- 12-
l
For a pressure machine in which the slider can stop at any position of the stroke, the safety
distance is calculated by formula (1).
Therein:
S
--Safety distance (mm);
K
- The speed of a person's body or part near a dangerous area (mm /s);
T
- Total braking time of the system (s);
C
--Additional distance (mm);
l
For a pressure machine in which the slider can stop at any position of the stroke, the safety
distance is calculated by formula ( 2).
Therein:
S
--Safety distance (mm);
K
- The speed of a person's body or part near a dangerous area (mm /s);
C-
-Additional distance (mm);
T
s
- The time from the hand away from the light curtain to the slider of the pressure machine
reaching the bottom dead center (s). It can be calculated according to formula (3) or measured in
practice.
Determination of K value
l
When the light curtain of safety light curtain is installed horizontally, the speed should be 1600
mm/s.
l
When the light curtain of the safety light curtain is installed vertically, if the safety distance is
not more than 500 mm, the speed should be 2000 mm/s; If the safety distance is larger than 500
mm, the speed should be 1600 mm/s.
The determination of T and T
s
l
Total braking time of the system T includes the response time of safety light curtain and
braking time of pressure machine.
l
Response time of safety light curtain is given by the supplier of safety light curtain.
