SmartPAC 2 User Manual 1126700
Run Mode 6-25
When using the ANSI safety distance formula, be sure to perform calculations in the following
order:
(1) Add T
s
+ T
c
+ T
r
+ T
bm
first.
(2) Multiply the result by 63.
(3) Add this result to D
pf
. This is D
s
.
If you do no follow this order, your safety distance calculation will be incorrect.
The OSHA Safety Distance Formula
The OSHA safety distance formula as specified in OSHA regulation 1910.217 is
D
s
= K x T
s
where
D
s
is the OSHA 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
The stopping time, T
s
, must be measured at approximately 90° of crankshaft rotation or at
maximum closing velocity and include all components involved in stopping the press,
including the response time of the press control that activates the brake and the response time
of the light curtain (see Table 6-2, page 6-23).
The value calculated by SmartPAC 2 at the end of the 90° stop time test includes the stop time
of the press and response time of the press control (see page 6-20).
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 T
s
(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.
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 to make sure 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.
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