Overview

Resistance Boxes are essential electrical control devices used in EOT cranes, gantry cranes, and overhead hoists to regulate current flow and control motor speed. They play a critical role in smoothly starting, stopping, and controlling the motion of cranes by providing adjustable resistance in the circuit. Resistance boxes ensure safe and precise operation, protecting crane motors from sudden electrical surges and overloads.

These devices are widely used in industrial crane systems where controlled acceleration and deceleration are crucial for safe material handling.

Key Features

• Adjustable Resistance: Allows precise control of motor speed and torque.

• Durable Construction: Made for heavy-duty industrial environments.

• Enhanced Safety: Prevents electrical surges and motor damage.

• Smooth Operation: Ensures gradual acceleration and deceleration of crane movements.

• Low Maintenance: Reliable performance with minimal servicing.

                             

How It Works

The Resistance Box operates by:

• Connecting in series with the crane motor circuit to limit the current during motor start-up.

• Providing adjustable resistance through a dial or switch, allowing the operator to control motor speed and torque.

• Reducing mechanical stress on the crane hoist, trolley, and bridge motors by enabling gradual acceleration and deceleration.

• Once the motor reaches its rated speed, the resistance can be bypassed or reduced, ensuring efficient and smooth operation.

This system protects crane components, extends their lifespan, and improves overall operational efficiency.