Honeywell SmartPAC 2 User Manual page 450

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Excerpts from OSHA Regulation 1910.217
OSHA Regulations
OSHA 1910.217 (c) (3) (iii)
(iii) A presence-sensing point of operation
device shall protect the operator as pro-
vided in paragraph (c) (3) (i) (a) of this
section, and shall be interlocked into the
control circuit to prevent or stop slide
motion if the operator's hand or other part
of his body is within the sensing field of
the device during the downstroke of the
press slide.
(a) The device may not be used on
machines using full revolution clutches.
(b) The device may not be used as a
tripping means to initiate slide motion.
(c) The device shall be constructed so
that a failure within the system does not
prevent the normal stopping action from
being applied to the press when required,
but does prevent the initiation of a
successive stroke until the failure is
corrected. The failure shall be indicated
by the system.
(d) Muting (bypassing of the protective
function) of such device, during the
upstroke of the press slide is permitted for
the purpose of parts ejection, circuit
checking and feeding.
(e) The safety distance (D s) from the
sensing field to the point of operation
shall be greater than the distance
determined by the following formula:
D s = 63 inches/second x T s where
D s = minimum safety distance (inches);
63 inches/second = hand speed constant
page 428 Appendix A Excerpts from OSHA Regulations and ANSI Standards
SmartPAC 2 with WPC Integration
PMA Interpretation
European method (curtain of light) uses self trip safety
system effectively. Variance applied for 11/17/73 by
Interlake Stamping Company to use this fail safe
system.
When failure occurs, the best indication is the press
won't run.
Top of stroke is the point at which muting shall cease
as it is not possible to set a point on the downstroke as
the exact position where the hazard of die closing
starts.
Safety distance represents the distance an operator can
move his hand during the time it takes a press to stop.
The internationally recognized hand reach speed is 63
inches/second.
To determine this safety distance, the stopping time of
the press is measured with some appropriate
measuring device. The measurement is taken such that
the stop signal is given to the press at the 90 degree
point of the crank position.
Since some stopping time increase must be
accommodated due to braking system deterioration, a