Rockwell Automation 442L SC300 Safety Sensor User Manual - Manual (Page 13)

Rockwell Automation Publication 10000202762 Ver 00 - January 2012 11
Chapter 3 Product description
Restart interlock
Figure 6 - Outline drawing of the protective operation
The SC300 has an internal restart interlock. The dangerous state of the machine ( Œ) is
interrupted on a protective field interruption (
), and is not re-enabled (Ž)until the
operator presses the reset button.
Notes • If you use the SC300 without internal restart interlock, then you must implement the
restart interlock externally, i.e. machine-side.
• Do not confuse the restart interlock with the starting interlock on the machine. The
starting interlock guards against the machine starting after switching on. The restart
interlock guards against the machine starting again after an error or an interruption of
the light path.
When using the SC300, you can implement the restart interlock in two different ways:
• With the internal restart interlock of the SC300:
The SC300 controls the restart.
• With the restart interlock of the machine (external):
The SC300 has no control over the restart.
The possible combinations are shown in the following table:
Table 2 - Permissible restart interlock configurations on the SC300
ATTENTION
Test the protective device after any changes.
After each modification to the protective device or its
connection, you must check the whole protective device for
effectiveness (see “Test Notes” on page 38).
Restart interlock
of the SC300
Restart interlock
of the machine Permissible application
Deactivated Deactivated
Only if …
the safety camera system cannot be stood behind. Observe EN 60
204­1!
it is ensured no work clothing with reflectors is used.
Deactivated Activated All
Activated Deactivated
Only if the safety camera system cannot be stood behind. Observe
EN 60
204­1!
Activated Activated All. Restart interlock of the SC300 handles the reset function (see Reset below).
Always configure the application with restart interlock.
Ensure that there is always a restart interlock. The SC300 is
unable to verify if the restart interlock of the machine is
connected. If you deactivate both the internal and the external
restart interlock, the users and operators of the machine will be
at acute risk of injury.
ATTENTION