Programmable Safety Controller SCR P
www.bernstein.eu
- Tel: + 49 571 793 0
195
Off Signal
The safety output signal that results when at least one of its
associated input device signals changes to the Stop state. In this
manual, the safety output is said to be Off or in the Off state
when the signal is 0 V dc nominally.
On Signal
The safety output signal that results when all of its associated
input device signals change to the Run state. In this manual, the
safety output is said to be On or in the On state when the signal
is 24 V dc nominally.
Open-Closed Debounce Time
Time to bridge a jittery input signal or bouncing of input contacts
to prevent unwanted start of the machine. Adjustable from 10 ms
to 500 ms. The default value is 50 ms.
Pass-Through Hazard
A pass-through hazard is associated with applications where
personnel may pass through a safeguard (which issues a stop
command to remove the hazard), and then continues into the
guarded area, such as in perimeter guarding. Subsequently, their
presence is no longer detected, and the related danger becomes
the unexpected start or restart of the machine while personnel
are within the guarded area.
PELV
Protected extra-low voltage power supply, for circuits with earth
ground. Per IEC 61140: "A PELV system is an electrical system
in which the voltage cannot exceed ELV (25 V ac rms or 60 V
ripple free dc) under normal conditions, and under single-fault
conditions, except earth faults in other circuits."
Qualified Person
A person who, by possession of a recognized degree or certificate
of professional training, or who, by extensive knowledge, training
and experience, has successfully demonstrated the ability to solve
problems relating to the subject matter and work.
Run Signal
The input signal monitored by the Controller that, when detected,
causes one or more safety outputs to turn On, if their other
associated input signals are also in the Run state.
SELV
Separated or safety extra-low voltage power supply, for circuits
without earth ground. Per IEC 61140: "A SELV system is an
electrical system in which the voltage cannot exceed ELV (25 V
ac rms or 60 V ripple free dc) under normal conditions, and under
single-fault conditions, including earth faults in other circuits."
Simultaneous (also Simultaneity)
The setting in which both channels must be off at the same time
AND, when they turn back on, they must turn on within 3 seconds
of each other. If both conditions are not satisfied, the input will be
in a fault condition.
Single-Channel
Having only one signal line for a safety input or safety output.
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.
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.
O
P
Q
S
R
