Acting Direction And Flow Characteristic; Position Feedback U - Siemens Acvatix SAX Series Basic Documentation

Siemens
Building Technologies
4.5

Acting direction and flow characteristic

The selection of changeover of acting direction and characteristic with the DIL
switches of the function module AZX61.1 depends on the type of actuator (with or
without fail safe function) and the associated type of valve (valve characteristic,
push to open, pull to open).
When the positioning signal increases (DC 0...10 V, DC 4...20 mA, 0...1000 Ω), the
objective is to have the valve's volumetric flow V rising, but to fully open the valve,
V = 100% (NO = normally open), or to fully close it, V = 0% (NC = normally closed)
in the event of a power failure.
Acting
direction
DIL
switches
Flow
characteristic
Without fail
No power
safe
applied
function
4.6

Position Feedback U

The position feedback U (DC 0...10 V) is always proportional to stroke H of the
actuator's stem.
log = equal-
percentage
lin = linear
Actuators SAX.., SAY.., SAV.., SAL.. for valves
Functions and control
Direct
Equal-
Linear
percentage
Maintains the position
Actuator
Positioning signal Y, Z
Reverse
Equal-
Linear
percentage
Actuator
Position feedback U
61 / 92
CE1P4040en
2018-12-05