Stopping systems in cleanroom cranes: defining the limits of the lifting range

Cranes (18)

A cleanroom crane does not operate in unlimited space. Its movement is confined to a clearly defined lifting range determined by the runway structure and the mechanical design of the system. That range defines where loads may be transported and positioned.

Protecting those boundaries is essential. For that reason, cleanroom cranes are equipped with dedicated stopping systems at the ends of the runway.

ENG Stopsystem 1

Protecting the boundaries of the lifting range

Stopping systems are installed at the outer limits of crane travel. Their purpose is straightforward: to ensure that neither the crane nor the trolley can move beyond the permitted working area.

This protection prevents the crane from;
• the crane is brought to a controlled halt before reaching the mechanical end stop;
• keeps loads within the intended lifting range;
• and safeguards the structural integrity of the system.

In other words, stopping systems are not about avoiding objects within the working area, but about enforcing the limits of that area itself.

Two components, two functions

Although both are located at the end of the runway, the stopping system consists of two distinct elements with different responsibilities.

Limit switch

The limit switch is activated before the crane reaches the physical end of the runway . When a predefined position within the lifting range is passed, the switch signals the drive system to slow down or stop. This allows the crane to decelerate in a controlled and predictable manner, ensuring that it comes to rest before the mechanical boundary is reached.

In normal operation, the limit switch provides a gradual and precise stop at the limit of the lifting range

End stop

The end stop is positioned at the very end of the runway, the end stop defines the crane’s absolute mechanical travel limit. It ensures that movement cannot extend beyond the structurally permitted range.

The end stop is not intended for regular operation, but serves as the final mechanical safeguard of the system.

Reliability within defined limits

By combining controlled deceleration with mechanical restriction, the lifting range is protected in two stages. First, movement is slowed and brought through the limit switch. Only if that controlled stop is exceeded does the end stop come into play.

This layered approach enhances operational reliability and ensures that the crane remains within its designed working area at all times. In cleanroom environments, where predictability and system stability are essential, stopping systems are therefore a fundamental part of the overall crane design.

Do you have questions about lifting range limits or the implementation of stopping systems in your cleanroom crane?
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