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.
Communication contactors are different from DC contactors, and are only suitable for DC-1 to DC-5 loads when used for DC loads, and DC contactors are recommended for DC loads above DC-5. Other capacitive contactors cannot be replaced by general communication contactors.
2. Confirm the load type and main circuit parameters
The main circuit parameters are mainly additional operating voltage, additional current, number of poles, on-off capacity, insulation voltage and overload capacity. Pay particular attention to the type of load. The contactor can be operated under different load types, but the corresponding types are different, and it cannot completely rely on the main voltage and power selection.
Distribution loads (resistive loads) are selected according to AC-1; The general motor load is selected according to AC-3; The winding motor is selected according to AC-2; Regarding the frequent start-stop load, it should be selected according to the AC-4 load, because the contact fusion welding phenomenon will occur when the load is frequently turned on and off, such as the industry with frequent forward rotation, driving, and frequent jogging.
In addition, for the 4-pole contactor, there are two series of main pole 2NO+2NC, or 4NO, which cannot be replaced by the general 3-pole contactor and auxiliary contact.
3. Control circuit and auxiliary contacts
The coil voltage of the contactor is confirmed according to the voltage of the control loop. At present, the domestic D2 series contactors only have communication coils. If you need DC coils, you need to choose imported TeSys D, TeSys F products.
In addition, there are also low-power imported TeSys D and TeSys K products for DC coil contactors, please pay attention to the selection.
Regarding the auxiliary contacts, the position and number of auxiliary contacts allowed by different contactors are different, and the requirements are checked in the table.
4. Electrical life and mechanical life
In the design process, if there is a strict requirement for the electrical life of more than one million times, please check the table according to the life curve on the sample.
|
More on that
|
The object of protection of frequency converters in overload protection - Reynolds
Inverters are mainly divided into two categories according to the frequency conversion method: communication/DC/communication and communication/communication inverters. Here we take the widely used general "communication/DC/communication" as an example to briefly talk about its structure and operating principle. As can be clearly seen from the above diagram, the communication/...
|
|
Inverter maintenance and undervoltage fault handling - Reynolds
In the repair of the inverter, we often hear about overpressure problems, but underpressure problems are also common problems encountered in the use of inverters. The reason is that the main circuit voltage is lower than the lower limit caused by the maintenance action or the damage of a rectifier bridge or the instantaneous power failure of the power grid, and the input is flat. Inverter after-sales ...
|
|
The inverter has no short-circuit protection for the reason – Reynolds
Short-circuit maintenance is a function of equipment connected between the power supply and the load, which can effectively disconnect the short-circuit point from the power supply when the load side is short-circuited. If an equipment has a short-circuit maintenance function, it must have a certain short-circuit breaking ability; And a device with the ability to break in a short circuit ...
|
|
Faulty inverter – Reynolds inverter
In ancient times, there were ten major tortures, which made people unable to survive and die, and experienced the purgatory of the world; Today, there are ten "tortures" of inverters, and the same can make your inverters suffer. Let's follow the editor to find out which of the top ten "tortures" will make your inverter "worse than dead"!
...
|
|
Inverter selection conditions and precautions - Reynolds
1. When selecting the inverter, select the inverter with the appropriate control method according to the load characteristics
In addition to the inverter manufacturing process, it is also important to choose which control method of the inverter. The control method of the inverter is mainly divided into two types: open-loop control and closed-loop control. In the meantime, the open-loop control method ...
|
|
The main circuit of the inverter is composed of Reynolds
When it comes to inverter repair, it's not enough to understand the above fundamental circuits, but also to understand the following primary circuits. The main circuit is mainly composed of rectifier circuit, current limiting circuit, filter circuit, braking circuit, inverter circuit and detection and sampling circuit.
