Samson 3730 Series Mounting And Operating Instructions page 9

When the test is active, the test duration de-
termined by the positioner is indicated by
the Duration of the test parameter. The Dis-
play section in TROVIS-VIEW 3 shows the
Progress flag in percent.
1. Step change function, Fig. 2 left
The step response function is activated when
the Activation of the ramp function parame-
ter is set to "Off".
The valve is moved in steps to the Step end
position (pos. 3) during the first half of the
test and to the Step start position (pos. 2)
during the second half of the test.
2. Ramp function, Fig. 2 right
The ramp function is active when the Activa-
tion of the ramp function parameter is set to
"On".
w [%]
Step change function
Pos. 1
Pos. 2
Pos. 3
t
1
Valve positions:
Pos. 1 = Required manual
reference variable w
Pos. 2 = Step start
Pos. 3 = Step end
Fig. 2 · Courses of the partial stroke tests with step change (left) and ramp function (right)
t
t
2
[s]
t
2
Times:
t = Settling time before test start
1
t = Delay time after step
2
The valve is moved to the Step end (pos. 3)
and Step start (pos. 2) positions with fixed
velocities (v and v
1
(falling) and Ramp time (rising) parameters.
The ramp time specifies the time required by
the valve to move through the travel range
100 to 0 % (falling) and 0 to 100 % (rising).
Note!
Times for the Ramp time (falling/rising) are
determined during initialization of the
positioner. These times are not to be ex-
ceeded when setting the parameters for the
partial stroke test with ramp function.
w [%]
Ramp function
Pos. 1
Pos. 2
Pos. 3
t
1
ESD functions
) set by the Ramp time
2
v v
1 2
t
2
t
2
Velocities:
100
v =
1
Ramp time (falling)
100
v =
2
Ramp time (rising)
EB 8388-1 EN
t
[s]
%
s
%
s
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