3
Product and functional description
09.2019
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3.6.2
Sensor errors
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.
WARNING
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!
3.7
Control and monitoring functions
3.7.1
Actuation
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.
