S
Safety-Rated Device
A device that is designed to an applicable safety standard and when
properly applied, reduces the level of risk.
Self-Checking (Circuitry)
A circuit with the capability to electronically verify that all of its own
critical
circuit components, along with their redundant backups, are
operating
properly. Banner safety light screen systems and safety
modules are self-checking.
Separation
Distance (Safety Light Screen)
The minimum distance required to allow the machine’s hazardous
motion
to stop completely, before a hand (or other object) can reach the
nearest hazard point. Measured from the midpoint of the
defined
area to
the nearest hazard point. Factors that
influence
minimum
separation
distance include the machine stop
time,
the light screen system response
time,
and the light screen minimum object
detection
size.
Simultaneous
The
setting
that permits a signal disparity between channels within the
input device for a limited
time,
without going into a fault
condition.
If a
signal disparity exists for more than 3 seconds, then a fault
condition
occurs.
Single-Channel
Having only one signal line for a safety input or safety output.
Specified
Test Piece
An opaque object of
sufficient
size used to block a light beam to test the
operation
of a safety light screen system. When inserted into any part of
the
defined
area, it will place a system into a Trip or Latch
condition.
Banner supplies
specified
test pieces with each system. See also
Minimum Object
Sensitivity
.
Start Up Test
For certain safety devices, like safety light screens or safety gates, it can
be an advantage to test the device on power up at least one
time
for
proper
function.
If ‘Start up Test’ has been selected for a safety light
screen and the light screen is clear at power up, it would be necessary to
cycle the light screen one
time
(from On to
Off
and back to On), even if
the Controller has been
configured
for auto power up.
Supplemental Guarding
Additional
safeguarding device(s) or hard guarding, used to prevent a
person from reaching over, under, through or around the primary
safeguard or otherwise accessing the guarded hazard.
Stop Signal
The input signal monitored by the Controller that, when detected, causes
one or more safety outputs to turn
Off.
In this manual, either the input
device or device signal is said to be in the Stop state.
System Reset
A
configurable
reset of one or more safety outputs to turn On
after
Controller power-up, when set for manual power-up, or lockout (fault
detection)
situations.
T
Test Piece
An opaque object of
sufficient
size used to block a light beam to test the
operation
of a safety light screen system.
Trip
Condition
The response of the safety outputs (for example, OSSDs) of a safety light
screen system when an object equal to or greater than the diameter of
the
specified
test piece enters the
defined
area. In a Trip
condition,
the
OSSDs simultaneously de-energize. A Trip
condition
clears (resets)
automatically
when the object is removed from the
defined
area. (See
Latch
Condition
.)
Trip
Initiate
The
resetting
of a safeguard causing the
initiation
of machine
motion
or
operation.
Trip
Initiate
is not allowed as a means to
initiate
a machine
cycle per NFPA 79 and ISO 60204-1, and is commonly confused with PSDI.
U
UL (Underwriters Laboratory)
A third-party
organization
that tests products for compliance with
appropriate standards, electrical codes, and safety codes. Compliance is
indicated by the UL
listing
mark on the product.
EZ-SCREEN
®
Type 2 Light Screen
58
www.bannerengineering.com - Tel: 763.544.3164