Crane Sentry® Pre-Alarm Activation Module

Description

Key Features

• Provides a pre-alarm set point
• (2) additional mechanical NO/NC relay outputs (8A);

The Crane Sentry Pre-alarm option is a feature within crane safety and collision detection systems, particularly those manufactured by Laser-View Technologies under the “Crane Sentry” brand. It’s designed to provide an early warning before a potentially dangerous condition, such as an overload or collision, becomes critical.

Here’s a breakdown of its description, features, and benefits:

Description:

The pre-alarm option typically involves a visual and/or audible alert that activates when a crane approaches a pre-set limit or condition, but before the “main” alarm or function limitation kicks in. This gives the operator and nearby personnel valuable time to react and prevent an incident.

For example, in a rated capacity limiter system, the pre-alarm (often a yellow indicator) might illuminate when the crane reaches 90% of its maximum rated capacity, whereas the main overload alarm (red indicator) would activate at 100%, often coupled with function limitations.

Similarly, in collision avoidance systems, a pre-alarm could sound when a crane is still a certain distance from an obstacle or another crane, allowing for a controlled slowdown or stop, rather than an abrupt halt when it’s too close.

Features:

• Adjustable Thresholds: The pre-alarm can often be programmed to activate at specific distances (for collision avoidance) or percentages of load capacity (for overload protection).
• Audible and Visual Signals: It typically includes both sound (beeps, gongs) and light (flashing LEDs, bar graphs) to ensure the warning is noticed in various industrial environments.