Commonly used motor protection method - Hope Sunland

Limit switch is an electromechanical control element used to detect the direction of the movement of the machine or equipment, and send a signal when the specific position is in a specific direction to control the operation or stop of the equipment. It is often used in industrial production processes, such as CNC machine tools, conveyors, loading and unloading robots, etc. ...

1. How to distinguish between heavy faults and light faults According to the occurrence time of inverter faults, we can divide the types of faults into two categories: sudden faults and intermittent faults: (1) The sudden fault of inverter repair refers to the failure of the equipment when it is running, without warning.

1. Repair the damage of the inverter rectifier block The damage of the inverter rectifier bridge is also one of the common faults of the inverter, the inverter rectifier block in the early production is mainly diode rectifier, and now some rectifier blocks choose the rectifier mode of thyristor (voltage regulation and frequency modulation inverter). Middle...

The gantry milling machine is a machining equipment for processing larger workpieces, and its electrical control system includes two parts: the main transmission of the workbench and the logical control of the feed organization. Henan Jiaozuo Maike Company has a gantry milling machine, which has been used for many years since the 70s. The main drive of the operating table of the gantry milling machine is selected ...

There is a circuit breaker QF and a communication contactor KM between the power supply and the inverter, when the inverter does not need to be used for a long time. or when the equipment is overhauled, the circuit breaker is used as an isolation switch, which can block the power supply and ensure the safety of maintenance. It has maintenance functions such as overcurrent and undervoltage. The main power of the inverter ...

In recent years, with the development of power electronics skills, the frequency conversion speed regulation skills have been very mature, practice has proved that the use of frequency conversion speed regulation in fans, pumps and loads can save 20%-50% of the electric energy, and the use of frequency conversion speed regulation can bring the following advantages in the future, its biggest advantage is that it has ...

1. Cooling fan As a prerequisite for ensuring the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.

The main manifestations of the disturbance of the inverter in the application are: higher harmonics, noise and oscillation, load matching, heat generation and other problems. These disturbances are unavoidable, because the input part of the inverter is a rectifier circuit and the output part is an inverter circuit, both of which are made up of nonlinear components that play a switching effect.

1. Please explain the maintenance function of the inverter? (1) After detecting the abnormal situation, the correction action will be carried out automatically, such as overcurrent loss rate prevention, regeneration overvoltage stall prevention. (2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor can park automatically. As...

It is necessary to separate the signal line from the power line: when using analog signals for long-distance control of the inverter, in order to reduce the disturbance of the analog amount from the inverter and other equipment, please separate the signal line of the control inverter from the strong current circuit (main circuit and sequential control circuit). Inverter ...

1. What does open-loop mean in the use of inverters? The speed detector (PG) is installed on the motor equipment in operation, and the speed response of the actual speed is sent to the control equipment, which is called "closed loop", and the speed detector that does not use PG is called "open loop". Most general-purpose drives are open-loop ...

1. The motor slows down too slowly 1) If the deceleration time is set too long, reduce the deceleration time 2) Install a braking resistor 3) Add DC braking 2. The motor is overheated 1) The load is too large, and the practical moment has exceeded the ...

Inverters often encounter a variety of problems during commissioning and use, during which overvoltage is the most common. After the overvoltage occurs, in order to avoid damage to the internal circuit, the overvoltage protection function of the inverter will work, so that the inverter will operate intermittently, resulting in the equipment can not be ...

The selection of the inverter should be considered according to the type of controlled object, speed regulation scale, static speed accuracy, starting torque, etc., so that it can be easy to use and economical together with meeting the process and production requirements. According to the different forms of devices, it can be divided into four types, which can be divided into four types according to the controlled motor power and field device ...

The wearing parts of the driver mainly include electrolytic capacitors for filtering and cooling fans, and their service life is closely related to the environment and maintenance of the operation. Depending on the operating moment, the user can determine whether a wear part needs to be replaced. Cooling ...

A frequency converter (VFD) is an electrical energy control device that converts a power supply to another frequency by using the on-off effect of power semiconductor equipment. It can realize the soft start, frequency conversion speed regulation, improved operation accuracy, power factor, overcurrent/overvoltage/overload protection of AC asynchronous motor, etc.

Between the power supply and the inverter, there is a circuit breaker QF and a communication touch device KM, when the inverter does not have to for a long time. or when the equipment is overhauled, the circuit breaker is used as an isolation switch, which can block the power supply and ensure the safety of maintenance. At the same time, the circuit breaker has maintenance functions such as overcurrent and undervoltage. The main circuit of the inverter can ...

Frequency conversion speed regulation motor is generally selected 4-level motor, the fundamental frequency operation point is planned at 50Hz, the frequency 0-50Hz (speed 0-1480r/min) scale of the motor for constant torque work, the frequency of 50-100Hz (speed 1480-2800r/min) scale of the motor for constant power work, the whole speed regulation scale of (0 ...

The general voltage in industry is 0... 5(10)V or current 0(4)... 20mA is used as an analog signal transmission method, and it is also a method often used by program control machines. So what is the difference between the transmission method of voltage and current, and when to choose what method, the following will be briefly introduced.

(1). Constant torque load Different speeds, load resistance and torque base are stable. The output power is directly proportional to the rotational speed. Such as belt conveyors. (2). Constant power load Different speeds, stable load power base ...