Operation; Positioners - Samson 3274 Mounting And Operating Instructions

7 Operation

7.1 Positioner
The positioner ensures a predetermined assignment of the valve position to the input signal.
The position feedback is provided as a current signal at terminals 31 and 32 and as a volt-
age signal at terminals 32 and 33.
Î Jumper terminals 31 and 32 when the voltage signal is used.
Note
The following applies to split-range operation: to prevent that the valves overlap, a dead
band of e.g. ±0.5 mA must be added (according to Fig. 8). In this case, valve 1 must be set
from 11.5 to 4 mA and valve 2 from 12.5 to 20 mA (corresponding values apply to voltage
input signals).
Adjusters and slider switches
The adjusters are located in the terminal space of the actuator.
Î Open the side housing cover to access them.
DANGER
!
Risk of electric shock from exposed live parts.
Do not touch live parts on operating the adjusters and slider switches.
Zero
in
60
40
20
0
Starting point (zero)
Fig. 9: Adjusters and slider switches
EB 8340 EN
Adjusters
Span
out
80
100
%
Position feedback (output signal)
Span
in
Upper range value (span)
Slider switch
on
off
1 2 3
SW1
SW2
SW3
Operation
4
SW4
21