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1126800
SmartPAC 2 with WPC Integration
Page 350
Chapter 6
SmartPAC 2 Run Mode
Tbm
is additional time added to the stop time of the press to allow for brake wear. You must
allow extra time for brake wear because any safety distance based only on stop time will
become too short as the brake wears. Tbm is calculated when you set the brake monitor for
SmartPAC 2. You must calculate and set the stop time limit before calculating safety
distance for the light curtain. You are told how to calculate
Tbm
when setting the stop time
limit.
Dpf
is the depth penetration factor. This is a measure of how far an object, like an operator's
hand, can move through the light curtain before the light curtain reacts. Dpf is related to the
object sensitivity of Shadow. Object sensitivity is the smallest diameter object Shadow will
detect anywhere in its field.
Object sensitivity (
S
) for Shadow V is 1.25" (3.2 cm). Based on
S
and ANSI B11.1–1988,
Dpf
= 3.3" (8.4 cm)
For Shadow V with one beam blanked,
S
= 2" (5.1 cm) and
Dpf
= 5.9" (15 cm). This means
Dpf
increases by 2.6" (6.6 cm) when you add one blanking window.
An example for calculating the safety distance using the ANSI formula
Below is an example of how to use the formula to calculate safety distance (
Ds
). First take
another look at the formula we must use:
Ds = K x (Ts + Tc + Tr + Tbm) + Dpf
Let's use these numbers for our variables in the formula, and assume that the 90° Stop-time
Test indicated 190 milliseconds:
K (hand speed constant) = 63 inches per second (set by OSHA)
Ts + Tc = 0.190 sec.
Tr = .030 sec. (response time of Shadow)
Let's take
Tbm
from example 2 from the Stop Time Limit calculations performed earlier in
this chapter.
Tbm = 0.210 sec. (brake monitor setting) – 0.175 sec = .035 sec.
Dpf = 3.3
Now let's put our numbers into the formula:
Ds = K x (Ts + Tc + Tr + Tbm) + Dpf
Ds = 63 x (0.190 + .030 + .035) + 3.3
Ds = (63 x .255) + 3.3
Ds = 16.1 + 3.3
Ds = 19.4"
The distance the light curtain must be mounted from the pinch point in our example is 19.9.”
When using the formula, be sure to do all calculations in this order:
(1) Add
Ts
+
Tc
+
Tr
+
Tbm
first.
(2) Multiply the result by 63.
(3) Add this result to
Dpf
. This is
Ds
.
If you do not follow this order, your safety distance calculation will be incorrect.
Содержание SmartPAC 2
Страница 192: ...1126800 SmartPAC 2 with WPC Integration Page 170 Chapter 2 Installing SmartPAC 2 and WPC ...
Страница 222: ...1126800 SmartPAC 2 with WPC Integration Page 200 Chapter 3 SmartPAC 2 Keyboard Displays and Operating Modes ...
Страница 294: ...1126800 SmartPAC 2 with WPC Integration Page 272 Chapter 4 SmartPAC 2 Initialization Mode ...
Страница 342: ...1126800 SmartPAC 2 with WPC Integration page 320 Chapter 5 SmartPAC 2 Program Mode ...
Страница 404: ...1126800 SmartPAC 2 with WPC Integration Page 382 Chapter 6 SmartPAC 2 Run Mode ...
Страница 448: ...1126800 SmartPAC 2 with WPC Integration Page 426 Chapter 7 SmartPAC 2 Fault Messages ...
Страница 476: ...1126800 SmartPAC 2 with WPC Integration page 454 Appendix C Updating SmartPAC 2 Firmware ...
Страница 478: ...1126800 SmartPAC 2 with WPC Integration page 456 Appendix D SmartView Remote Viewing and E mail Setup ...
Страница 480: ...1126800 SmartPAC 2 with WPC Integration page 458 Appendix E Upgrade from Original SmartPAC to SmartPAC 2 ...
Страница 482: ...1126800 SmartPAC 2 with WPC Integration page 460 Appendix F Replacing SmartPAC 2 PC Board ...
Страница 492: ...1126800 SmartPAC 2 with WPC Integration page 470 Glossary ...