With the continuous growth of the social economy, the demand for cooling, heating, and hot water supply in both public and residential buildings has become increasingly common. Traditionally, air conditioning systems used chillers for cooling and boilers for heating, or lithium bromide units to provide both cold and hot water. However, the use of boilers as a heat source leads to high environmental pollution and increased operational costs. On the other hand, using chillers with heat pump functions to generate hot water can improve the overall energy efficiency ratio and reduce energy consumption. Additionally, when chillers are equipped with horizontal shell-and-tube condensers and evaporators, they offer advantages such as simple structure, stable heat exchange, long-term efficiency, and easy maintenance, making them ideal components for central air conditioning systems.
In most chiller systems, the main motor starts using a star-delta electromechanical control method. However, this approach often results in contactor burnout due to high inrush currents during startup, leading to frequent replacements and difficult maintenance. To ensure reliable operation and reduce failure rates, the Schneider ATS48 soft starter is employed. This device controls the thyristor SCR gate trigger circuit to regulate and limit the motor’s starting current, ensuring smoother and more controlled motor startups.
During the entire start-up process, the motor's current remains stable, reducing the impact on the power grid and eliminating transient current surges. Moreover, the soft-start function allows for adjustable start time and current limits, offering greater flexibility for different applications.
**1. How does ATS48 work?**
The ATS48 soft starter controls the motor's start and stop by regulating the voltage and torque output. It uses thyristor SCRs as power switching elements. Each phase of the AC circuit requires two anti-parallel-connected SCRs to allow bidirectional current flow. For three-phase loads, six SCRs are needed in total. The thyristors are triggered at different points in the waveform to control the voltage supplied to the motor, thereby managing acceleration and inrush current effectively.
The ATS48 employs torque control, where the actual motor current is detected to estimate power and loss, allowing precise torque control. Unlike conventional soft starters that only adjust voltage, the ATS48 ensures a smoother start by directly controlling torque, which improves performance, especially during the later stages of acceleration.
**2. Application of bypass contactor**
Once the thyristor is fully conducting, a relay signal activates the bypass contactor, transferring the current from the soft starter to the contactor. This reduces power loss and extends the contactor's lifespan. When the system stops, the thyristor is fully turned on, and the bypass contactor is disconnected, returning the current path back to the thyristor. This design minimizes heat generation and enhances system efficiency.
**3. Advantages of using the Schneider soft starter ATS48 to control the chiller**
(1) Torque control ensures smooth start and stop, avoiding sudden speed changes.
(2) Arcless switching through the bypass contactor extends contactor life by reducing arcing.
(3) Reduced power loss improves system efficiency and lowers maintenance needs.
(4) Digital control via microprocessor enhances reliability and compactness.
(5) Built-in thermal protection eliminates the need for separate thermal relays.
(6) Advanced fault detection and protection features improve system safety and reduce component requirements.
(7) Communication capabilities allow easy integration into larger control systems, enhancing monitoring and management.
**4. Conclusion**
By integrating a soft starter like the ATS48 into chiller systems, overall system performance and reliability are significantly improved. It increases operational efficiency, reduces maintenance costs, and enables real-time monitoring through communication functions. This makes the entire control system smarter, more efficient, and easier to manage.
Electric Retractable Gate
This advanced access control system integrates cutting-edge functionalities for safety, adaptability, and durability. Equipped with a high-resolution scrolling LED display (300–500-word capacity), it enables real-time information broadcasting for event promotions, directional guidance, or security alerts. Its intelligent infrared anti-collision system employs precision sensors to detect obstacles within 20–30 cm, triggering an immediate reversal mechanism to safeguard pedestrians and vehicles.
Operational flexibility is ensured through dual-mode clutch design: Automatic Mode engages smooth, sensor-driven opening/closing via worm-gear transmission, while Manual Mode allows effortless override during power outages or maintenance. The modular control architecture features an intuitive touch panel, tactile push-button switches, and RF remote control (100m range), supporting seamless integration into smart building ecosystems.
Constructed with marine-grade stainless steel and aerospace aluminum alloys, the door body utilizes a parallelogram hinge mechanism for vibration-free, noiseless operation across 500,000+ cycles. The drive unit incorporates a brushless DC motor with torque optimization algorithms and thermal protection, paired with a self-lubricating worm-gear reducer for energy-efficient performance (IP65-rated). Optional upgrades include IoT connectivity for cloud-based access logs, anti-pry alarms, and adaptive speed modulation based on environmental conditions.
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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hongfadoor.com