User Manual

SAFETY
Safety handbook page - 27 -
PNSPO
Prevention of defeat using the hand and other parts of the body:
- Arrangement of the control actuating devices on a horizontal or nearly horizontal
surface at least 1100mm above floor or level of access.
-
Arrangement of the control actuating devices on a vertical or nearly vertical surface
with protective collar(s) around the control actuating devices and/or shield(s).
-
For this configuration
use the test cone
6.1.2 EN 999, Calculation of the required safety distance
Because an operator may be able to access the dangerous zone before the hazardous
movement of the machine is stopped, a safety distance must be determined.
The calculation of this distance is described in EN 999(1998) , clause 8.
The minimum distance of the nearest actuator to the danger zone shall be calculated
using this formula:
S = (K x T) + C S = minimum safety distance in millimetres
K = approach speed in mm per second
where:
T = overall system stopping performance in
seconds
K = 1600 mm/s C = additional distance in mm
C = 250 mm
Note: If the risk of encroachment by the hands or part of the hands towards the danger
zone is eliminated while the actuator is being operated, e.g. by adequate shrouding,
then C may be zero, with a minimum allowable distance for S of 100mm.
Example:
Identify the off time of all components in the system (Control unit, Contactors, valves…
.
It is recommended to verify this time with an additional stop time measuring.
Then you can calculate the safety distance using e.g. T = 60 ms (0,06 s) to:
S = (1600mm/s x 0,06s) + 250 mm = 346 mm
≥ 1100mm