Direction Of Action - Samson 5757-7 Mounting And Operating Instructions

valve needs to move through the range from 0 to 100 % without stopping. Its default setting
is optimally tuned in this device and therefore should not be changed (Ty = 24 s).
The Dead band (P12) determines the reaction to the controlled state, i.e. the actuator is not
active if the controlled variable moves within the dead band.
Parameters
P09 – Kp flow temperature control
P10 – Tn flow temperature control
P11 – Ty actuator transit time for valve travel
P12 – Dead band (switching range)
6.9

Direction of action

Increasing/increasing (F03 - 0)
4
Actual value < Set point: Actuator stem retracts
4
Actual value > Set point: Actuator stem extends
Increasing/decreasing (F03 - 1)
4
Actual value < Set point: Actuator stem extends
4
Actual value > Set point: Actuator stem retracts
Actuator stem extends
For globe valve:
For three-way mixing valve:
For three-way diverting valve: Port AB -> A closed, port AB -> B open
Actuator stem retracts
For globe valve:
For three-way mixing valve:
For three-way diverting valve: Port AB -> A open, port AB -> B closed
Function
F03 – Direction of stem action
120 s
2.0 %
Valve CLOSED
Port A -> AB open, port B -> AB closed (see Fig. 13)
Valve OPEN
Port A -> AB closed, port B -> AB open (see Fig. 13)
WE Range of values
2.0 0.1 to 50.0
0 to 999 s
24 s 10 to 240 s
0.5 to 5.0 %
WE Configuration
0 F03 - 0: Increasing/increasing
F03 - 1: Increasing/decreasing
Functions
26
EB 5757-7 EN