Emerson ELQ 200 - Principles of Operation

TM
5
Installation Operation & Maintenance manual ELQ
DOC.55.EDN Rev: E
October 2012
2 PRINCIPLES OF OPERATION
2.1 Drive principle
2.2.1 Manual operation
2.1.1 Control signal “open”: counter-clockwise rotation, valve
opens.
2.1.2 Control signal “closed”: clockwise rotation, valve closes.
Tooperatethemanualoverrideduringpowerfailure
orsettingusethehandwheel.Youdonotneedto
engageordisengagethemanualoverridebefore
manualoperation.
Note
• Themanualoverridedesignisintendedfor
useinemergencysituationswithoutelectrical
powertotheactuator.
• Ifthehandwheelisturnedwhiletheactua-
torisincontrol,theactuatorwillcompensate
andattempttomovetheactuatortoitsorigi-
nalcommandedposition.
Thehandwheeldoesnotrotateduringpoweropera-
tion.
• Turnthehandwheelclockwisetoclosethevalve.
• Turnthehandwheelcounter-clockwisetoopen
thevalve.
2.2 Manual override