Calculating the minimum safety distance S according to EN 999

Calculating the minimum safety distance Saccording to EN 999 Safeguarding an area Making a danger point safe Access guarding Perimeter guarding

S = ? Calculating the minimum safety distance Saccording to EN 999

S = K x T + C Calculating the minimum safety distance Saccording to EN 999 General formula: S = Minimum safety distance in mm K = Approaching speed in mm/ms T = Time between interrupting the sensing field and machine standstill in ms C = Additional distance depending on resolution in mm S

Calculating the minimum safety distance Saccording to EN 999 Measures against over reaching Measures against reaching from the side Measures may be either screwed on mechanical parts or electrically locked doors. The sensing field of the AOPD must be the only access to the danger point S Measures against reaching from back Measures against under reaching

S = (K x T) + C t1 S t3 t2 S [mm] = (2 [mm/ms] x (t1+t2+t3) [ms]) + 8 (d - 14) [mm] Calculating the minimum safety distance Saccording to EN 999 Formula for AOPDs up to 40 mm resolution and perpendicular approach to the sensing field: S = Minimum safety distance in mm K = 2 mm/ms approaching speed T = t1 + t2 + t3 in ms t1: response time of the AOPD t2: response time of the safety interface t3: stopping performance of the machine C = 8 x (d - 14) in mm d = resolution of the AOPD (range 14 to 40 mm) If the result is lower than 100 mm, a minimum distance of 100 mm must be maintained. If the result is higher than 500 mm, K can be reduced to 1.6 mm/ms. In this case 500 mm is the minimum.

Looking at C: C = 8 x (d-14) : d 14 30 40 C 0 128 208 y = “slope of your finger” S [mm] = 2 [mm/ms] x (t1+t2+t3) [ms] + 8 (d - 14) [mm] Calculating the minimum safety distance Sfor example y = mx + b y = 8d – 112

Principle of a Stopping-Performance Measurement Device precision potentiometer point of stopping command Uref Uref moving part SLOWING-DOWN PATH path 250 mm hold output start STOPPING TIME logic unit stop 85 ms fixed part MAXIMUM SPEED standstill recognition 19.99 m/s tachometer Sensor Evaluation Unit

Resolution of an AOPD Resolution d = pitch p + lens diameter Ø d = p + Ø Channel Ø p

d < p + Ø Resolution of an AOPD Resolution d = pitch p + lens diameter Ø d = p + Ø Channel Ø p

d > p + Ø Resolution of an AOPD Resolution d = pitch p + lens diameter Ø d = p + Ø Channel Ø p d

Calculating the minimum safety distance Saccording to EN 999 Channel Channel S Stepping behind protection using master and slave units (different resolutions possible). Note: Calculate both for vertical and horizontal

H = 15 x (dmax - 50) [mm] dmax = H/15 + 50 [mm] S = K x T + C (< 850 mm) H < 1000 mm H < 300 mm is considered not to allow crawling underneath Calculating the minimum safety distance Saccording to EN 999 Direction of approach parallel to the sensing plane of the AOPD Relationship between height of the sensing plane above ground and resolution of the AOPD: d = resolution of the AOPD H = height of the AOPD above ground Minimum safety distance S: S K = 1.6 mm/ms T = (tAOPD + tInterface + tMachine) in ms d C = (1200 - 0.4 H) in mm Channel H Note: @300mm : 70mm resolution, consider RS4-4

S = K x T + C Calculating the minimum safety distance Saccording to EN 999 Access and perimeter guarding with AOPD Formula for multiple beam AOPDs: K = 1.6 mm/ms approaching speed T = tAOPD + tInterface + tMachine in ms C = 850 mm (arm length) 1100 mm 900 mm 700 mm 400 mm 300 mm

S H SFT Calculating the minimum safety distance Saccording to EN 999 S= K x T + C S =Safety distance in mm K = 1.6 mm/ms T = tAOPDDR+tInterface +tMachine in ms C = 1200 - 0,4 x H in mm Cmin = 850 mm SFT = Depth of protection field Hmin = 15 x (d - 50) H = Heights of scanning plain d = Resolution of AOPDDR d = 70 mm Hmin = 300 mm Hmax = 1000 mm • NOTE: for mobile applications resolutions of 150mm and less • Thermal scanners also see dust dirt, hot and cold!

Calculating the minimum safety distance S according to EN 999