FAQ
All VEIKONG products comply with international standards including ISO, CE and IEC, meeting safety and EMC access requirements of major global markets.
VEIKONG is one of the few domestic enterprises with independent R&D capabilities for core vector software algorithms for frequency converters. Our R&D team has 20 years of industry experience, holding 52 technical patents and multiple honors such as National High-Tech Enterprise and Shenzhen Specialized, Sophisticated, Unique and New Enterprise.
Our strong R&D strength ensures stable product quality. For example, our unique heat dissipation design enables continuous stable operation in high-temperature environments, making us a top choice for leading industry clients.
Every VEIKONG product passes strict quality inspections before delivery.
- Incoming components undergo dual manual and mechanical inspection.
- Circuit boards receive at least three layers of automatic three-proof paint coating for harsh environment adaptability.
- Initial complete machine test after assembly.
- 12-hour power-on aging test in high-temperature chamber.
- Final full-load machine test.
Only qualified products are delivered, keeping our delivery failure rate stably at 0.5%, which is fully proven by global customer feedback.
As a top 10 Chinese frequency converter manufacturer by performance, our products are positioned at a medium-to-high price level.
We offer unbeatable cost-performance prices for long-term strategic distributors, with tiered pricing based on order volume (larger orders mean better pricing).
We also provide annual sales rebates (2%-5%-8%) for qualified long-term distributors, plus extra support on payment terms, delivery and customization services.
VEIKONG offers one-stop services for premium distributors.
- Free professional product selection and pre-sales video training based on customers' application scenarios.
- 24-month after-sales warranty with free spare parts for component quality issues; lifelong online technical support, 24-hour fast response, and software update solutions within 2 hours. Our professional service is highly praised by global customers.
VEIKONG implements clear regional protection policies and keeps complete customer records. We sign exclusive agreements with exclusive distributors, strictly enforce market protection rules, and fully support the development of authorized distributors worldwide.
Orders under 10 units: in stock or delivered within 3 days; orders within 100 units: 7-14 working days. We can adjust production to shorten lead times for urgent orders.
Yes. Our professional technical team offers regular product and industry solution training. We also customize software for different industries:
- Flying shear & tracking shear: electronic cam & position algorithm
- Textile: dedicated floating frequency function to reduce thread breakage
- Hoisting: optimized start-stop control & brake logic
- PV water pump: customized software with 99.9% energy tracking efficiency
- Harsh environments: IP55 high-protection frequency converters
We provide logo customization, software and parameter optimization based on customer application needs.
Unlike other high-end brands, our MOQ for customized services is only 20,000 USD, supporting partners to grow their business steadily.
We have a professional R&D team with over 20 years of industry experience and innovative senior engineers.
VEIKONG invests no less than 20% of annual operating profit in R&D, optimizing products timely based on market feedback to keep long-term competitiveness.
We aim to provide first-class frequency converters and reliable after-sales support, focusing on long-term strategic partnerships with customers.
We treat distributors as mutual-supportive strategic allies, and spare no effort to help them become local market leaders, acting as their most reliable backup partner.
Benefits of VFD for Cranes
Smooth Start & Stop: No sudden swinging or jerking of the load.
High Starting Torque: Provides full torque even at low speeds for heavy lifts.
Reduced Mechanical Wear: Less stress on gearbox, brake, and wire rope.
Benefits of VFD for Spinning Frame:
Adjustable Speed: Allows spindle speed adjustment for different yarn counts and materials.
Constant Tension Control: Maintains consistent yarn tension throughout the winding process.
Reduced Yarn Breakage: Lower mechanical shock means fewer stops and higher productivity.
Benefits of VFD for CNC Machine:
Smooth Acceleration & Deceleration: Reduces shock to the spindle and tooling.
High Precision: Enables accurate speed regulation for fine surface finish.
Programmable Speed Profiles: Can set different speeds for drilling, milling, and tapping.
How to connect a pressure sensor?
Connect it to the inverter’s AI1, 10V, and GND.
How to use vector control(Motor parameter self-learning)?
- Set parameter P00.04 according to the actual situation of the motor, 1 means asynchronous open-loop vector, 2 is the asynchronous closed-loop vector
- Set P11.02-P11.06 motor parameter according to the motor nameplate, rated power, rated voltage, rated current, rated frequency, rated RPM. (Pay attention: Closed-loop vector control also needs to set P10.01 and P10.02 encoder parameters!)
- Set P11.10, 1: Stationary auto tuning(Motor and load unable to disengage); 2: Dynamic or rotational auto tuning(The motor can be separated from the load, or the load is less than 1/3 of the rated load)
- Press[RUN], the keyboard will display[tune], it means that the motor in the process of self-learning. After [tune] disappear, and there is no any fault display, it means that self-learning has been completed successfully!
(Remark: The motor will rotate during the rotation self-learning process, please pay attention to safety)
What’s the reason for the inverter to stop for unknown reasons during operation, and how to solve it?
- Set P00.06 to 0, use the keyboard “RUN” to start, and confirm whether it will stop. If it does not stop, it means that it is an external signal problem, otherwise it is a problem with the inverter parameters or other problems;
- Check whether the signal connection wire of the inverter is in good contact;
- Check whether the connector between +24V/PLC is in good contact;
- Check the r06.00 terminal signal to confirm whether the running command is interrupted;
- Confirm whether the power supply voltage of the inverter is too low.
Frequency converters stabilize production and improve quality through fault diagnosis. They indicate process problems and may need repair or replacement.
They connect with controls, process signals and PLCs. External interaction issues are often misread as converter faults. Consulting operators helps locate problems quickly.
Basic Troubleshooting Steps
- If the display or indicator does not light up: Check the input AC power first, then verify and restore the control power.
- If it fails to start or runs abnormally: Check fault codes and refer to the manual. Monitor parameters including input voltage, DC bus, output current, I/O and control status to identify start inhibition or speed signal abnormalities.
Common Faults and Solutions
- DC Bus Overvoltage Fault
Caused by voltage spikes or overhauling loads from machine inertia, triggering automatic protection shutdown. Stabilize power supply and adjust deceleration time. Add dynamic braking or regenerative power circuits for rapid deceleration processes.
- Overcurrent Fault
Usually due to loose power connections or damaged wires. Use the autotuning function for better motor control. Inspect mechanical wear and excessive friction. Stabilize input voltage and slow down the acceleration rate.
- High Starting-Load Current
Resulting from mechanical binding, material clogging/moisture, or excessive speed. Clear loads and debris before startup. Use converters with extended acceleration for smooth starting.
- Erratic Operation (No Fault Code)
Caused by external factors: Check for burnt or cracked components, and troubleshoot power quality issues such as grid fluctuations and surges, mostly due to harsh process conditions.
- Contamination Failure
Conductive contaminants like dust and moisture cause failures. Use proper NEMA enclosures. Clean fans and heatsinks monthly to avoid blocked cooling.
- Temperature Failure
Over-temperature leads to premature failure, while low temperature causes condensation and component damage. Control enclosure temperature, add cooling for high temperatures, and prevent moisture for low temperatures.
- Other Faults
Caused by improper application, changes in process, power supply or environment. Contact the manufacturer for technical support if faults remain unresolved.
Key Additional Points
- When communicating with operators, ask about machine status, grid fluctuations, on-site construction, and power-factor capacitor switching.
- For rapid deceleration, the motor acts as a generator. Dynamic braking dissipates excess energy through resistors, while regenerative power supplies feed energy back to the power grid.