Shadow VI User Manual
1107200
Installation and Checkout
Chapter 2
page 21
Since some increase in stop time can invariably be anticipated due to clutch/brake system
deterioration, a percentage factor must also be added to the actual measured stop time of your
press when determining your safety distance.
A percentage factor of 20 percent is recommended for presses with new brakes or brakes in
good condition; a percentage factor of 10 percent is recommended for presses with older
brakes. This is because the stopping time for older brakes will be longer due to wear.
Therefore, you add less time for older brakes.
An example of calculating the safety distance using the OSHA formula
The OSHA formula for finding safety distance is:
Ds = 63 inches/sec. x Ts
We will use a stop time of .190 seconds for this example. This includes reaction time of all devices
noted above in signaling the press to stop
except the response time of the light curtain.
Next we will
add in Shadow VI response time and the braking percentage factor. Let's say our brakes are new.
Then we will add 20% additional time to the stop time measurement (.20 x .190 = .038). We also add
response time of the 60” Shadow VI (.040 seconds). Then:
Ts = .190 sec. + .038 sec +
.040 sec.
(braking factor)
(Shadow VI response time)
Ts = .268
Now, we will calculate safety distance:
Ds = 63 in/sec x Ts
Ds = 63 x .268
Ds = 16.88 in.
Shadow VI heads must be mounted more than 16.88 inches from the hazardous area using the
OSHA formula.
The ANSI Safety Distance Formula
DANGER
!
INCORRECT SAFETY DISTANCE
•
Calculate the safety distance carefully according to the instructions below, and mount your
light curtain heads at least this distance from the hazardous area.
•
Mount your light curtain heads at least 7.5” (191 mm) from the hazardous area, regardless
of the calculated safety distance.
•
Be sure your value for Ts includes the response times of all devices that react to stop the
press. If your measurement of stop time does not include response time 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.
Содержание Shadow VI
Страница 142: ...1107200 Shadow VI User Manual page 130 Appendix C Installation of Shadow VI WPC Control Board ...
Страница 144: ...1107200 Shadow VI User Manual page 132 Appendix D Replacement Parts ...
Страница 150: ......
Страница 151: ......
Страница 152: ......
Страница 153: ......
Страница 154: ......
Страница 155: ......
Страница 156: ......
Страница 157: ......
Страница 158: ......
Страница 159: ......