Variable Frequency Control CabinetPrimarily used for adjusting equipment frequency, reducing energy consumption, and ensuring smooth startup to minimize the damage to the motor caused by high currents during direct startup. It also features analog input (for speed control or feedback signals), PID control, pump switching control (for maintaining constant pressure), communication functions, macro functions (with different parameter settings for various scenarios), multi-speed settings, and more. It is widely applicable to automatic control in various fields such as industrial and agricultural production, as well as water supply, drainage, fire protection, sprinkler network boost, and HVAC hot and cold water circulation in various types of buildings.

The Variable Frequency Control Cabinet is meticulously crafted through years of production and application, with technical personnel fully absorbing advanced domestic and international pump control experiences, and continuously refining and optimizing it.

The variable frequency control cabinet features multiple protection functions such as overload, short circuit, phase loss protection, pump body leakage, motor overheating, and leakage, as well as comprehensive status display. It offers single and multi-pump control modes, various main and standby pump switching methods, and various starting methods. It is widely applicable for automatic control in various scenarios such as water supply and drainage, fire protection, sprinkler network boost, and HVAC hot and cold water circulation in industrial and agricultural production and buildings.

The inverter control cabinet boasts excellent internal quality, an aesthetically pleasing and durable design, easy installation and operation, and serves as a reliable and safe companion for various 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: The control cabinet is equipped with a high-performance Key float ball switch, which automatically controls the on/off of the water supply and drainage pumps based on the high and low changes in the liquid level.

2. Pressure Control: Equipped with an external electrical contact pressure gauge or pressure controller, the pump can automatically start or stop based on changes in pipeline pressure. This model is widely used in domestic water supply and fire-fighting pressure boosting systems.

3. Temperature Control: External temperature controller, which turns the pump on or off based on the set temperature range, applicable to situations requiring temperature control such as constant temperature and heat exchange systems.

4. Time Control: The cabinet panel features a time-setting button and a display. Users can control the pump's on/off timing according to their schedule requirements, suitable for various timed or regular intermittent operation modes.

Feature Analysis:

1. Energy conservation

Variable frequency inverter motor control offers significant energy savings compared to traditional motor control. The motor operating conditions supplied according to water injection and oil flow requirements are economically efficient, achieving a power saving of 48.8%.

2. Reduced operational costs

The operational 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 total operational cost. By reducing the energy cost by 44.3% and, with the reduced impact on equipment after variable frequency start-up, maintenance and repair volumes also decrease, resulting in significantly lower operational costs.

3. Enhance pressure control accuracy

The variable frequency control system boasts precise pressure control capabilities. It matches the pressure output of the motor with the required water injection amount from the system. The output of the variable frequency control motor varies with changes in the motor's speed. Due to the enhanced precision in controlling the motor's speed, it can maintain the system pressure variations within a 3pisg range, or 0.2bar, effectively improving the quality of operation conditions.

4. Extend the motor's lifespan

The inverter starts the motor from 0Hz, with adjustable start-up acceleration time to minimize the impact on the motor's electrical and mechanical components during start-up, enhancing system reliability and extending the motor's lifespan. Moreover, variable frequency control reduces current fluctuations during the unit's start-up, which can affect the power grid and other equipment's power consumption. The inverter effectively minimizes the peak start-up current to a low level.

5. Lowered the motor noise

In accordance with the motor's operating conditions, after installing variable-frequency speed control, the motor's operating speed is significantly reduced, thereby effectively lowering the noise during operation.

Variable frequency drive operating principle:

Typically, a device that converts fixed voltage and frequency AC power to variable voltage or frequency AC power is called a "variable frequency drive." This equipment first converts three-phase or single-phase AC power into DC. It then transforms the DC back into three-phase or single-phase AC. The variable frequency drive simultaneously alters the output frequency and voltage, effectively shifting the motor operating curve downwards on the n0 axis. Consequently, the variable frequency drive allows motors to start with lower starting currents and achieve higher starting torques, enabling it to start heavy loads.

Variable frequency drives offer basic functions such as voltage regulation, frequency adjustment, voltage stabilization, and speed control. Although their internal structure is complex, they are easy to use. Therefore, they are not only used for motor starting but are widely applied across various fields. This includes a range of powers, shapes, sizes, and applications. With technological advancements and cost reductions, variable frequency drives are sure to gain even broader usage.

Feature Introduction:

1. Variable frequency control cabinet power switching and protection function

Variable frequency control cabinets are typically designed with circuit breaker elements, which connect to the incoming power supply. They facilitate the on/off operations of the variable frequency control cabinet and provide protection in the event of short circuits or overloads in the circuit and the inverter. Additionally, the frequency cabinet can also disconnect the power during motor maintenance to ensure the safety of the operators.

2. Variable Frequency Drive Cabinet with Variable Speed Control Function

The control panel of the variable frequency control cabinet is equipped with potentiometers for variable speed control, 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 a power frequency switching function to ensure that in the event of a variable frequency inverter failure, the motor can be switched back to power 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 unit and an operation panel, which are connected to the electrical components inside. It allows for a direct display of the variable-frequency control cabinet's operating status, facilitating the operator's control over the variable-frequency unit's operation and on-site operation of controlled devices 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 operating status.

4. Safety protection function of the variable frequency control cabinet

The variable frequency control cabinet integrates various electrical components, including variable frequency drives, within the cabinet. This design minimizes the impact of external environments on the electrical components, reduces the extent of environmental pollution affecting them, and lowers the risk of electric shock for the operators. Consequently, it offers excellent safety protection.

Technical Specifications:

1. Variable Frequency Control Cabinet. Direct Start Control Cabinet

Control Motor Power: 0.37-15KW

Control Voltage: 380V

Number of water pumps controlled: 1-4 units.

2. Variable Frequency Drive Control Cabinet. Delta Start

Control Motor Power: 15-90 kW

Control Voltage: 380V

Number of pump sets controlled: 1-5 sets.

3. Variable Frequency Control Cabinet. Automatic Pressure Reduction Start Control Cabinet

Control Motor Power: 15-160 kW

Control Voltage: 380V

Number of pump sets controlled: 1-5 units.

4. Variable Frequency Drive 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-provided grid, diesel generator set; 3-phase AC 380V, (-10%, +15%), 50Hz.

2. Applicable Motor: 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 Rating: IP41 or IP20.

Environmental Conditions:

Altitude not exceeding 2,000 meters (reduce capacity for use above 2,000 meters), environmental temperature between -25℃ to +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 fountain water supply control.