Wintriss SmartPAC 2, User Manual

Page: 333 / 604

SmartPAC 2 with WPC 2000 Integration User Manual 1128600
Run Mode 6-25
The ANSI B11.1 safety distance formula, which is recommended by Wintriss, is
Ds = K x (Ts + Tc + Tr + Tbm) + Dpf
where
Ds is the ANSI safety distance in inches
K is the OSHA-recommended hand-speed constant of 63 inches-per-second
Ts is the stopping time of the press in seconds
Tc is the response time of the press control
Tr is the response time of the light curtain
Tbm is additional stopping time to compensate for brake wear
Dpf 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 (see page 6-22), 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
DANGER
!