Rockwell Automation 1000 Safety Lockout System - Manual (Page 8)

Publication 1000-UM001B-US-P - July 2000
Preface 2
Description of Use The SLS switch should not be used to initiate normal stopping of the system.
The normal system stop function(s) should be used to stop the system and
then, when necessary, the remote SLS switch can be used to initiate the
isolation of the system. When the SLS switch is operated for the purpose of
isolation, a white SAFE light will illuminate when the system is isolated. The
illumination of the SAFE light is the control indication that the electrical
power to the equipment on the machine fed through the SLS is de-energized
and isolated.
An SLS service technician must investigate, correct and log any abnormality.
Simplified Wiring Diagram
and Sequence of Operation After using the normal stop function, the machine operator can turn the SLS
switch from the ON to the OFF position and then lock the SLS switch in the
OFF position. This will cause the isolation contactor (IC) to drop out and arm
the SAFE pilot light. The voltage supervision relay (VSR) will then monitor
the load side of the isolation contactor for voltages greater than 10V and will
monitor the position of the isolation contactor through its normally closed
positively guided auxiliary contact. If the voltage check is OK and the IC
auxiliary contact is closed, the VSR’s safety contacts will close, illuminating the
SAFE pilot light.