at what is the principle of electrical control of work machinery. The schematic diagram of the electrical control circuit of the working machinery is actually connected with graphic symbols, text symbols and lines to show the connection relationship and circuit of each electrical component.
|
|
Judgment and treatment of inverter short-circuit fault characteristics - Delixi
(1) Fault characteristics
a) The first trip may occur during operation, but if it is restarted after resetting, it will often trip as soon as the speed is raised.
b) have a large inrush current, but most drives are now able to perform maintenance trips without damage. Due to the ...
|
|
How to solve the data running flight of Delixi inverter controller
Problem depiction:
Delixi inverter controller data flying, or the data is occasionally incorrect, how to solve?
Solution(s):
This is the result of severe disturbances to the controller. Frequently...
|
|
Linear and switching regulator features
The advantages of linear DC regulator are high stability, small ripple, high reliability, and easy to make a multi-output connected adjustable power supply. The disadvantages are large size, bulkiness, and relatively low power.
There are many kinds of this kind of regulated power supply, which can be divided into regulated power supply, stabilized current power supply and ...
|
|
Delixi inverter E180 series technical features
1. Superior performance
The new vector control algorithm is adopted, and the starting cabinet is large, the torque response is fast, and the control accuracy is high, which further improves the operation efficiency of the motor.
2. Powerful function and low cost of use
Built-in large number of ...
|
|
Voltage regulator power selection and determination - Delixi
1. The output power of the voltage regulator is the maximum power
Basically, most of the nominal power of household appliances refers to active power, and the so-called refrigerators, air conditioners and those water pumps used in the home, etc., most of them are also inductive loads that start instantaneous currents.
|
|
Delixi voltage regulator fault phenomenon
Delixi regulator output voltmeter keeps swinging back and forth, and sparks occur at the carbon brush, and the problem phenomenon and cause analysis
1. The contact pressure between the carbon brush and the coil plane is too small
2. The carbon brush is severely worn
Delixi voltage regulator has ...
|
|
Delixi selects the rated parameters of the contactor
According to the controlled target and operating parameters such as voltage, current, power, frequency and operating system, the additional parameters of the contactor are determined.
1) The coil voltage of the contactor should generally be lower, so that the insulation requirements of the contactor can be reduced, and it is safer to use. But for the sake of the party ...
|
|
General parameter setting skills of inverter - Delixi inverter
1. Upper frequency (high speed) SEt - HSP and lower limit frequency (low speed) SEt - LSP
The upper frequency is the frequency corresponding to the *** large given, and the lower frequency is the frequency corresponding to the *** small given. The upper and lower limit frequencies are set to limit the speed of the motor, so as to satisfy the design.
|
|
Delixi voltage regulator power selection
1. The output power of Delixi voltage regulator is the maximum power
Basically, most of the nominal power of household appliances refers to active power, and the so-called refrigerators, air conditioners and those water pumps used in the home, etc., most of them are also rational loads that start instantaneous currents.
|
|
Daily maintenance of reducer - Delixi
The reducer is a kind of transmission equipment used for low speed and high torque, which uses the speed converter of the gear to reduce the number of revolutions of the motor (motor) to the required number of revolutions, and obtains a large torque organization. Its main function is to reduce the speed and improve the output torque at the same time, and the torque output share is according to the motor ...
|
|
Reduce the maintenance cost of the inverter - Delixi
Frequency converter is a widely used equipment in modern factories. This is a very expensive new type of equipment, and the maintenance price of the inverter is also very expensive, so in the process of using the inverter, we should pay attention to the use of the inverter.
Thing...
|
|
Contact
working hours
