Calculation of the braking resistance of the inverter – Reynolds

The top failure modes of mechanical parts: Failure: The mechanical part cannot complete its normal function within the planning and booking period and under the regular conditions. Ways in which mechanical parts fail: overall cracking, plastic deformation, corrosion, abrasion, gluing, and touch exhaustion General ...

The output voltage of low-voltage general frequency conversion is 380-650V, the output power is 0.75-400kW, and the operating frequency is 0-400Hz. Its control methods have gone through the following four generations. 1U/f=C Sinusoidal Pulse Width Modulation (SPWM) Manipulation MethodIts Characteristics ...

(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, ...

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. ...

First, select from the inverter "software". The reason why the factory chooses the inverter to work together with the fan is that it is hoped that the automation and intelligent design of the inverter technology can improve the speed regulation mode of the fan, and reduce the wasted energy consumption, which not only improves the wind efficiency.

Reynolds JJR5000 series all-digital intelligent AC motor soft starter adopts power electronics technology, microprocessor technology and modern control theory technology, and is a new type of starting equipment at the international advanced level. This product can effectively limit the starting current of asynchronous motor start-up, and is widely used in ...

Bypass cabinet: The cabinet is equipped with high-voltage inlet and outlet isolation switches QS1 and QS2. 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 investigate the status of the live display and electromagnetic lock to ensure safety before ...

1. It is necessary to consider the touch and current size of the incoming terminal, if the terminal standard is small, perhaps the conductive function of the terminal is poor, which will directly cause the current carrying capacity of the terminal to be small and heated. 2. The inlet at the end of the inlet line must be pressed well and the like, if it is not pressed, it may cause ...

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 ...

From September 23rd to September 25th, 2020, the 2020 China International Paper Technology Exhibition was held in Hall D1 of Suzhou International Expo Center.

General treatment methods for inverter overcurrent problems: The output side of the inverter is a PWM voltage waveform, and after passing through the motor winding, the output current is approximately a sine wave, and lags behind the voltage by a phase viewpoint, which is determined by the power factor of the motor. The output current of the inverter passes through ...

1. See if it is energy-saving. When selecting equipment products, many business managers will take into account the energy-saving embodiment, which is due to the excellent energy-saving embodiment of the product, which can save a lot of money and resources.

The first step is to check whether the appearance of the inverter is defective, including whether the indicator light is in normal operation, whether the mission control function of the operation panel is complete, and carefully observe the appearance of the inverter under the operating condition, and do the corresponding recording operation; When repairing the inverter, check whether the voltage value and current value exceed the ...

1. In order to save power, the inverter is selected Many manufacturers and salesmen praise how high the power-saving rate of the inverter is, and the user also believes that it is true, and the inverter is selected at a high cost simply in order to save electricity, but the results are greatly disappointed. Whether the inverter can save power after using it is determined by the load driven by it.

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 output of the inverter is controlled by PWM (pulse width modulation, similar to high-speed switching), so a high frequency leakage current will occur, if you want to install a general leakage disconnect switch on the primary side of the inverter, it is recommended to select a sensitivity current of more than 200mA for each inverter and the action time is 0.1 seconds ...

Voltage level: The voltage level should match the voltage level of the power supply and motor to ensure electrical safety and normal operation of the equipment. Current level: The current level should match the rated current of the motor to ensure electrical safety and normal operation of the equipment. Cable Specification: Cable ...

I often see many beginners tossing on the resistor when overhauling the circuit, and it is dismantling and welding, in fact, it is repaired a lot, as long as you understand the damage characteristics of the resistor, you don't have to bother. Resistors are the most numerous in electrical equipment ...

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 ...

1. The starting time is different: light load generally refers to the small inertia of the equipment load, and the energy storage balance time of the demand for start-up is short, that is, the starting time is short. Heavy load generally refers to the long time of energy storage balance when the equipment load inertia is large and needs to be turned on, that is, the time of start-up. 2. The requirements for working current are not ...