Input Signal - Samson 3374-10 Mounting And Operating Instructions

9.2 Input signal

The input signal determines the actuator stem position. Either a current or voltage signal can
be applied to the input depending on the configuration in Code c01. The default lower and
upper range values of the input signal are 2 to 10 V or 4 to 20 mA. The input signal range
can be adapted, e.g. to achieve a plant operation characteristic by connecting two or more
actuators in parallel (split-range operation).
Note
The input signal must be ≥0.5 V or ≥1 mA.
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 first valve remains open.
The two valves close in the reverse order.
Note
At least 2.5 V or 5 mA (depending on the input signal used) must separate the upper and
lower range values.
Code Description
c01 Source (depending on the selected
application)
c02 Lower range value
c03 Upper range value
Detect input signal failure
The actuator detects a configured 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:
EB 8331-4 EN
WE Adjustment range
mA mA (current signal)
V (voltage signal)
C (Pt-1000)
VIA (via interface)
2.0 V or 0.0 to 7.5 V or 0.0 to
4.0 mA 15.0 mA
10.0 V or 2.5 to 10.0 V or
20.0 mA 5.0 to 20.0 mA
Configuration level
51