Region: Southeast Asia
Local Application Sector: Residential Elevators (Low-to-Mid-Rise Residential Buildings and Small Commercial Structures)
Associated VFD Models: SD320L / SD310L Series (3.7–15 kW)
Project Scale: Over 100 residential elevators retrofitted or newly installed to date, spanning multiple residential communities and commercial complexes.
Project Background
Rapid urbanization in Southeast Asia has driven a surge in demand for elevators; however, power grids in certain regions remain weak, characterized by significant fluctuations in single-phase 220V voltage. Furthermore, the local climate—marked by high temperatures and high humidity—places immense stress on the insulation and heat dissipation capabilities of electrical equipment. Many low-to-mid-rise residential buildings still rely on traditional relay-controlled elevators, which suffer from prominent issues such as poor ride comfort, high energy consumption, and frequent malfunctions.
Customer Pain Points
Traditional control systems suffer from vibration during startup and braking, as well as inaccurate floor leveling, leading to a high volume of resident complaints. Motors lack the ability to adjust speed dynamically based on load, resulting in severe energy waste. Voltage sags frequently cause elevator shutdowns and passenger entrapment, while power surges have previously triggered multiple instances of control mainboards burning out. Moreover, these systems often lack critical safety features—such as overspeed protection—making it difficult to comply with current safety standards.
Customized Local Solution
Optimized input voltage tolerance range to withstand grid fluctuations ranging from -15% to +10%;
Incorporation of high-capacity capacitor modules, independent air ducts, and "three-proof" (moisture-proof, mold-proof, and salt-spray-proof) PCB coatings; includes built-in DC reactors and braking units to enhance efficiency and moisture resistance;
Configuration of multi-segment S-curve acceleration/deceleration profiles and pre-torque compensation to ensure smooth starts/stops and precise floor leveling;
Activation of multiple safety logic functions—including overspeed protection, door pre-opening, and contactor adhesion detection—along with support for 48V battery-powered emergency evacuation.
Product Performance
The SD320L series employs closed-loop vector control technology, offering compatibility with both asynchronous and permanent magnet synchronous motors, as well as support for various encoder interfaces. Its integrated open-loop/closed-loop design allows for on-demand mode switching, striking an optimal balance between cost-efficiency and precision. The product features comprehensive lightning protection and anti-interference designs—meeting stringent EMC standards—making it highly suitable for the thunderstorm-prone climate of Southeast Asia.
Project Operational Results
Elevator Experience Fully Upgraded: The implementation of S-curve profiles and pre-torque compensation has yielded significant results; leveling accuracy has reached the millimeter level, and related complaints have dropped by over 90%.
Energy Consumption Significantly Optimized: Through load-adaptive speed control and power factor correction, the average energy consumption per elevator unit has been reduced by approximately 30%.
Highly Reliable Operation: Since commissioning, there have been no incidents of abnormal shutdowns or mainboard failures caused by power grid fluctuations; the rate of unplanned downtime has decreased by over 85%, accompanied by a corresponding reduction in maintenance costs.
