Description Of Function; General; Calibration; Interface Of Control Unit Light Curtain - Cedes cegard/Lift LI Mode D'emploi

cegard/Lift LI
The cegard/Lift LI offers the following advantages:
• Simple and space-saving installation
• No adjustments or optical alignment necessary
• Short installation time
• Large operating range and dense protective field
• Automatic start after power-up
• Potential free relay output
• Opto edge protection rating IP65
• Also ideal for controlling automatic doors because of
the additional output
There are also mounting kits available, which enable simple
assembly, installation and implementation by just one fitter.
NOTICE
For older elevators, especially those with a relay
controller, we recommend the CEDES cegard/
Lift LX system, which already contains the above
mentioned safety-related protective circuit:
• EN 61508 SIL 2 and
• EN ISO 13849-1 Cat. 2 / PL d
and can be directly integrated into the elevator
controller.
5.

Description of function

5.1

General

The accident prevention light curtain cegard/Lift LI
operates according to the principle of a through-beam
sensor. The monitoring is carried out using pulsed infrared
light. It consists of a transmitter edge, which sends out
many individual infrared beams. These light beams are
received by the receiver edge, are converted into electrical
signals and are transmitted to the control unit light curtain.
An interruption of a light beam is then communicated to its
outputs (Figure 1).
Control unit light curtain
Figure 1:
Schematic layout
4
5.2

Calibration

In order to generate only as much emitted light as necessary,
the control unit light curtain performs a calibration. During
the calibration, the controller unit measures how much
emitter power is required for every individual light beam to
trigger the corresponding receiver. This calibration prevents
the notorious reflection of through-beam sensor systems as
far as possible and replaces the usual process of grouping
the optical aperture angle near other light curtains. This
substantially simplifies installation and alignment of the
door edges.
The calibration process lasts between 0.5 and 2 s,
depending on the distance between the emitter and
receiver edges. The calibration is performed at power-up
and by pressing the "T" button on the control unit light
curtain. If no changes occur in the monitored area over
a period of 30 min, i.e. the elevator is at a standstill, the
elevator controller carries out a calibration automatically.
Large variations of illumination e.g. because of cleaning
etc. are detected within 3 s and recalibrated.
5.3

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
English
GND
+24 V
WK
RK
AK
SigIn
Status
SigOut
© CEDES | V 2.7