The load signal (+IN/-IN) from the DMS sensor is processed internally in the SLE 3 on
two channels and monitored permanently.
The following three types of sensor errors are detected
• broken cable
• short circuit
• differential error between the internal measuring amplifiers in the device – internal
error.
NOTICE
See chapter "Error messages" on error diagnosis and correction.
In all three cases of sensor errors the output relays K↑ and K↑↑ are switched off in
dependence on the actuation of the safety inputs S↑ and S↕↕ and indicated as error
code by the device LEDs.
The maximum response time for cut-off of the outputs is:
▪ when input S↑ active = 850 ms
▪ when input S↑ not active = 1950 ms
A sensor error is acknowledged when:
• the cause of the error no longer exists
and
• the sensor signal is within the function limits and
• lift S↑ is not actuated.
It remains possible to carry out the downwards movement (switching of the out-
puts K↓ and K↓↓) in the case of an overload or sensor error so that a suspended
load can be put down if necessary!
The safety inputs S↑, S↓ and the input S↕↕ are read in in relation to N.
S↑ and S↓ are kept in the device on two channels in both controllers and evaluated
according to Category 2 Performance Level d.
Actuation of S↕↕ is only recognised if the corresponding direction S↑ or S↓ is active at
the same time.
If S↑ or S↓ is actuated from idle state, the SLE 3 switches the respective safety output
K↑ or K↓ after a maximum delay time of 300 ms.
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