...
|
|
Application misunderstandings and drawbacks of inverter and countermeasures - Reynolds
Misunderstanding: connect electromagnetic switches and electromagnetic contactors in the output circuit of the inverter
In actual use, some occasions require the use of contactors for frequency converter switching: such as when the frequency conversion is faulty, switch to the power frequency operation, or when the one-to-two method is adopted, a motor is faulty, and the variable frequency is used.
|
|
The reason why the inverter controls the motor – Reynolds
Q1: Why should I use VFD to control the motor?
When it comes to this issue, let's take a brief look at these two devices. The motor is an inductive load that hinders the change of current, and when it is started, a large change in current is generated. VFD, which is actually made up of a rectifier inverter circuit, ...
|
|
Frequency converters need to be replaced regularly – Reynolds
The inverter is composed of many electronic parts, such as semiconductor components, etc., in the application and protection involves the replacement of a related component, because of the composition or physical characteristics of the inverter, it will deteriorate in a certain period of time, which will reduce the characteristics of the inverter, and even ...
|
|
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 ...
|
|
Control method of Reynolds inverter
The fulfillment device commonly used in the industrial field of Reynolds inverter has good speed regulation performance and simple and convenient operation method. Therefore, it is widely used in the automation system.
Typical wiring method for the main circuit of a Reynolds frequency converter
...
|
|
There will be problems with the inverter left for a long time - Reynolds
Most inverter brand products can rely on the heat generation of internal electrical components to remove moisture during normal use. If you don't have to do it for a long time, it's easy to get wet. The chip pins, penetrating resistors, capacitors, and inductor pins of the DIP package will be severely rusted or desoldered, resulting in on-resistance ...
|
|
How to measure a frequency converter with a multimeter – Reynolds
How to use a multimeter to measure the quality of the inverter, it needs to be noted that for personal safety, it is necessary to ensure that the machine is powered off, and remove the inverter input power line R, S, T and output line U, V, W before operation! First of all, the multimeter is hit to the "secondary pipe" file, and then through the multimeter ...
|
|
The relationship between Reynolds motion control and frequency converters
Motion control has obvious period characteristics, it is a variety of high-tech generalization, used to push industrial automation, office automation and home automation to a higher stage. Nowadays, motion control is mainly composed of variable frequency drive (VFD), electric motor, control ...
|
|
Precautions for the coordination of PLC and inverter - Reynolds
Under the current production conditions, when the inverter is used to form an automatic control system for control, in many cases, it is necessary to choose PLC and inverter to match the use, such as bearing cleaning, packaging paper printing, PCB board production, etc.
PLC ...
|
|
What inverter to choose what occasion - Reynolds
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct selection of the type of inverter.
When selecting the inverter, the current value of the actual motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a ...
|
|
The working principle of the motor soft starter – Reynolds
Motor soft starter is the primary selection of power electronics skills and microprocessing skills and modern control theory and design and production of advanced level of new engine equipment, motor soft starter mainly has anti-interference function, high reliability, multiple protection functions and other characteristics, according to these characteristics of electric ...
|
|
Precautions for installation of Reynolds low-voltage inverters
1. Safety precautions
1. The primary requirement is to have certain electrical professional knowledge, and understand the job site, understand the equipment status, and have certain electrical operation technology.
2. Determine the electrical ...
|
|
Problems between the inverter and the motor – Reynolds
1. The power and temperature rise of the motor
Regardless of the method of the inverter, different degrees of harmonic voltage and current occur during operation, so that the motor runs under non-sinusoidal voltage and current. Rejection of material introduction, taking the sine wave PWM type inverter that is now widely used as an example, ...
|
|
Water pump inverter pressure adjustment method - Reynolds
Water pump inverter pressure conditioning steps: 1. Open PID closed-loop control; 2. Close the pressure circuit; 3. Set the pressure feedback and set the given pressure; When the pump speed is changed, the outlet pressure can be changed. Adjust the operating frequency of the VFD. The higher the frequency, the higher the pump speed and the higher the pressure. About ...
|
|
Contact
working hours
