Chapter 4 Operating Instructions
C 4000 Standard/Advanced
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Configurable functions
Reset
If you want to activate the restart interlock on the C 4000 (internal) and also a restart inter-
lock on the machine (external), then each restart interlock has its own button.
When actuating the reset button (for the internal restart interlock) …
$ the C 4000 activates the switching outputs.
$ the safety light curtain changes to green.
Only the external restart interlock prevents the machine from restarting. After pressing the
reset button for the C 4000, the operator must also press the restart button for the
machine. If the reset button and the restart button are not pressed in this specified
sequence, the dangerous state remains unchanged.
The reset button prevents the accidental and inadvertent operation of the external restart
button. The operator must first acknowledge the safe state with the reset button.
4.2 External device monitoring (EDM)
The EDM checks if the contactors actually de-energise when the protective device
responds. If you activate external device monitoring, then the C 4000 checks the con-
tactors after each interruption to the light path and prior to machine restart. The EDM can
so identify if one of the contactors has fused, for) instance. In this case …
$ the error message / appears in the 7-segment display.
$ the safety light curtain remains red.
$ with the internal restart interlock activated, the safety light curtain uses the flashing LED
+ Yellow to signal “Reset required”.
If the system is unable to change to a safe operational state (e.g. after contactor failure),
the system locks and shuts down completely (lock-out). The 7-segment display will then
show the error message .
The electrical connection for the external device monitoring is described in chapter
“External device monitoring (EDM)” on page 50.
Device symbol C 4000 receiver, context menu Configuration draft, Edit, file card General,
option EDM.
Recommendation
Note
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