Wintriss SmartPAC 2, User Manual

Page: 336 / 604

1128600 SmartPAC 2 with WPC 2000 Integration User Manual
6-28 Run Mode
The OSHA safety distance formula as specified in OSHA regulation 1910.217 is
Ds = K x Ts
where
Ds is the OSHA 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
The stopping time, Ts , 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 6-25).
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 6-22).
The Ts value should also include a percentage factor added for brake wear. A factor of 20
percent is recommended for presses with new brakes or brakes in good condition. A factor of
10 percent is recommended for presses with older brakes. See
Calculating the Stop-time
Limit
, page 4-31 for further details.
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.
Wintriss recommends that you use the American National Standards Institute (ANSI) formula for
calculating safety distance because it contains more factors, allowing you to calculate the safety
distance more precisely. The ANSI formula is explained in the previous section (see page 6-24).
OSHA SAFETY DISTANCE FORMULA FOR USE WITH TWO-HAND CONTROL
The formula for safety distance when using a Two-hand Control as a safeguarding device is similar
to the formula above, but does not include the response time of the light curtain. Use the following
OSHA formula for calculating the safety distance for a Two-hand Control:
Ds = K x Ts
As indicated above, Ts must include all factors that are involved in stopping the press, including
the response time of the press control but excluding the response time of the light curtain.
DANGER
!
NOTICE
NOTICE