High Voltage Variable Frequency Drive

1. Vector Control, Fast Response

By measuring and controlling the stator current vector of the AC motor, based on the field orientation principle, the excitation current and torque current of the AC motor are controlled separately, so as to achieve the purpose of controlling the torque of the AC motor.

The High Voltage Variable Frequency Drive has large starting torque, fast dynamic torque response, high control precision, and strong load-carrying capacity.

It can drive synchronous or asynchronous motors, and is especially suitable for impact loads such as ball mills, belt conveyors, and compressors.

2. Multi-machine Linkage, Power Balance

The High Voltage Variable Frequency Drive has a master-slave control function, and multiple frequency converters can form a master-slave control network through a data bus. One of them is set as the master, and the others as slaves. The master collects the status information of each slave in real time, and sends frequency and torque commands to each slave at the same time, so as to realize the power balance and comprehensive control of each frequency converter.

This technology is suitable for occasions that require power balance control, such as belt conveyors and friction hoists.

3. Comprehensive Waveform Display and Recording

The main control system of the High Voltage Variable Frequency Drive monitors the input current, voltage, output voltage and current in real time, realizes the display of their waveforms, and can also perform harmonic analysis on the voltage and current of each phase, which helps users master various electrical parameters of the equipment.

4. Black Box Function, Intelligent Analysis

The High Voltage Variable Frequency Drive has the function of automatically recording and displaying the operating status. It can view 200 points (100ms) of output current, output voltage, set frequency, operating frequency, input current and input voltage before and after protection, which is convenient for daily maintenance and rapid abnormality diagnosis.

5. Temperature Segmentation, Early Warning

The main control system of the High Voltage Variable Frequency Drive monitors and displays the temperature of each power unit in real time. When the temperature of multiple units exceeds the set alarm value, it gives an audible and visual alarm to remind users to deal with problems such as tripping of the cooling fan and blockage of the filter screen in time.

6. Disturbance-free Switching, Avoiding Impact

Frequency conversion to power frequency: The frequency converter brings the motor to the power frequency, detects the frequency, phase and amplitude of the power frequency grid, then adjusts the output of the frequency converter to be the same frequency and phase as the power frequency. After adjustment, the motor is connected to the grid end and then disconnected from the frequency converter.

Power frequency to frequency conversion: First, the High Voltage Variable Frequency Drive detects the frequency, phase and amplitude of the power frequency grid. After the frequency converter is switched in, it directly outputs the corresponding voltage vector to the motor, and finally the power frequency is withdrawn.

This technology can meet the needs of comprehensive control of multiple motors and soft start of large-capacity motors. The maximum current is less than or equal to the rated current, truly achieving fast soft switching without large current impact.

1. High and Low Voltage Ride-through, Unafraid of Fluctuations

When the user's main power supply is momentarily powered off, momentarily drops, or the factory power grid is switched, the frequency converter can ensure automatic and normal operation after the grid is restored within a limited time, enhancing grid adaptability. It can adapt to grid drops of different depths of U0 (100%-0%).

2. Dual-source Power Supply, Stable and Reliable

The control power supply adopts two power supplies: on-site power supply and main transformer secondary power supply, and the circuit power supplies are online hot backups for each other; if one power supply is cut off, the other can switch seamlessly to continue supplying power to the control power supply. At the same time, the relay protection circuit alarms and the HMI (Human-Machine Interface) displays which one is cut off.

3. Cabinet Anti-interference, Electromagnetic Compatibility

The whole cabinet of the High Voltage Variable Frequency Drive adopts an anti-interference design, and has passed EMC tests such as electrostatic discharge immunity test, surge (impact) immunity test, radio frequency electromagnetic field radiation immunity test, and electrical fast transient burst immunity test conducted by national authoritative institutions.

4. Dustproof and Waterproof, Closed Cycle

When using the air-water cooling method, it is especially suitable for sites with harsh environments. The hot air generated by the heat of the High Voltage Variable Frequency Drive returns to the room as cold air after passing through the outdoor water-cooled heat exchange system, forming a hot air-cold air circulation system to achieve the purpose of equipment heat dissipation. The circulating water used in the outdoor water-cooled heat exchange system can use various methods such as on-site external water sources and the establishment of water towers.

