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Installation and Operation Manual
3.3.
Timing diagrams
3.3.1. General timing diagram
Driving
release
Latch In
Option 2
Override
delay
Flush position
Safety circuit
Latch Out
active
Protection field
inactive
Active: Light curtain interruption causes an emergency stop
Inactive: Light curtain interruption has no effect
Figure 2: General timing diagram
A change of status of one of these two signals during a journey does not influence the system function. Light
curtain overriding only occurs if both signals are low.
A change of status of this signal during a journey does not influence the system function. It is used to test the
safety circuit when the latch has dropped out. The following three versions are possible:
1. The output relays are automatically tested 5 seconds after Latch_In (Riegel_In) drops out if the input
remains broken. The test is carried out immediately if a travel command occurs during this time pe-
riod.
2. The output relays are automatically tested 10 seconds after Latch_In (Riegel_In) drops out if the in-
put is under a permanent voltage of > 12 VAC / DC. The test is carried out immediately if a travel
command occurs during this time period.
3. A test is carried out if the input is high in the neutral status (> 12 VAC / DC) and receives a negative
edge when Latch_In (Riegel_In) has dropped out. The timing of breaking the safety circuit can thus
be specified by the elevator controller (e.g. at flush position).
© CEDES/August 2013
Zone OFF
Drive
1
1
3
3
www.cedes.com
Zone ON
Slow
Stop
2
cegard/Lift LX/LY
Drive
Zone OFF
Driving
release
1
1
7
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