cegard/Lift LI
Installation and Operation Manual
4
www.cedes.com
© CEDES/July 2017
3.3.
Interface of Control unit light curtain
The connections WK, RK and AK are galvanically
separated relay contacts. The supply voltage as well
as
SigIn
,
Status
and
SigOut
are not galvanically
separated.
Figure 2: Interface connections
Description of the interfaces
Label
Description
GND
Negative power supply connection
(0 V = direct current, DC)
+24 V
Positive power supply connection
(24 V = direct current, DC)
WK
Common contact
RK
NC output. Status is in idle, respectively monitored
area interrupted or "SigIn" = 0 V connected with the
WK connection
AK
NO output. In operation and monitored area free /
uninterrupted, connected with the WK connection
SigIn
Test input for the testing of the system
Status
Status of surveillance area, independent of signal
"
SigIn
", semiconductor output
SigOut
Status of surveillance area, dependent of signal
"
SigIn
", (analogue relay output)
Information regarding the signal processes, see ch. 5
Electrical data of the interfaces, see chapter 10
The control unit light curtain must be earthed / grounded!
Important safety notice:
Overcurrent protection shall be provided according to
IEC 60204-1:2009, 7.2.1, 7.2.3, 7.2.7, 7.2.8 and
7.2.9.
The electrical equipment shall be wired according to
IEC 60204-1:2009.
3.4.
Alignment
For cegard/Lift LI, no alignment is necessary as long
as the receiver elements are located within the
aperture angle of the emitter edge and vice versa
(figure 3).
Figure 3: Aperture angle and beam cross section
This simplifies the installation as the door edges do
not need to be especially aligned with one another.
3.5.
Reflection
Reflections occur if there is a reflective surface
parallel or near the monitored area e.g. a tiled shaft
wall (figure 4). The reflection is eliminated for the
most part by
calibration
, use of the CEDES
mounting kits
and
observance of the minimum
distances. The optical axis must be
at least
5 cm
away
from the shaft wall (see also chapter 12).
Figure 4: Reflection
Emitter
ed
ge
Receiv
er
ed
ge
control unit
light curtain
GND
+24 V
WK
RK
AK
SigIn
Status
SigOut
40
°
W
5
mm
S
E
reflection
E
R
optical axis
I
Reflective surface
Min. 5 cm
