Amtech Electronics (India) Ltd has developed a groundbreaking control and monitoring system for EOT (Electric Overhead Traveling) cranes equipped with four-rope grabs. This innovative system integrates the operation of the crane with a variable frequency drive and crane controller, offering precise control and efficient monitoring. By eliminating mechanical synchronization issues and incorporating advanced automation, Amtech has revolutionized the handling of powder materials in industries such as cement, metal, and ports. Let's explore the features, benefits, and impact of this new generation control system.
Enhancing Grabbing Crane Efficiency:
Traditional grabbing cranes relying on mechanical synchronization through a differential gearbox often face problems such as backlash and time-consuming re-synchronization. However, Amtech's automation system overcomes these limitations. By employing a properly sized variable frequency drive, the automation system seamlessly controls operations like cross travel, long travel, hoisting, grabbing, and safety interlocks. The PLC system ensures speed control, thruster control, synchronization, and various interlocks, resulting in optimized performance.
Intelligent Grabbing Mechanism:
The four-rope grab mechanism employed in powder material handling plays a crucial role in the crane's efficiency. Amtech's control system offers both hydraulic and electrical operation options. In the electrical system, two rope and drum assemblies on the crab trolley facilitate grab operation, driven by an electrical motor. The motors are controlled by drives, allowing multiple speed operations, enhancing flexibility and productivity.
Overcoming Frequent Challenges:
The traditional grab control systems suffer from several common problems, including the limitations of mechanical differential limit switches and frequent replacements of power and rotor resistance contactors. Slip-ring and carbon brush maintenance, single phasing issues, burning of resistor boxes, and regular maintenance of current carrying contacts further compound these challenges. Amtech's system addresses these issues, resulting in a more reliable and efficient grabbing crane.
Key Features of the Control System:
Retrofitting capability using existing slip-ring motor or new induction motor.
Close loop control with encoder feedback for precise synchronization of hoisting and grabbing operations, ensuring proper load sharing.
Simplified grab position setting through the HMI (Human-Machine Interface), eliminating the need for tedious mechanical adjustments.
Latest series variable frequency drive with state-of-the-art engineered panel, providing protection against vibration and dusty environments, ensuring trouble-free operation.
Operator cabin equipped with a comprehensive monitoring system, enhancing ease of operation and providing real-time status updates.
User-friendly HMI with powerful diagnostic capabilities for quick troubleshooting, reducing downtime.
Elimination of slip-ring motor contactors, resistors, and thruster brakes through variable frequency drive control, minimizing maintenance requirements.
Benefits and Impacts:
Assistance provided from concept to commissioning ensures seamless integration of the control system.
The ability to utilize existing components in the retrofitting process reduces costs and maximizes uptime.
Minimized maintenance requirements result in reduced costs and increased operational efficiency.
Ease of setting open/close limits through the HMI streamlines operations and reduces the need for mechanical adjustments.
Optimized four-rope grab control minimizes cycle time and reduces stress on ropes, enhancing durability.
Increased reliability with less mechanical wear and tear leads to improved uptime.
Full motor protection safeguards the equipment and extends its lifespan.
Smooth crane operation and electronic braking reduce maintenance needs for the brake system.
Energy-saving features contribute to environmental sustainability and cost-effectiveness.
Easy troubleshooting capabilities reduce downtime and ensure uninterrupted operations.
Quick and safe commissioning minimizes project delays.
Qualified after-sales service provides ongoing support and maintenance.
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