Wintriss WPC 1000, User Manual

Page: 121 / 235

1125100 WPC 1000 User Manual
3-22 Initialization, Setup, and Checkout
ANSI Safety Distance Formula
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 the additional stopping time of the press allowed by the brake monitor
Dpf is the depth penetration factor
The hand-speed constant indicates how far you could theoretically move your hand and arm in
one second.
The Stopping Time of the press (Ts) is measured at approximately 90° of crankshaft rotation, or
at maximum closing velocity. The response time of the press control (Tc), which is the time it
takes for the control to activate the press’s brake, is included in the result of the 90° stop-time
test run on the WPC 1000 (see Determining the 90° Stop Time, page 3-18). You can use the
value generated by the 90° stop-time test for the variables Ts
+ Tc in the ANSI formula.
Response times Tr for Shadow light curtains are shown in Table 3-4.
* Includes extensions for Shadow VII and Shadow 8 models
Table 3-4. 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
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