Variable Frequency Drive Control CabinetPrimarily used to adjust equipment frequency, reduce energy consumption, and ensure smooth startup, minimizing the damage to the motor from high currents during direct startup. It also features analog input (for speed control or feedback signals), PID control, pump switching control (for constant pressure), communication functions, macro functions (with different parameter settings for various scenarios), and multi-speed capabilities. Widely applicable in automatic control for various applications such as water supply and drainage, fire protection, sprinkler network boosting, and HVAC hot and cold water circulation in industrial and agricultural production and all types of buildings.
The Variable Frequency Control Cabinet is meticulously crafted by technical experts, who have thoroughly absorbed advanced domestic and international pump control experiences. After years of production and application, it has been continuously improved and optimized, resulting in a carefully designed and manufactured product.
The frequency converter control cabinet features various protection functions including overload, short circuit, phase loss, pump body leakage, motor overheating, and leakage protection, along with comprehensive status displays. It offers single pump and multi-pump control operation modes, multiple pump switching methods, and various starting options. It is widely applicable for automatic control in various scenarios such as water supply and drainage in industrial and agricultural production, fire protection, sprinkler system pressure increase, and HVAC hot and cold water circulation in buildings.
The in-built quality of this variable frequency control cabinet is excellent, with an aesthetically pleasing and durable design, easy installation and operation, making it a safe and reliable companion for all 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. Level Control: This control cabinet is equipped with a high-performance Key float ball switch, which automatically controls the start and stop of the water supply and drainage pumps based on the high and low changes in liquid level.
2. Pressure Control: Equipped with an external electric contact pressure gauge or pressure controller, it can automatically start and stop the pump based on changes in pipeline pressure. This model is widely used in domestic water supply and fire-fighting booster systems.
3. Temperature Control: External temperature controller to start or stop the pump based on the set temperature range, applicable to scenarios requiring temperature control such as constant temperature and heat exchange systems.
4. Time Control: The cabinet panel is equipped with a time-setting button and a display, allowing users to control the pump's on/off according to scheduled needs, suitable for various timed or regular intermittent operation modes.
Feature Analysis:
1. Energy conservation
Variable frequency inverter motor control, compared to traditional motor control, offers significant energy savings. The motor operating condition supplied according to water injection and oil delivery requirements is an economical running state, which can save electricity by 48.8%.
2. Reduced operating costs
The operating costs of traditional motors consist of three components: initial purchase cost, maintenance cost, and energy cost. The energy cost accounts for approximately 77% of the motor's operating costs. By reducing the energy cost by 44.3% and, with the reduced impact on the equipment after variable frequency start-up, the maintenance and repair volume also decreases, resulting in significantly lower operating costs.
3. Improve pressure control accuracy
The variable frequency control system boasts precise pressure control capabilities, matching the motor's pressure output to the system's required water injection volume. The output of the variable frequency control motor varies with changes in motor speed. Due to the enhanced precision in controlling the motor speed, it can maintain the system pressure variations within a 3pisg range, or 0.2bar, effectively improving the quality of the operating conditions.
4. Extend the lifespan of the motor
Variable-frequency inverters start motors from 0HZ, allowing adjustable startup acceleration to minimize the impact on electrical and mechanical components during startup, enhancing system reliability and extending the motor's lifespan. Furthermore, variable-frequency control reduces current fluctuations during the unit's startup, which can affect the power grid and other equipment's power usage. The inverter effectively minimizes the peak startup current to a low level.
5. Lowered the motor's noise
In compliance with the motor's operating conditions, the installation of variable frequency speed control significantly slows down the motor's rotation speed, thereby effectively reducing the noise during operation.
Variable Frequency Drive Operation Principle:
Typically, a device that converts fixed voltage and frequency AC power to variable voltage or frequency AC power is called an "inverter." This equipment first converts three-phase or single-phase AC power into DC power (DC). Then, it converts the DC power back into three-phase or single-phase AC power (AC). The inverter simultaneously alters the output frequency and voltage, effectively shifting the motor operating curve downwards on the n0 axis. Consequently, the inverter allows motors to start with lower starting currents and achieve higher starting torques, enabling the motor to start heavy loads.
