Operating instructions

Turn
®
ZP
4
Press INIT key!
Zero calibration is started, the positioner
moves the control valve to the CLOSED
position and readjusts the internal electri
-
cal zero point.
7.8 Settings for on/off valves
If the valve is to be operated using the
on/off valve as the type of application, the
operating point, test limits and limits for the
discrete analysis must be defined.
Note: The travel range of on/off valves is
defined using the fail-safe position and the
given
Operating point . As a result, the fol-
lowing parameters to define the operating
range and the range of the reference vari-
able (set point) cannot be changed or ana-
lyzed:
Lower travel/angle range value (Code 8)
Upper travel/angle range value (Code 9)
Lower travel/angle limit (Code 10)
Upper travel/angle limit (Code 11)
Set point, lower range value (Code 12)
Set point, upper range value (Code 13)
Discrete analysis
If the reference variable (w ) is below
Operating point limit (Code 49 - h5) at the
start of automatic operation, the valve
( ) moves to the fail-safe position. If
the reference variable increases and ex
-
ceeds the
Operating point limit, the valve
moves to the
Operating point (Code 49 -
h1). The valve moves back to the fail-safe
position if the reference variable continues
and falls below the
Fail-safe action limit
(Code 49 - h2).
If the reference variable (w ) is above
the
Operating point limit (Code 49 - h5)
when automatic mode starts, the valve
( ) moves to the
Operating point
(Code 49 - h1). The valve moves back to the
fail-safe position if the reference variable
continues and falls below the
Fail-safe ac-
tion limit
(Code 49 - h2).
EB 8384-6 EN 69
Start-up – Settings
Δt < 6 s Time [s]
Travel [%]
20
40
60
80
100
Code 49 - h1
Code 49 - h5
Code 49 - h2
Δt < 6 s
20
40
60
80
100
Time [s]
Travel [%]
Code 49 - h1
Code 49 - h5
Code 49 - h2