schmersal PSC1 Series Installation Manual page 153

Installation manual
Example for an automatic handling system:
Functional description:
The automatic handling system is used to pick up varying height lorry cabs automatically. After pick-up
the height of the cab is safely acquired so that the cab cannot be lowered below a certain height in the
working area. The automatic system must not exceed a maximum speed in the working area. After the
cab has been fully processed, it is set down again at the end of the processing line and the automatic
handling system returns via a return path to the start of the line to pick up a cab again....
Boundaries of the machine:
Spatial boundaries: there must be enough space for the workers in the working area so that all the
necessary work on the cab can be undertaken.... In the return there must be enough space for the
empty automatic system tackle...
Time-related boundaries: description of the service life, description of ageing processes that could
cause a change to machine parameters (e.g. brakes). Monitoring mechanisms must be provided for
such cases.
Application boundaries: the automatic system automatically collects new cabs and moves them
through a processing area. In the processing area there are workers...etc.
The following operating modes are provided: setting up mode, automatic mode and service
mode...etc.
Identification of hazards:
The following mechanical hazards are relevant on the automatic handling system:
Hazard 1: Crushing due to falling cab / lifting bar
Hazard 2: Impact due to falling cab / lifting bar
Hazard 3: Crushing due to fast lowering of the cab if there is a fault
Hazard 4:........
Risk analysis:
G1: The weight of the cab and the lifting bar is so high that irreversible crushing or fatalities may occur.
G2: Due to moving cab / lifting bar, impact with irreversible injuries may occur.
G3: ....
Risk assessment:
A risk reduction is necessary taking into account all operating conditions.
Inherently (risks from the project) safe design
Moving the cab in x and y direction in the working area is unavoidable. The cab must be moved
up/down and forwards in the processing area....
The following measures can be taken:
Avoid hazards due to excessively fast movements
Avoid hazards due to excessively small distances
PSC1-C-10 Installation manual V2.7 Page 153 of 174
Version: 57E