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Measurement of overtravel time
and determination of safety distances

Measurements of overtravel time provide an essential basis for the correct positioning of protective devices

Laserscanner · Safeguarding of danger zones (example)

For the calculation of the minimum depth of the protective field, in accordance with the directive DIN EN 61496-3 and the norm DIN EN 999, the following relations apply:

S = K * T + C

T = T_AOPDDR + T_Mach. + (T_after. * L_after.)

C = 1200 - 0,4 * H

Step 1: Calculate safety distance S
	T_AOPDDR (s)
	T_Mach. (s)
	T_after. (s)
	H (mm)
Take the reflectors into account (10%)
	C (mm)
	S (mm)

Laserscanner · Safeguarding of danger zones (example)

Here:

S	is the safety clearance - i.e. the distance from the danger zone to the point or line of detection.
K	= 1600 mm/s, the speed of approach of a person or of a person's bodily parts.
T	After-run time of the entire system, response time of the laser scanner T_AOPDDR, response time of the machine T_mach. and after-run time of the machine T_after.Taking into account wear and tear on the brake L_after = 1.1; otherwise L_after = 1
C	= 1200 mm - 0,4 * H Safety related constant to take into account penetration of the danger zone before the protective device is triggered. C_Min = 850 mm;
H	Height of the level of measurement value registration from the point of reference. H_Min = 15 * (d - 50) = 300 H_Max = 1000;
d	Resolution of the scanner (70 mm breadth of protective field)

The depth of the protective field, in relation to the direct distance between the danger zone and the detection point or detection line, is calculated on the basis of the following formula: Here the following terms are used:

Here the following terms are used:

S_T = S + Z_Ges + Z_AU

Z_Ges = Z_SM + Z_REFL

Maximum range of protective field:

S_{BDIFF =}G_BDIFF + S + Z_Ges

Here:

S_T	Depth of protective field, distance from the danger zone to the detection point or detection line, including the additions
Z_Ges	Sum of the system-specific and application-related additions to the protective field
Z_SM	Measurement error by the scanner, with dust algorithm enabled Z_SM = 98, if S_MAX > 3500 mm Z_SM = 81, if S_MAX < 3500 mm
Z_REFL	Addition to take reflectors into account, if Reflektoren, if yes Z_REFL = 100
Z_AU	Addition for the undercut (at the front)
G_BDIFF	Greatest breadth of danger zone
S_BDIFF	Greatest breadth of protective field
S_MAX	Maximum range of protective field

Step 2: Calculate the depth of the protective field ST and the maximum range of the protective field S_MAX
	Z_AU (mm)
	G_BDIFF (mm)
consider reflectors
	Z_SM
	Z_Ges (mm)
	S_BDIFF (mm)
	S_T (mm)
	S_MAX (mm)

Step 3: Check wether the scanner arrangements leaves any areas unmonitored. Safeguard any blind spots by implementing additional protective devices.

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last Update: 2011-06-14