User Manual

Publication 1000-UM001B-US-P - July 2000
Preface 2
Description of Use
Th e SLS swit ch shou ld not be us ed to initi ate norma l stop ping of the syste m.
Th e norma l syst em stop f unc tio n(s ) should be used to stop the syst em and
then, wh en necessary, the remot e SLS switch can be used to initiate the
isolation of the system. When the SLS switch is operated for the purpose of
isolation, a whit e SAFE light will illuminate wh en the system is isolated. The
illumina tion of the SAFE ligh t is the contr ol indication that the electrical
power to the equipment on the machine fed through the SLS is de-energized
and iso lated.
An SLS service technician must investigate, correct and log any abnormalit y.
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 posit ion and then lock the SLS switch in the
OFF position. This will cause the isolation contactor (IC) to drop out and arm
the S A FE pilot light. The voltage su pe rvision r elay (VSR) wil l then moni tor
the load side of the isolation contactor for voltages greater than 10V and will
mo ni tor the pos ition of the isolatio n cont act or th rough its no rma lly 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.