SICK PBS Series

Operating Instructions PBS
38 ©SICKAG•Germany•Allrightsreserved•Subjecttochangewithoutnotice8013154/U275/2010/02/01
7. Starting, operation
Switch function
Hysteresis function
Ifthesystempressureuctuatesaroundthenominalvalue,the
hysteresis keeps the switch status of the outputs stable. When the
system pressure is rising, the output switches when it reaches the
respectivesetpoint(SP);ifthepressurefallsagain,theoutputswit-
ches back only if the reset point (RP) is reached.
Applicationexample:loadinganaccumulator.
Theshut-offvalveloadsupto8obarandthenshutsoff.When70
bar is reached again, it switches on once more.
Window function
Thewindowfunctionallowsthemonitoringofadenedrange.
If the system pressure is between the window high (FH) and the
windowlow(FL),theoutputisactivated(NO)respective
deactivated(NC).
Delay times (0.00 to 50 s):
By this means unwanted pressure peaks of short duration or high
frequencycanbelteredout.
The pressure must remain for at least this time to enable the switch
to operate. The switching output does not immediately change its
statuswhenitreachestheswitchingevent,butonlyafterthedelay
timehaselapsed.Iftheswitchingeventnolongerpertainswhenthe
delay time has elapsed, the switching output does not change.