Omron MC4700 - Installation; Reflective Surface Interference and Alignment

. . . . .
OMRON SCIENTIFIC TECHNOLOGIES INC.
Fremont CA USA
Tel: 1/888/510-4357 in USA and Canada
© OSTI 1209 PN99584-0050 Rev. E
Original Instructions
29
T
c
= the response time, in seconds, of the press or machine control circuit to activate the machine’s
brake.
NOTE! T
s
+ T
c
is usually measured together by a stop time measuring device.
T
r
= the response time of the 4700 system, in seconds. This response time is given in Table 14-1, Table
14-2 and Table 14-3.
▲
!
WARNING! When using a STI RM-1 with the 4700, add 0.008 seconds to the response times stated in Table
14-1
, Table 14-2 and Table 14-3.
T
bm
= the additional stopping time, in seconds, allowed by the brake performance monitor before it
detects stop time deterioration.
The T
bm
factor allows consideration for brake wear, adding extra stop time allowed by the brake
monitor. Therefore, T
bm
= Brake monitor set point - (T
s
+ T
c
).
NOTE! If the guarded machine is not equipped with a stop time performance monitor, a percentage
increase factor should be applied to the stop time of the machine to allow for braking system wear.
Contact your machine manufacturer for information.
D
pf
= This is related to the minimum object sensitivity of the 4700 system. By knowing the minimum
object sensitivity, S, of the 4700 system, D
pf
is read directly from Table 5-5, Table 5-6, Table 5-7 or
Table 5-8.
For a 4700 system with 12 mm minimum object resolution and without Exact Channel Select or
Floating Blanking active:
S =
0.47 inches (12 mm) and D
pf
= 0.67 inches (16.96 mm)
For a 4700 system with 20 mm minimum object resolution and without Exact Channel Select or
Floating Blanking active:
S = 0.79
inches (20 mm) and D
pf
= 1.75 inches (44.45 mm)
8.2 EUROPEAN SAFETY DISTANCE FORMULAS
The following discussion is based on standard EN999 and applies to light curtains used in industrial
environments.
8.2.1 SAFETY DISTANCE FORMULA FOR SYSTEMS WITH A MINIMUM OBJECT RESOLUTION OF 40 MM OR LESS
When the minimum object resolution of the system is 40 mm or less, use the following formula:
S = (K x T) + C
where:
S = the minimum distance in millimeters, from the danger zone to the detection point, line, plane or
zone.
K = 2000 mm/s
T
= the overall system stopping performance in seconds.
T = t
1
+ t
2
t
1
= response time of the safety light curtain in seconds. This response time is given in Table 14-
1, Table 14-2 and Table 14-3.
t
2
= maximum stopping time of the machine in seconds.
C = 8(d-14 mm), but not less than zero.