Interface Of Control Unit Light Curtain; Alignment; Reflection - Cedes cegard/Lift LI Installation And Operation Manual

cegard/Lift LI
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.
control unit
light curtain
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 of surveillance area, independent of signal
Status
"SigIn", semiconductor output
Status of surveillance area, dependent of signal
SigOut
"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.
4
Installation and Operation Manual
3.4.
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).
GND
+24 V
WK
RK
AK
SigIn
Status
SigOut
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.
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).
E
Figure 4: Reflection
www.cedes.com

Alignment

S

Reflection

Reflective surface
Min. 5 cm
I
optical axis
reflection
E
40°
R
© CEDES/July 2017