SmartPAC 2 User Manual 1126700
Run Mode 6-23
The ANSI B11.1 safety distance formula, which is recommended by Wintriss, is
D
s
= K x (T
s
+ T
c
+ T
r
+ T
bm
) + D
pf
where
D
s
is the ANSI safety distance in inches
K is the OSHA-recommended hand-speed constant of 63 inches-per-second
T
s
is the
stopping time
of the press in seconds
T
c
is the response time of the press control
T
r
is the response time of the light curtain
T
bm
is additional stopping time to compensate for brake wear
D
pf
is the depth penetration factor
The hand-speed constant K indicates how far an individual could theoretically move his/her
hand and arm in one second.
Ts, Tc, and Tr are the worst-case response times of the press, of the control, and of the light
curtain. The response time of the press, Ts, is measured at approximately 90° of crankshaft
rotation or at maximum closing velocity. The response time of the control, Tc, is the time it
takes for the control to activate the machine’s brake. In the 90° stop-time test used by
SmartPAC 2, the calculated stop time includes both Ts and Tc values.
Response time, Tr, for Shadow light curtains is shown in Table 6-2.
USE BRAKE MONITOR TO CHECK STOPPING TIME
Use a brake monitor in light curtain applications to protect operators whose hands are routinely
exposed to a hazardous area, as required by OSHA 1910.217 (c) (3) (5). A brake monitor
continually checks that the machine’s stopping time does not exceed a predetermined limit.
Failure to comply with these instructions will result in death or serious injury.
Table 6-2. Shadow Light Curtain Response Time and Object Sensitivity
Shadow Model Head Length * Response Time Object Sensitivity
Shadow V 12 in. to 24 in. 30 mS
1.25 in.
36 in. and 48 in. 50 mS
Shadow VI 6 in. to 24 in. 30 mS
1.25 in.30 in. to 48 in. 35 mS
60 in. 40 mS
Shadow VII 6 in. to 30 in. 20 mS
1.18 in.
36 in. to 59 in. 23 mS
Up to 96 in. 28 mS
Up to 135 in. 32 mS
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