Minimum Safety Distance - Pilz PSEN op2H Manuel D'utilisation

PSEN op2H Series
2.2.1.

Minimum safety distance

The safety distance of the safety device should be such that the
operator cannot reach the danger zone until the movement of the
hazardous machine part has come to a standstill (see Fig. 6).
According to the standards EN 999, 775 and 294, this distance
depends on four factors:
1 ESPE reaction time (time it takes for the signal at the OSSD
contact to switch from High to Low once the beams have
successfully been interrupted).
2 Machine's overrun time (time it takes for the machine to come to a
standstill once the ESPE reaction time has elapsed).
3 Resolution of the ESPE.
4 Approach speed of the object requiring detection.
Fig. 6
The formula for calculating the safety distance is as follows:
S = K (t
where:
S = Minimum safety distance in mm between the protected field and the
danger zone
K = The speed at which the object requiring detection (body or parts of the
body) approaches the danger zone, in mm/s
t = ESPE reaction time in seconds (Ch. 9 "Technical details").
1
t = Machine's overrun time in seconds
2
d = The resolution of the safety device.
C = 8 (d -14) for a safety device with a resolution ≤ 40mm
= 850 mm for a safety device with a resolution > 40 mm
Instruction Manual
+ t ) + C
1 2
10