EUCHNER FSA Light - Manual (Page 33)

Manual EKS Light and Light FSA
The switching contact LA1/LA2 of the EKS FSA, in series with a switching contact on the enabling switch, is
connected to the first input on the safety relay. The switching contact A100.0 is connected to the second input
on the safety relay in series with the second switching contact on the enabling switch. The result is that these
inputs on the safety relay are only enabled if
 the EKS FSA (switching contact LA1/LA2) and
 the control system (switching contact A100.0) issue the related enabling signal and
 the enabling switch is actuated.
The output contacts on the safety relay are enabled only after actuation of the enabling switch. The safety relay
is de-energized without a time delay (stop category 0) and the machine movement is stopped if
 the Electronic-Key is removed or
 the enabling switch is released or
 the machine control system cancels the enable state (contact A100.0 is opened).
Note: The control system output A100.0 is only allowed to be set
 if the related Electronic-Key is inserted and
 a suitable operating mode is selected.
7.3.1.2 Feedback loop
The safety relay can be started only with the feedback loop closed. A welded contactor contact in the enable
path will thus be detected when a start request is made and a start is then prevented. The power contactor must
have positively driven contacts.
7.3.1.3 Start
The safety relay start takes place after enabling by the EKS FSA and by the control system, and after operation
of the enabling switch.
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