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Operating Instructions
Chapter
3
C 4000
14
©
SICK AG • Safety Systems • Germany • All rights reserved
8 009 221/16-11-00
Product description
The machine-internal restart interlock prevents the machine from restarting. This is why the
button of the internal restart interlock only fulfills the reset function in this configuration
and is called Reset Button.
After activating the reset button, the user must also press the restart button. If the reset
button and the restart button are not pressed in this specified sequence, the dangerous
status remains unchanged.
Recommendation
The reset button prevents the accidental and inadvertent operation of the restart button.
The user must first acknowledge the dangerous state with the reset button.
The electrical connection of the reset button is described in chapter “Reset button/restart
button” on page 34.
3.4.2
External device monitoring (EDM)
The EDM function controls the contact elements (if used) activated by both of the device out-
puts (e.g. external contacts). The machine must be allowed to restart only if both contactors
have been opened.
The C 4000 controls the contactors after every disruption of the light path and before the
machine restart. The EDM can so identify if one of the contactors has fused, for instance.
In this case
·
the error message appears
8
(in the 7-segment display)
·
the safety light curtain changes to red
·
with the internal restart interlock activated, the safety light curtain signals by flashing yel-
low LED
[
“Reset required”
Note
If the system is unable to change to a safe operational state (e.g. after contactor failure),
the system interlocks and shuts down completely (“Lock-out”). The 7-segment display will
then show the error message
(
.
The electrical connection of the EDM is described in chapter “System connection
M26×11 + FE” on page 30.
n
Device symbol
C 4000 receiver
, context menu
Configuration draft
,
Edit
, file card
General
,
option
EMD
3.4.3
Beam coding
If several safety light curtains operate in close proximity to each other, the sender beams
of one system may interfere with the receiver of the other system. With code 1 or 2
activated, the receiver distinguishes the beams destined for it from other beams. The fol-
lowing settings are available: non-coded, code 1 and code 2.
WARNING
Use different beam codings if the systems are located close to each other!
Systems mounted in close proximity to each other must be operated with different beam
codings (non-coded, code 1 or code 2). If this precaution is neglected, the system may be
impaired in its protective function by the beams from the neighbouring system and so
change to the unsafe state. This would mean that the user/operator is at risk.