Samson 3374 Series - Page 95

EB 8331-4 EN 16-3
Annex A (conguration instructions)
Example: Two valves regulate the process medium in one common pipeline to achieve a
largerangeability.Onevalveopenswitha0to5Vinputsignal,whilethesecondvalvealso
openswhentheinputsignalincreasesfurther(5to10V)andtherstvalveremainsopen.
The two valves close in the reverse order.
At least 2.5V or 5mA (depending on the input signal used) must separate the upper and
lower range values.
Code Description Default Adjustment range
c01 Source (depending on the selected applica-
tion)
mA mA (current signal)
V (voltage signal)
C (Pt 1000)
VIA (via interface)
c02 Lower range value 2.0Vor
4.0mA
0.0to7.5Vor0.0to
15.0mA
c03 Upper range value 10.0Vor
20.0mA
2.5to10.0Vor
5.0to20.0mA
Detect input signal failure
TheactuatordetectsaconguredfailureoftheinputsignalandtheerrorreadingE01 starts
toblinkonthedisplayassoonastheinputsignalfallsbelowthelowerrangevalueby0.3V
or0.6mA.Iftheinputsignalfailurefunctionisactive(c31=YES),thereactionoftheactua-
toruponfailureoftheinputsignalisdeterminedbyCodec32:
− Internal positioning value (c32 = INT):Theactuatorstemmovestothepositionspecied
in Code c33 upon failure of the input signal.
− Last position (c32 = LAST): The actuator stem remains in the last position that the valve
moved to before failure of the input signal.
The error message is reset and the actuator returns to closed-loop operation if the input sig-
nalmoveswithin0.2Vor0.4mAofthelowerrangevalue.
Code Description Default Adjustment range
c31 Detect input signal failure NO NO (function inactive)
YES (function active)
c32 Positioning value upon input signal
failure
INT INT (internal positioning value)
LAST (last position)
c33 Internal positioning value 0.0% 0.0to100.0%
Note