Wintriss SmartPAC 2, User Manual

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SmartPAC 2 with WPC 2000 Integration User Manual 1128600
Run Mode 6-27
Example: Calculating the Safety Distance for a Light Curtain Using the ANSI Formula
The ANSI formula is
Ds = K x (Ts + Tc + Tr + Tbm) + Dpf
The following value is a constant:
K = 63 inches per second
We will use the following values for the variables in the formula:
Ts + Tc = 0.190 sec. (result of the 90° stop-time test)
Tr = 0.018 sec. (response time of Shadow 9 with greater than 110 in. (2800 mm) combined
length including cascaded heads (see Table 6-2, page 6-25.)
Tbm = 0.035 sec. (see Example 2 in
Calculating the Stop-time Limit
, page 4-31)
Dpf = 3.07
Putting these values into the formula, we get:
Ds = 63 x (0.190 + 0.018 + 0.035) + 3.07
Ds = (63 x 0.284) + 3.07
Ds = 15.309 + 3.07
Ds = 18.379 in.
The light curtain must be mounted 18.379 in. away from the pinch point.
When using the ANSI formula, be sure to perform the 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 no follow this order, your safety distance calculation will be incorrect.
The OSHA Safety Distance Formula
OBSERVE THE CORRECT SAFETY DISTANCE
• Calculate the safety distance carefully according to the instructions below, and mount your light
curtain heads at least the calculated distance from the hazardous area.
• Mount your light curtain heads at least 7.5 in. (191 mm) from the hazardous area, regardless of
the calculated safety distance.
• Be sure your value for Ts (i.e., stopping time) includes the response times of all devices that
react to stop the press. If your measurement of stop time does not include the response times of
the press control, light curtain, and any other devices that react to stop the press, the safety
distance will be too short.
Failure to comply with these instructions will result in death or serious injury.
DANGER
!