It is selected according to the type of load current in the circuit. AC contactor should be used for AC load, DC contactor should be selected for DC load, assuming that the control system is mainly AC load, DC motor or DC load capacity is small, AC contactor can also be used to control, but the additional current of the contact should be selected larger.
1. Select the type of contactor
It is selected according to the type of load current in the circuit. AC contactor should be used for AC load, DC contactor should be selected for DC load, assuming that the control system is mainly AC load, DC motor or DC load capacity is small, AC contactor can also be used to control, but the additional current of the contact should be selected larger.
2. Select the additional voltage of the main contact of the contactor
Secondly, the additional voltage of the main contact of the contactor should be equal to or greater than the additional voltage of the load.
3. Select the additional current of the main contact of the contactor
The additional current of the main contact of the selected contactor should not be less than the additional current of the load circuit. It can also be selected according to the maximum power of the motor to be operated. Assuming that the contactor is used to control the repeated initiation, positive and negative braking of the motor, the additional current of the main contact of the contactor should be reduced, which can generally be reduced by one level.
4. Confirm the operating voltage of the lead coil and the capacity of the auxiliary contact according to the requirements of the control circuit
Assuming that the control circuit is relatively simple and the number of contactors used is small, the additional voltage of the AC contactor coil is generally directly selected as 380V or 220V. Assuming that the control circuit is more complex and the electrical appliances are more, for the sake of safety, the additional voltage of the coil can be selected to be lower, and a control transformer is required. The additional voltage of the DC contactor coil should depend on the condition of the control loop. A series of contactors of the same capacity level have several additional voltages of the coil, and the additional voltage of the coil can be selected to be consistent with the voltage of the DC control circuit. The coil of the DC contactor is added to the DC voltage, and the coil of the AC contactor is generally added to the AC voltage. Sometimes, in order to improve the maximum operating frequency of the contactor, the AC contactor also uses a DC coil. Assuming that the coil with DC voltage is added with AC voltage, the contactor often does not engage because the barrier is too large and the current is too small. Assuming that the coil with AC voltage is added with DC voltage, the coil will be burned out because the resistance is too small and the current is too large.
|
More on that
|
Delixi inverter harmonic control method principle analysis
1. Install AC reactor and DC reactor. When the inverter is used in the distribution transformer capacity is greater than 500kva, and the transformer capacity is greater than 10 times of the inverter capacity, an AC reactor is installed on the input side of the inverter. And when the output voltage of the distribution transformer is unbalanced and uneven in three phases ...
|
|
Working principle and function of thermal relay
Thermal relay is a maintenance appliance used for overload maintenance of electric motors or other electrical equipment and electrical lines.
In the actual operation of the motor, if the machine is in abnormal condition or the circuit is abnormal, the motor will be overloaded, the motor ...
|
|
Delixi Electric universal switching power supply
Delixi general switching power supply can provide stable DC output products, widely used in communications, LED displays, industrial control, radio and television, computer networks, medical equipment, intelligent monitoring and other fields.
Delixi universal switching power supply SA, DA, TA, QA Type 85 - 132 / ...
|
|
Delixi time control switch adjustment
First, press the "Cancel Recovery Button" 4 times in a row;
Then adjust the clock (the factory has been adjusted), if you need to adjust it again, press and hold the "clock key" together, and then press the "school week, time key, school minute key" to adjust the Beijing time. ...
|
|
Delixi time control switch KGL1 latitude and longitude technical parameters
Delixi Electric KGL1 latitude and longitude time control switch is suitable for communication 50Hz operating voltage 380V and the following control circuits, Delixi time control switch, according to the local latitude and longitude, according to the season to change the automatic adjustment control time, as the timing of the implementation of components. Plugging in or out of all sorts of ...
|
|
Delixi E series inverter common fault analysis
Fault phenomenon, fault description, detailed description of troubleshooting measures
No display at power-on, no display, no display
Check whether the power wiring is correct; Check whether the 5V power supply is normal;
Check whether the keyboard is in good contact with the control board; Check whether the control panel and keyboard are normal.
