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Frequency conversion control cabinet

Source: Changsha Zhongsheng Machinery Equipment Co., Ltd. Release time: 2015-1-21 Has been viewed 1917 times


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The frequency conversion control cabinet is mainly used to adjust the working frequency of the equipment, reduce energy loss, be able to start the equipment smoothly, and reduce the damage to the motor caused by the large current generated when the equipment is started directly. At the same time comes with analog input (for speed control or feedback signal), PID control, pump switching control (for constant pressure), communication functions, macro functions (different parameter settings for different occasions), multi-stage speed, etc. . It can be widely used in industrial and agricultural production and various types of buildings for automatic control of water supply, drainage, fire protection, sprinkler pipe network pressurization, and HVAC hot and cold water circulation.

The frequency conversion control cabinet is designed and manufactured by our technicians after fully absorbing the advanced experience of pump control at home and abroad, and constantly improving and optimizing.

Frequency conversion control cabinet products have overload, short circuit, phase loss protection, pump body water leakage, motor over temperature and leakage.

Various protection functions such as variable frequency control cabinets and complete status display, as well as single-pump and multi-pump control working modes, multiple main-standby pump switching modes and various starting modes. It can be widely used in industrial and agricultural production and various types of buildings for automatic control of water supply, drainage, fire protection, sprinkler pipe network pressurization, and HVAC hot and cold water circulation.

Inverter control cabinet has excellent internal quality, beautiful and durable appearance, convenient installation and operation, and is a safe and reliable companion for various types of pumps.

Typical applications: constant pressure water supply, air compressors, fans and pumps, central air conditioning, port machinery, machine tools, boilers, papermaking machinery, food machinery, etc.

Control type

1. Liquid level control: The control cabinet is equipped with a high-performance Key float switch, which automatically controls the opening and stopping of the water supply and drainage pump according to the high and low changes of the liquid level.

2, pressure control: external electrical contact pressure gauge or pressure controller, can automatically turn on and off the pump according to changes in the pressure of the pipe network, this type is widely used in domestic water supply and fire-fighting pressurization systems.

3, temperature control: external temperature controller, according to the set temperature range to open or close the pump, used in constant temperature, heat exchange systems and other occasions requiring temperature control.

4. Time control: The chassis panel is provided with a time setting button and a display. The user can control the on and off of the pump according to the timing needs, which is suitable for various timing or regular intermittent work mode control.

Feature analysis

1.Save energy

Compared with traditionally controlled motors, inverter-controlled motors have the most practical energy savings. The operating conditions of the motors supplied according to the demand for water injection and oil delivery are economical, which can save 48.8% of electricity

2. Reduced operating costs

The operating costs of traditional motors consist of three items: initial purchase costs, maintenance costs, and energy costs. The energy cost accounts for about 77% of the operating cost of the motor. By reducing the energy cost by 44.3%, coupled with the reduced impact on the equipment after the start of frequency conversion, the amount of maintenance and repair will also decrease, so the operating cost will be greatly reduced.

3.Improve pressure control accuracy

The frequency conversion control system has accurate pressure control capabilities. Match the pressure output of the motor to the amount of water injection required by the system. The output of the inverter-controlled motor changes with the speed of the motor. As the accuracy of the frequency control motor is improved, it can keep the system pressure change of the pipe network within the range of 3 pisg, that is, within the range of 0.2 bar, which effectively improves the quality of the working conditions.

4.Extend the service life of the motor

The inverter starts the motor from 0HZ, and its starting acceleration time can be adjusted, thereby reducing the impact on the electrical and mechanical parts of the motor at the time of starting, enhancing the reliability of the system, and extending the service life of the motor. In addition, variable frequency control can reduce the current fluctuations when the unit starts. This fluctuating current will affect the power consumption of the power grid and other equipment. The inverter can effectively reduce the peak value of the starting current to a minimum.

5.Lower motor noise

According to the requirements of the motor's working conditions, after the frequency conversion is installed, the motor's running speed is significantly reduced, so the noise during the operation of the motor is effectively reduced.

Features

1.Power switching and protection function of inverter control cabinet

The frequency conversion control cabinet is usually designed with a circuit breaker element, which is connected to the incoming power supply. It can help the frequency conversion control cabinet to complete the on-off operation of the circuit, and can provide protection when the circuit and the frequency converter are short-circuited or overloaded. In addition, the inverter cabinet can also cut off the power supply during the maintenance of the motor to ensure the safety of the operator.

2.Variable frequency speed regulation function of variable frequency control cabinet

The control panel of the frequency conversion control cabinet is provided with a potentiometer for frequency conversion speed regulation, which can send a command signal to the motor according to the output frequency of the operator to control the speed of the motor. Some products in the frequency conversion control cabinet are equipped with a power frequency switching function to ensure that when the inverter fails, the motor is switched back to the power frequency power supply through an automatic control loop.

3.Intuitive control function of inverter control cabinet

The cabinet of the inverter control cabinet is designed with display equipment and operation panel. It is connected to the electrical components inside the inverter control cabinet, which can directly display the operating status of the inverter control cabinet, and at the same time, it is convenient for the operator to control the operation of the inverter device and the motor. Controlled equipment performs field operations.

The cabinet of the inverter control cabinet is also installed with various instruments and indicators, such as voltmeters, ammeters, frequency meters, and power indicators, alarm indicators, operation indicators, power frequency indicators, and so on. The running and operating status of the frequency conversion control cabinet can be directly reflected on various instruments and indicators to achieve continuous monitoring of the working status of the frequency converter.

4.Safety protection function of inverter control cabinet

The inverter control cabinet collects various electrical components including the inverter in the cabinet. This can reduce the impact of the external environment on the electrical components, reduce the degree of environmental pollution of the electrical components, and reduce the operator of the inverter control cabinet. Danger of electric shock, so it has better safety protection effect.

Technical Parameters

1.Inverter control cabinet. Start the control cabinet directly

Control motor power: 0.37-15KW;

Control voltage: 380V;

Number of control pumps: 1-4.

2.Inverter control cabinet. Triangular start

Control motor power: 15-90KW;

Control voltage: 380V;

Number of control pumps: 1-5.

3.Inverter control cabinet. Automatic decompression start control cabinet

Control motor power: 15-160KW;

Control voltage: 380V;

Number of control pumps: 1-5.

4. Frequency conversion control cabinet. Fully automatic frequency conversion speed control cabinet

Control motor power: 0.18-250KW; control voltage: 380V;

Number of control motors: 1-7

Pressure control accuracy: 0.02MPa or -0.02MPa

Conditions of Use

Power supply: city power, self-provided power grid, diesel generator set; three-phase AC 380V, (-10%, + 15%), 50HZ

Applicable motor: general squirrel-cage asynchronous motor

Starting frequency: can be used for frequent starting, it is recommended not to exceed 20 times per hour

Protection level: IP41 or IP20

Changsha Zhongsheng Machinery Equipment Co., Ltd. 2014-2017 All rights reserved

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