1128600
SmartPAC 2 with WPC 2000 Integration User Manual
6-26
Run Mode
* Includes extensions/cascaded heads for Shadow VII, Shadow 8, and Shadow 9 models
Tbm
is time added to the other response times in the ANSI formula to reflect brake wear. It is
calculated as follows:
Tbm = stop-time limit – stopping time at top stop
The Stop-time Limit is calculated in Initialization (see page 4-31). You can determine the
stopping time at top stop by performing the stop-time test procedure shown on page 6-21.
The depth penetration factor
Dpf
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 light
curtain’s object sensitivity, the smallest diameter object the light curtain can detect anywhere
in its field.
Object sensitivity (
S
) for Shadow 8 is 1.18 in. (30 mm) with beam centers of 0.79 in. (20 mm).
(See Table 6-2 for the object sensitivity of other Shadow models.) Based on S and ANSI
B11.1-2009,
Dpf
= 3.07 in. (78 mm).
Shadow 8
Up to 42 in.
23 mS
1.18 in.
Up to 85 in.
32 mS
Up to 128 in.
41 mS
Up to 171 in.
50 mS
Up to 202 in.
59 mS
Shadow 9
Standalone up to 31.5 in.
(800 mm)
8 mS
1.18 in.
Standalone greater than
31.5 in. (800 mm)
13 mS
Cascaded up to 110 in.
(2800 mm) combined
13 mS
Cascaded greater than
110 in. (2800 mm)
combined
18 mS
ANSI SAFETY DISTANCE FORMULA FOR USE WITH TWO-HAND CONTROL
The formula for safety distance when using a Two-hand Control as a safeguarding device is similar
to the formula above, but does not include the response time of the light curtain nor the depth
penetration factor. The following is the ANSI formula for calculating the safety distance for use
with Two-hand controls:
Ds = K x (Ts + Tc + Tbm)
If you use a Two-hand Control as a safeguarding device, use this formula and perform the
calculation in a fashion similar to that described for the light curtain formula.
Table 6-2. Shadow Light Curtain Response Time and Object Sensitivity (Cont.)
Shadow Model
Head Length *
Response Time
Object Sensitivity
NOTICE
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