Samson 3730-3 ESD, Mounting And Operating Instructions

measured variable have been stored, the
logging is stopped. However, the test is still
completed. The

Measured data storage out

of memory alarm is generated. The Recom-
mended sampling time, which should not be
shorter, if at all possible, is calculated from
the

Duration of the test.

The

Display

section in TROVIS-VIEW 3

shows the

Progress flag in percent.

1. Step response 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".

Note!

A step before the partial stroke test can be
prevented by allocating the value of the
manual reference variable w to the Step
start

parameter.

The valve is moved to the

Step end (pos. 3)

and

Step start (pos. 2) positions with fixed

velocities (v

1

and v

2

) set by the

Ramp time

(falling) and Ramp time (rising) parameters.

10

EB 8388-1 EN

ESD functions

Pos. 1

Pos. 2

Pos. 3

t

1

t

2

t

2

[%]

[s]

Pos. 1

Pos. 2

Pos. 3

t

1

t

2

t

2

[%]

w

w

[s]

t

t

v

1

v

2

Fig. 2 · Courses of the partial stroke tests with step response (left) and ramp function (right)

Valve positions:

Pos. 1 = Required manual

reference variable w

Pos. 2 = Step start
Pos. 3 = Step end

Times:

t

1

= Settling time before test start

t

2

= Delay time after step

Velocities:

v

1

=

100

Ramp time (falling)

%

s

v

2

=

100

Ramp time (rising)

%

s

Step response

Ramp function