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T
H E O R Y
O F
O
P E R A T I O N
Safety Outputs (OSSD’s)
7
Safety Edge Controllers Manual 99640-0010 Rev.P
Original Instructions
3 T
HEORY
OF
O
PERATION
The Safety Edge Controller and Safety Edge combine to make up a
versatile and flexible emergency stop system for use in applications
where a machine operator or setup person must have easy, contiguous
access to an E-Stop actuator.
The Safety Edge is consists of an aluminum mounting rail, a Safety
Contact and a rubber profile into which the Safety Contact is inserted.
The SGE Series Edges have an integrated contact within the profile.
The Safety Edge has two wires connected at each end. In an
application where a single strip is used, two wires from one end are
connected to the Safety Edge Controller, the two wires on the other
end of the Safety Edge are factory connected to an 8.2 K Ohm resistor.
4 D
ESCRIPTION
OF
C
ONTROL
4.1. S
AFETY
O
UTPUTS
(OSSD’
S
)
The positive-guided relay outputs of the SCC-1224 and SCC-1224ND
are referred to as safety outputs. They are turned off when an object or
person activates the Safety Edge. Two Normally Open contacts are
provided across terminals 13, 14 and 23, 24.
4.2. A
UXILIARY
O
UTPUT
SCC-1224
One Normally Open contact is provided across terminals 31, 32. This
contact closes for 1 to 3 seconds whenever the Safety Edge is
activated.
These contacts must never be used in the safety circuit.
4.3. A
UXILIARY
O
UTPUT
SCC-1224ND
One Normally Open contact provided across terminals 31, 32. This
contact remains closed as long as the safety contacts are open. (When
the Safety Edge is activated). These contacts must never be used in the
safety circuit.