If you use ...
|
|
Delixi surge protector SPD technology is used
Since its creation in the 1970s, which began as a patent for Zap Trap under the pleasant name, surge maintenance equipment (SPD) has become essential in many lightning protection systems (LPS).
Surge maintainers are now used in electrical installations to avoid transient overpower ...
|
|
Delixi E180 universal inverter introduction
Product Introduction
With optimized open-loop vector control, V/F control, closed-loop vector control, stable function, function optimization, it is a high-function vector inverter, which can be widely used in speed control accuracy, torque echoing speed...
|
|
Delixi CDM molded case circuit breaker upgrade
The 6 series electronic molded case circuit breaker CDM6Ei was launched in 2017 with the addition of a 1600A shell frame; High through-off capacity, *** high Ics=65kA, to meet specific application occasions; Long-distance four-remote communication to complete intelligent connectivity; Support mobile APP communication and alarm non-tripping function; The maximum operating temperature of the product can be ...
|
|
The main components of Delixi inverter are composed
1) Rectifier
The rectifier circuit of the universal inverter consists of a three-phase bridge rectifier bridge. Its function is to rectify the power frequency power supply and supply DC power to the inverter circuit and control circuit. Three-phase AC power supplies are generally required to be introduced into the input of the rectifier bridge through the absorption capacitor and varistor network.
|
|
Precautions for the use of Delixi stabilized power supply
1. The use environment of regulated power supply requires good ventilation, no moisture, no corrosive gas, explosive substances, conductive dust Egypt steam, etc., and it is required to be installed in places without intense oscillation.
2. The voltage regulator is used according to the function of the electrical equipment.
|
|
Causes the inverter breakdown factor - Delixi
1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the inverter voltage formed due to various reasons that exceeds the rated voltage, which is reflected in the DC voltage of the inverter DC bus.
The overvoltage alarm generally appears at the time of shutdown, and its main ...
|
|
Delixi general inverter E100 series products introduction
E100 series products are a standard inverter with optimized open-loop vector control, V/F control, stable performance, rich functions, optimized structural design, exquisite appearance, and high cost performance.
Technical features:
...
|
|
Delixi solid state relay over AC contactor advantages
Delixi solid state relay and Delixi communication touch device are more used products, so what are the advantages of solid state relay compared to communication touch device, how should we choose when we can choose?
1. First of all, solid...
|
|
Delixi inverter start, stop how to wiring
The control of the inverter is nothing more than the basic logic of starting, aborting, forward rotation, rotation, and speed regulation, which basically requires that the level condition is useful, not the rising margin is useful, so the use of button switches to control the inverter is generally required to use the button in the form of self-protection ...
|
|
Delixi inverter CDI-E180 series of introduction
Product Introduction
With optimized open-loop vector control, V/F control, closed-loop vector control, stable function, rich functions, it is a high-performance vector inverter, which can be widely used in speed control accuracy, torque echoing speed, ...
|
|
Is a circuit breaker an air switch? - Delixi
1. Circuit breaker refers to a switchgear that can turn on, carry and turn off the current under normal circuit conditions and turn on, carry and turn off the current under abnormal circuit conditions within a regular time.
According to the voltage of Delixi circuit breaker, there are high-voltage circuit breakers and low-voltage circuit breakers. Below 1kV ...
|
|
The structure of the inverter - Delixi
The main circuit is the power conversion part that supplies the voltage regulation and frequency modulation power supply to the asynchronous motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into a communication inverter, and the filter of the DC loop is the capacitor. The current type is to convert the DC of the current source into a communication ...
|
|
Inverter application skills - Delixi
1. Shielded wires should be used for signal lines and control lines, which is beneficial to avoid disturbance. When the line is long, for example the distance jumps 100m, the conductor cross-section should be enlarged. The signal line and the control line should not be placed in the same cable trench or tray with the power line, so as not to disturb each other, it is best to place it through the pipe, ...
|
|
Delixi parameter voltage regulator performance and advantages
1. Its overall inductive skills function is the best, its design does not use electronic equipment, and the environmental adaptability and stability and reliability function are the highest. When the capacity of most power grids is sufficient, the voltage is relatively stable, but with the improvement of electrification and informatization, the pollution of some power grids, ...
|
|
Contact
working hours
