Manual-overview of system
•
The measured braking distance should be considerably below the calculated one!
•
By calculating the braking distance for the worst case can be established.This has to be below the
permissible limits.
Example: Calculation of the braking distance
input values:
Max. average acceleration: a = 2500mm/s² (z.B. max. possible acceleration)
lenghts of doorzone Xa = 110mm
lenghts of magnet 150mm - 40mm
Response time system SM011B inkl. Cont. Te= 40ms
9ms +30ms contactor
Response time Brake Tb = 200ms
dependant of the used brake
average deceleration = 2000mm/s2
dependant of the used brake
calculation of time until doorzone is left (detection time-leaving doorzone)
Tt =
√
2
∗
Xa
a
=
√
2
∗
110mm
2500mm
/
s²
Tt = 0,3s
calculation og ther total response time Tr (deelebrake)
Tr = Tt+Te+Tb
Tr= 0,3s + 0,04s + 0,2s = 0,54s
calculation of covered distance Xb during total response time Tr:
Xb = 0,5 * a * Tr² = 0,5 * 2500mm/s² * (0,54s)² = 364,5mm
calculation of the max. acomplished speed Vmax:
Vmax = a * Tr = 2500mm/s² * 0,54s = 1350mm/s
calculation of the stoppimng distance Xd:
Xd =
Xb
+
Vmax²
2
∗
ab
=
364,5 mm
+
(
1350mm
/
s
)
²
2
∗
2000mm
/
s²
=
820,2 mm
A3 would be met for this example.
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