Rockwell Automation 440L GuardShield Type 4 and Remote Teach User Manual - Manual (Page 11)

R
GuardShield™ Safety Light Curtain User Manual
9
Original instructions
Response Time
The response time of the GuardShield safety light curtain depends on
the height of the protective field, the resolution and the number of
light beams as well as the coding of the system.
The response time of a cascading system is the response time of the
interrupted individual segment pair’s response time.
Determining the Safety Distance
The light curtain must be mounted with proper safety distance
• From the point of danger
• From reflecting surfaces
US Safety Distance Formula
This distance, referred to as the safety distance, must be properly
calculated prior to determining the safety light curtain protective
height and mounting the light curtains on the machine. Failure to
properly calculate this safety distance may result in operator injury.
In the United States there are two formulas that are used to properly
calculate the safety distance. The first, the OSHA formula, is the
minimum requirement for the calculation of the safety distance. The
second formula, the one recommended by Rockwell Automation, is
the ANSI formula, which incorporates additional factors to be
considered when calculating the safety distance.
IR Beam
Floating Blanking
Deactivated
Floating Blanking
1 Channel Active
Floating Blanking
2 Channels Active
1
2
3
4
5
Machine Stop On On Stop Stop On On On On Stop Stop Stop
Resolution [mm
(in.)]
Protective
Height [mm
(in.)]
Number of
Beams
Response Time
w/o Coding
Response Time
w/Coding
14 (0.55) 160 (6.3) 16 20 ms 30 ms
14 (0.55) 320 (12.5) 32 20 ms 30 ms
14 (0.55) 480 (18.8) 48 20 ms 30 ms
14 (0.55) 640 (25.1) 64 20 ms 30 ms
14 (0.55) 800 (31.4) 80 20 ms 30 ms
14 (0.55) 960 (37.7) 96 20 ms 30 ms
14 (0.55) 1120 (44.0) 112 20 ms 30 ms
14 (0.55) 1280 (50.3) 128 20 ms 30 ms
14 (0.55) 1440 (56.6) 144 20 ms 30 ms
14 (0.55) 1600 (62.9) 160 25 ms 35 ms
14 (0.55) 1760 (69.2) 176 25 ms 35 ms
Resolution [mm
(in.)]
Protective
Height [mm
(in.)]
Number of
Beams
Response Time
w/o Coding
Response Time
w/Coding
30 (1.18) 160 (6.3) 8 20 ms 30 ms
30 (1.18) 320 (12.5) 16 20 ms 30 ms
30 (1.18) 480 (18.8) 24 20 ms 30 ms
30 (1.18) 640 (25.1) 32 20 ms 30 ms
30 (1.18) 800 (31.4) 40 20 ms 30 ms
30 (1.18) 960 (37.7) 48 20 ms 30 ms
30 (1.18) 1120 (44.0) 56 20 ms 30 ms
30 (1.18) 1280 (50.3) 64 20 ms 30 ms
30 (1.18) 1440 (56.6) 72 20 ms 30 ms
30 (1.18) 1600 (62.9) 80 20 ms 30 ms
30 (1.18) 1760 (69.2) 88 20 ms 30 ms
Determining Stop Time: The measurement of
stopping time (Ts) must include the stopping
times of all devices in the stop circuit. Not
including all device and control system
elements when calculating Ts will result in an
inaccurate safety distance calculation.
IMPORTANT
ATTENTION
The GuardShield safety light curtains must be
mounted at a sufficient distance from the pinch
point or point of operation hazard to ensure
that the machine stops before a person’s finger,
hand, arm(s), or body reaches the hazard.
Regardless of the calculated safety distance,
GuardShield safety light curtains should never
be mounted closer than six inches from the
point of operation or pinch point hazard.
IMPORTANT