Safe Distance
The working position from which the operator stays clear of the danger zone, in particular from under the load and out of the line of motion. The greatest gain from a wireless remote control is that it makes this distance possible; but for that gain to be realised the operator must be able to see the load and its surroundings.
A wired pendant fixes the operator at a particular point, and that point is often close to the load. With a radio remote the operator chooses their own position: they can stand where they can see the load from the side, with an escape route clear and out of the line of motion.
Use three criteria when choosing a position:
- Visibility: the load, the hook and the target point must all be visible at once. If the view is obstructed, use a signaller.
- Escape route: your back must not be against a wall or a stack; there must be open ground you can retreat into.
- Line of motion: never stand in the swing plane of the load or in the direction it would topple.
There is also an upper limit to distance: approaching the range limit produces signal loss and unexpected stops. The product data gives an open-field range of about 150 m for the AXI ST series and about 100 m for the SF series; choose your actual working distance well below these figures.
Context in which this term is used: Wireless remote control installation: pairing, relays, safety