1. Flying Start Technology

When the motor is in any rotating state, whether it is rotating forward or reverse, the frequency converter can be started directly, quickly find the motor state, start from the current state of the motor and run to the set frequency and state.

2. Star Point Drift Technology

After the power unit is bypassed, through software control, the angle of the three-phase output voltage is automatically adjusted, and finally the output line voltage is balanced, which greatly improves the voltage utilization rate.

3. Multiple Control Methods

It can choose local control, remote control box control, DCS control, supports communication protocols such as MODBUS and PROFIBUS, frequency setting can be given on site, remote analog given, communication given, etc., and supports frequency preset and acceleration/deceleration functions.

4. High Power Density

The High Voltage Variable Frequency Drive unit is small in size, with modular design, compact overall structure and small space occupation.

5. DC Braking Technology

When the motor is in a rotating state (below 10Hz), DC braking current is applied to force the motor to stop from the rotating state.

1. The High Voltage Variable Frequency Drive shall be packaged in time after manufacture and passing the test; otherwise, it shall be properly protected to ensure that it is not contaminated or damaged.

2. After all components are properly packaged or boxed, other protective measures shall be taken during transportation to prevent loss, damage or theft.

3. The buyer's order number and shipping number shall be marked on the outside of the packing box.

4. Various packages shall ensure that all parts of the High Voltage Variable Frequency Drive are not damaged, lost, deformed, dampened or corroded during transportation.

5. There shall be obvious packing, storage and transportation signs on the packing box (according to GB191).

6. The whole product or separately transported components shall meet the requirements of transportation and loading.

7. The technical data provided with the High Voltage Variable Frequency Drive product shall be complete, and the quantity provided shall meet the requirements of GB11032.

Q: What protection functions can the High Voltage Variable Frequency Drive provide?

A: The High Voltage Variable Frequency Drive can provide functions such as motor overcurrent, overall overvoltage, overall undervoltage, unit overcurrent, unit overvoltage, unit overheating, unit input phase loss, and optical fiber communication failure.

Q: What are the common faults of the High Voltage Variable Frequency Drive and their treatment schemes?

A: 1. High voltage tripping: The possible causes of this fault are insulation breakdown and ground fault. For emergency treatment measures, it is recommended that you use a 2500V megohmmeter to test the cable insulation (≥100MΩ).

2. Unit overvoltage: The cause of this fault is the unbalanced DC bus voltage. It is recommended that you check the unit fuse (replace with a fuse of the same specification when it is blown).

3. Motor abnormal noise: The causes of this fault are excessive output harmonics and bearing wear. To solve this problem, it is recommended that you install an output filter and test the bearing vibration value (≤2.8mm/s).

Q: What are the key parameters during the commissioning of the High Voltage Variable Frequency Drive?

A: 1. Start-up parameters:

The current limit value is set to 150%~200% of the rated current (to avoid impacting the power grid);

The acceleration time is set according to the load inertia (such as 15~30 seconds for fans, 30~60 seconds for compressors).

2. Protection parameters:

The overvoltage protection value is set to 110% of the rated voltage (to prevent tripping caused by power grid voltage fluctuation);

The motor temperature protection threshold is set according to the insulation class (155℃ for class F insulation).

Q: How to troubleshoot when the frequency converter fails?

A: Check the cause according to the fault code displayed by the frequency converter and the corresponding frequency converter manual. If the problem is still not solved, you can contact our manufacturer's technical support.

Q: Does the frequency converter need maintenance? How to maintain it?

A: Regular maintenance is required, including:

Check whether the wiring is loose.

Clean the inside of the frequency converter and the cooling fan.

Check whether the frequency converter parameter settings are normal.

Test whether the protection function is effective.

Q: What is needed for a detailed quotation?

A: Please inform us of the current, voltage, power, purpose, etc.

Factory inspection is an important part of quality control. We have established a systematic and standardized factory inspection system, and we will strictly carry out inspections and tests in all in-plant production links. The scope of inspection includes the incoming inspection of raw materials and components, the processing, assembly and testing of components, and the factory test. We are committed to controlling the quality of High Voltage Variable Frequency Drives from the source, ensuring that every production link meets the established standards, and finally delivering products that can stably and reliably meet or even exceed customer expectations and requirements.

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