Samson 3787 Mounting And Operating Instructions page 49

CHARACT
Index: 42
Access: r, w
Input:
Default:
COLLECTION_DIRECTORY
Index: 12
Access: r
DEADBAND
Index: 35
Access: r, w
Range:
Default:
DELAY_TIME
Index: 37
Access: r, w
Range:
Default:
DEVIATION
Index: 34
Access: r
FINAL_VALUE
Index: 13
Access: r
FINAL_VALUE_CUTOFF_HI
Index: 15
Access: r, w
Range:
Default:
S Selection of characteristics to assign the correction value to the travel range/angle of
rotation.
LINEAR
EQUAL PERCENTAGE
EQUAL PERCENTAGE REVERSE
SAMSON BUTTERFLY LINEAR
SAMSON BUTTERFLY EQUAL PERCENTAGE
VETEC ROTARY LINEAR
VETEC ROTARY EQUAL PERCENTAGE
LINEAR
Note:
This parameter is not processed in the Type 3787.
S Dead band in percent of the rated travel /nominal angle.
0.1 ... 10 %
0.5 %
S Reset criteria for running control loop monitoring. If the DELAY_TIME entered is
exceeded and the system deviation is not within the TOLERANCE_BAND, a control
loop fault is reported.
It is determined from the minimum transit time during initialization.
1 ... 240 s
10 s
D Deviation of the positioner
N This parameter contains the correction value received from the upstream connected
Analog Output Function Block.
S Final position
if the set point exceeds the entered value, the valve is moved towards the final position
that corresponds to 100 % of the manipulated variable. This is done by completely
venting or filling the actuator (depending on the fail-safe position).
0 ... 125 %
9 9 %
Note:
The function is cleared when –2.5 % is entered.
Since the actuator is completely filled or vented when this function is activated, the
control valve moves to its absolute final position. Limitations in the functions "travel
range" or "mechanical limit stops" do not apply here.
In case, impermissibly high positioning forces arise due to this, the function must be
cleared.
Parameter description
49
EB 8383-1 EN