IDEC SG4 Type 4 Finger & Hand - Manual (Page 12)

SG4-B Series Instruction Manual
8
Practical examples
Let's suppose to have a light curtain with height = 600 mm
To calculate the distance of the device from the ESPE, in a vertical
position, the following formula is used:
S = K*T + C
where:
T = t
1
+ t
2
t
1
= ESPE response time + SE-SR2 relay release time (max 80 ms)
t
2
= Machine total stopping time.
C = 8 * (d – 14) for devices with resolution <= 40 mm
D = resolution
In all cases, if K = 2000mm/sec then S > 500 mm. Distance will have
then to be recalculated using K = 1600 mm/sec.
SG4-14-060 SG4-30-060
T 0.393 sec 0.394 sec
C 0 mm 128 mm
S 641.6 mm 758.4 mm
WARNING: The reference standard is EN 999 “Machine safety - the
positioning of the protective device based on the approaching speed of
the human body”.
The following information is to be considered as indicative and
concise. For correct safety distance please refer to complete
standard EN-999.
1.4. Typical applications
The SG4-B FINGER safety light curtains provide solutions in all
automation fields where the access to dangerous areas has to be
controlled.
In particular, the safety curtains can be used in stopping moving
parts in:
- Automatic machines;
- Packaging and cutting machines;
- Textile, wood-working and ceramic machines;
- Automatic assembling lines;
- Milling, lathe and shearing machines;
- Bending and metal-working machines.”