Rockford Fosgate SSC-500 Installation Manual page 22

SECTION 3 — INSTALLATION OF COMPONENTS
SSC-500 Hydraulic Press Solid-State Control
Other Required Components
PRESENCE SENSING DEVICE
According to ANSI B11.2 - 1995, the total stopping time of the press (for presence sensing devices) should include the total response time of
the presence sensing device, as stated by the manufacturer, the response time of the interface, the response time of the control system and the
time it takes the press to cease slide motion. The following formula should be used when calculating the safety distance:
D s = K (T s + T c + T r + T spm ) + D pf where:
K = the hand speed constant = 63 inches/second.
T s = the stop time of the press measured from the
final deenergized control element
T c = the response time of the press control
Note: T s + T c are usually measured by a portable or built-in
stop-time measuring device.
T r = response time of the presence sensing device and its
interface, if any, as stated by the manufacturer or measured by the employer
T spm = the additional time allowed for the stopping performance
monitor to compensate for variations in the normal stopping time
D pf = the added distance due to the penetration factor as recommended
in Table 3.1. The minimum object sensitivity is stated by the manufacturer.
If beam blankouts or floating window features are used, these figures should be added to the object sensitivity figure
before using the chart
22
(continued)
Table 3.1
DEPTH PENETRATION FACTOR
This table represents the depth of penetration into the
light curtain at which an object will be detected.
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0 1 2 3
Penetration Factor D pf In Inches
4 5 6 7 8
(Continued on next page.)
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