1139300
Shadow 8 User Manual
1-8
Introduction
Shadow 8 is “control reliable” as defined by OSHA and ANSI. A control-reliable device must
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” (OSHA 1910.217 (c) (3) (iii) (c)).
All critical components in Shadow 8 are duplicated so that if one component fails, its
duplicate will still allow the guarded machinery to be stopped. When a component failure
occurs, Shadow 8 immediately detects it and sends a stop signal to the machinery. The light
curtain will not allow equipment to resume operation until repairs are made to the failed
component.
The Shadow 8 receiver has two solid-state PNP safety outputs that source 24 Vdc when the
sensing field is unobstructed. When an obstruction enters the field, Shadow’s circuitry
instantly de-energizes the outputs. Safety outputs must be wired to either the optional Shadow
8 control or to a new WPC.
The Shadow 8 control has two cross-checked “captive contact” safety relays, one N/O
(Normally Open), the other either N/O or N/C (Normally Closed). When an obstruction
enters the field, Shadow’s control circuitry instantly de-energizes the relays, which results in
opening the contacts and breaking the stop circuit of the press.
The new WPC clutch/brake control also has two “captive-contact” N/O safety relays. When
an obstruction enters the sensing field while the machine is energized, WPC instantly
de-energizes its relays, stopping the press.
Shadow 8’s response time from loss of light to relay contacts open (or de-energized) is 23 to
59 milliseconds, depending on configuration (see Table 1-1, page 1-13). Even if one of
Shadow’s control relay contacts fails closed (i.e., the contact welds shut), the second relay
will still de-energize and a stop signal will be sent to the machinery. Shadow 8 will also
detect the failed relay and will not allow further press operation until the relay is replaced (see
Checking and Replacing Control Relays in Optional Shadow 8 Control Box, page 4-9)
UNPROTECTED EQUIPMENT MAY CONTINUE TO OPERATE AFTER GUARDED PRESS
STOPS
Ensure that all operators know which device(s) are protected by your Shadow safety light curtains
and which are not. Though a protected press will stop when the Shadow light curtain is
interrupted, associated feeds and conveyors not protected by Shadow will continue to operate
after the press stops.
Failure to comply with these instructions could result in death or serious injury.
OSHA and ANSI have issued regulations for the use of presence-sensing devices such as
Shadows. Both organizations require control reliability. See Appendix D for more information.
WARNING
!
NOTICE
Содержание Shadow 8
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