Region: Middle East
Local Application Industry: Cable Manufacturing (Drive Systems for Winding/Pay-off Processes)
Associated VFD Model: SD300/SD3300 Series (0.75–500 kW)
Project Scale: Integrated into multiple cable production lines, serving numerous local manufacturing enterprises.
Project Background
The cable manufacturing industry in the Middle East is experiencing rapid growth. The local power grid operates at 3-phase 380V/50Hz, and frequent voltage fluctuations occur during peak summer electricity demand. Factory environments in the summer often exceed 45°C and are characterized by high dust levels and aridity, imposing stringent requirements on equipment heat dissipation and environmental protection. The winding and pay-off processes demand extremely high precision in speed control and exceptional consistency in tension control, serving as a critical test of the drive system's performance capabilities.
Customer Pain Points
* Inadequate Control Precision: Legacy drive systems lacked sufficient control precision, frequently leading to inconsistent cable diameters, surface defects, and high scrap rates.
* Frequent Over-temperature Faults: In high-temperature environments, over-temperature trips occurred frequently, resulting in an average of 5–8 unplanned production stoppages per month.
* System Complexity: The reliance on numerous peripheral devices—such as external PLCs and tension controllers—resulted in a complex system architecture with widely dispersed potential points of failure.
* High Energy Consumption: The low conversion efficiency of older VFDs led to excessive energy consumption and exacerbated heat dissipation challenges within the control cabinets.
Customized Local Solution
* Optimized Over-temperature Derating Strategy: Dynamically adjusts carrier frequency and output power to ensure continuous production operations even under high-temperature conditions.
* Enhanced Environmental Protection: Features an independent air duct design and triple-proof coating (moisture-proof, mold-proof, and salt-spray-proof) on PCBs to isolate dust and enhance heat dissipation efficiency.
* Integrated Tension Control: Incorporates built-in, cable-specific PID tension control algorithms and wire-break detection functions, eliminating the need for external tension controllers.
* Wide Voltage Input Redundancy: Configured to ensure stable operation within a voltage fluctuation range of ±15% of the rated voltage.
Product Performance
The SD300/SD3300 series utilizes closed-loop vector control to achieve 200% of rated torque output at 0 Hz, ensuring stable tension control even at low speeds and high torque demands. It integrates functions for calculating cable length, weight, and real-time speed, thereby eliminating the need for peripheral devices such as external length counters and significantly simplifying the overall system architecture. Additionally, it features a built-in braking unit, allowing for the flexible configuration of braking frequency and holding duration.
Project Operational Results
Significantly Improved Yield Rate: Enhanced wire diameter uniformity and surface quality have boosted the overall yield rate by over 8%.
Drastically Reduced Downtime: Unplanned downtime caused by drive-related faults has decreased by approximately 80%; the average monthly number of system trips has dropped to less than one, bringing production line availability to over 98%.
Highly Integrated System: The number of peripheral control devices has been reduced by nearly 60%, while both the required electrical cabinet space and the installation and commissioning cycle have been simultaneously reduced by approximately 30%.
