Starting performance is a very important performance parameter of motor products. The large starting current of the motor is an unpreventable problem in the process of direct starting. The high current during the engine process has a great impact on both the power grid and the motor itself. Therefore, according to different working conditions and different series of motors, soft start is selected to start the motor.
Soft starter is a motor control device that integrates soft start, soft stop, light load energy saving and a variety of maintenance functions. There are two main indicators of the starting performance of asynchronous motors, starting current multiple and starting torque multiple. The soft engine reduces the starting current and torque by changing the power supply voltage applied to the motor during the start-up process. The current-limiting feature of soft engine can effectively restrain the inrush current, prevent unnecessary shock torque and current impact on the distribution network, and effectively reduce the false triggering action of circuit breakers and contactors. Regarding the motor with frequent start and stop, it can effectively control the temperature rise of the motor, which greatly extends the life of the motor. At present, the soft starters widely used in engineering include liquid resistance soft start, solid-state soft start, magnetron soft start, high-voltage frequency conversion soft start, etc.
Soft start of wound motors
In the case of wire-wound motors, a special electrolyte is inserted into the rotor circuit of the wire-wound motor as a resistor. After adjusting the concentration of the electrolyte and changing the spacing between the two plates, the resistance value of the series resistance has been meeting the requirements of the mechanical characteristics of the motor for the series resistance value during the starting process, so that the motor can uniformly progress the speed with the maximum starting torque and the minimum starting current, and start smoothly. After starting, the rotor circuit is short-circuited, and the motor is started.
Soft start of cage motors
Water resistance cabinet soft start
When the motor is started, the squirrel cage motor can be started smoothly and without impact by controlling the resistance value of the liquid and the starting time.
Solid-state soft-start
This type of engine can reduce the starting impulse current of the motor, reducing the impact on the power grid and the motor itself. Together, the mechanical impact of the mechanical load device on the motor is reduced, thereby extending the service life of the equipment and reducing breakdowns and downtime.
Magnetron soft start
It can make the inductance actively change from large to small in the predetermined time, and complete the soft start of the motor.
Inverter soft start
The inverter can be controlled by frequency conversion, which can complete the smooth start and speed change of the motor, with a wide range of speed regulation and high efficiency, and complete the soft start, overcurrent, overvoltage and overload maintenance functions of the communication asynchronous motor. Frequency conversion speed regulation technology provides an important solution for improving product quality and output value, saving energy and reducing consumption, improving labor conditions, and improving economic benefits.
|
More on that
|
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 ...
|
|
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.
|
|
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 ...
|
|
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"!
...
|
|
Reynolds inverter parameter settings
The use of Reynolds inverters in industrial production is very important, in addition to speed regulation, soft start effect, the important thing is to be able to save energy. There are many functional parameters of Reynolds inverter, and there are generally dozens or even hundreds of parameters for users to choose. In practice, it is not necessary to ...
|
|
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.
...
|
|
The external configuration of the inverter is solved - Reynolds
With the improvement of the degree of automation of packaging machinery, packaging machine inverter (hereinafter referred to as VFD) plays an increasingly important role in packaging machinery. Capsule filling machine, high-speed tablet press, bottling production line, aluminum-plastic packaging machine, cartoning machine, each equipment will use VFD, mainly ...
|
|
The inverter cannot adjust the frequency solution - Reynolds
In the course of inverter repairs, if there is no significant damage to the hardware and the maximum torque of the VFD is usually less than the torque of the load increase. It means that the load capacity of the frequency conversion speed control equipment has decreased significantly. So how do you deal with this?
...
|
|
Features of Reynolds high-voltage frequency converters
RNVH-A series high-voltage inverter adopts multi-unit series multi-level technology, which is attributed to high-high voltage source inverter, which can directly input 6KV/10KV and direct 6KV/10KV output. Taking the 6KV series as an example, each phase is connected in series by 5 power units, and each power unit is isolated by the input transformer.
|
|
Overheating failure light on start-up analysis - Reynolds
(1) Frequent starting, resulting in excessive temperature, causing overheating maintenance of soft starter. (The number of starts of the soft starter should be controlled to no more than 6 times per hour, especially for heavy loads)
(2) During starting, ...
|
|
Fault analysis of short circuit of inverter motor – Reynolds
According to the different degrees of short circuit, the inverter can display the short circuit of the SCF1 motor; SCF2 has an impedance short circuit; SCF3 is short-circuited to ground.
Causes of the problem: insulation problems with the cable from the motor or inverter to the motor; current transformer fault; ...
|
|
The difference between frequency converter and power saver - Reynolds
Many people don't have a clear idea of the detailed differences and uses of AC converters and power savers. Power savers are generally divided into lighting appliances and power savers. Using high-voltage filtering and energy absorption skills, it automatically absorbs the energy of the reverse potential of high-voltage power equipment, and continuously feeds back ...
|
|
Inverter: The right inverter to use - Reynolds
Low pressure issues
The VFD reports a low voltage issue when the drive's DC link voltage drops below 62% of the nominal level at the high setting (480 Vac) and 50% of the nominal value at the low setting (400 Vac).
The +10% and -15% voltage tolerances in most manuals are the ones that claim to be ...
|
|
The cause of overheating of servo motor bearings - Reynolds
The motor itself:
1) The inner and outer rings of the bearing are too tightly cooperated.
2) There are problems with the shape and position tolerance of parts, such as the coaxiality of parts such as machine base, end cover, shaft and other parts is not good.
3) Improper selection of bearings.
4) The bearing is not smooth or the bearing is not clean, and there are impurities in the smooth grease. ...
|
|
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.
|
|
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.
...
|
|
Use the right power for the inverter – Reynolds
Low pressure issues
The VFD reports a low voltage glitch when the drive's DC link voltage drops below 62% of the nominal level at the high setting (480 Vac) and 50% of the nominal value at the low setting (400 Vac).
The +10% and -15% voltage tolerances in most manuals are the ones that claim to be ...
|
|
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 ...
|
|
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 ...
|
|
Reynolds inverter parameter problem
1. What are the factory recovery parameters of Reynolds inverter?
N600 = 100 (often press the WR button for 3-5 seconds), it is necessary to be in the shutdown state to be effective.
2. In the parameters of the N308 motor of the inverter, is the [motor leakage inductance reactance] specified sub-leakage inductance or rotor leakage inductance react?
Decide...
|
|
Contact
working hours
