The overload cut-off is designed according to Performance Level d, Category 2 in
accordance with ISO 13849-1.
As shown in the schematic circuit diagram, the DMS load sensor is supplied with power
(10 VDC) via the connections +S and -S. The load-proportional signal voltage ("load
signal") of the DMS sensor is connected at the connections +IN and -IN (mV).
The overload cut-off switches off in the following cases:
• If the signal voltage between the connections IN+ and IN- exceeds the cut-off thresh-
old setting while S↑ is active, the SLE 3 detects "overload" and switches the outputs
K↑ and K↑↑ off. The outputs are blocked until no overload is detected any more.
• If the signal voltage between the connections IN+ and IN- exceeds the cut-off thresh-
old setting while the outputs K↓ and K↓↓ are active or when stationary, the SLE 3
detects "overload" after a time of 800 ms and blocks the outputs K↑ and K↑↑ until
no overload is detected any more.
As a result of internal filter functions, the maximum response time of the cut-off when
lifting a load from the ground is 500 ms. For the total response time, the elasticity of the
crane system must also be taken into consideration.
"Overload" is acknowledged when the load on the hooks drops below 82.5 % of the
maximum lifting capacity and the safety input S↓ is active for a time of at least 2 seconds.
Switching of the outputs K↓ and K↓↓ is possible when an overload has been
detected!
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