Variable frequency drives offer basic functions such as voltage regulation, frequency adjustment, voltage stabilization, and speed control. Their internal structure is complex yet easy to use, making them not only suitable for motor startup but also widely applicable across various fields. They cater to a variety of power ratings, shapes, sizes, and applications. With technological advancements and cost reductions, variable frequency drives are sure to see even broader applications.
Features Introduction:
1. Variable frequency control cabinet power switching and protection function
Variable frequency control cabinets are typically designed with circuit breakers, which connect to the incoming power supply. They facilitate the on/off operation of the cabinet's circuit and provide protection against short circuits or overloads in the circuit and the variable frequency drive. Additionally, the variable frequency cabinet can disconnect the power during motor maintenance to ensure the safety of the operators.
2. Variable Frequency Drive Control Cabinet with Variable Speed Control Function
The control panel of the variable frequency control cabinet is equipped with potentiometers for variable speed adjustment, which can send command signals to the motor based on the operator's output frequency, controlling the motor's speed. Some products in the variable frequency control cabinet are set with an industrial frequency switching function to ensure that in the event of a variable frequency inverter failure, the motor can be switched back to industrial frequency power supply through an automatic control loop.
3. Intuitive control function for variable frequency control cabinets
The control cabinet of the variable-frequency control cabinet is equipped with a display device and an operating panel. It is connected to the electrical components inside the cabinet, allowing for a direct display of the cabinet's operating status. This feature facilitates operators in controlling the variable-frequency unit's operation and conducting on-site operations for controlled equipment such as motors.
The control cabinet of the variable-frequency control cabinet is equipped with various instruments and indicator lights, such as voltmeters, ammeters, and frequency meters, as well as power indicator lights, alarm indicator lights, operation indicator lights, and power frequency indicator lights, etc. The operation and status of the variable-frequency control cabinet can be directly reflected on the various instruments and indicator lights, enabling real-time monitoring of the variable-frequency inverter's working condition.
4. Safety protection function of the variable frequency control cabinet
Variable frequency control cabinets integrate various electrical components, including variable frequency drives, within the cabinet. This design minimizes the impact of external environments on the electrical components, reduces their exposure to environmental pollution, and lowers the risk of electric shock for operators, thus providing excellent safety and protection.
Technical Specifications:
1. Variable Frequency Control Cabinet. Direct Start Control Cabinet
Motor Power Control: 0.37-15KW
Voltage Control: 380V
Number of Pump Units: 1-4.
2. Variable Frequency Control Cabinet. Triangle Start
Control Motor Power: 15-90 kW
Control Voltage: 380V
Number of pump units controlled: 1-5.
3. Variable Frequency Drive Control Cabinet, Automatic Pressure Reducing Start Control Cabinet
Control Motor Power: 15-160 kW
Control Voltage: 380V
Number of pump units controlled: 1-5.
4. Variable Frequency Control Cabinet. Fully Automatic Variable Frequency Speed Control Cabinet
Motor Power Control: 0.18-250KW; Control Voltage: 380V
Number of control motors: 1-7 units
Pressure Control Accuracy: ±0.02 MPa.
Terms of Use:
1. Power Supply: Mains power, self-generated power grid, diesel generator set; three-phase AC 380V, (-10%, +15%), 50Hz;
2. Applicable Motors: Generally squirrel-cage induction motors.
3. Start-up Frequency: Can be started frequently; it is recommended not to exceed 20 times per hour.
4. Protection Grade: IP41 or IP20.
Environmental Conditions:
Altitude not exceeding 2,000 meters (use with reduced capacity above 2,000 meters), ambient temperature between -25℃ and +40℃, relative humidity not exceeding 95%, no condensation. Vibration less than 0.5G.
Application Scope:
1. Constant pressure water supply control for industrial, residential, and fire protection applications.
2. Air conditioning cooling water circulation with constant temperature and pressure control
3. City Plaza Music
4. Automatic water supply control for fountains.
