EB 8389-1S EN
9
Description
1.2
Start-up
The positioner must be initialized to use the
full scope of the valve diagnostics. During ini-
tialization the positioner adapts itself optimal-
ly to the friction conditions and the signal
pressure required by the control valve. The
positioner can be initialized using one of the
following initialization modes: maximum
range (MAX), nominal range (NOM), manual
setting 1 (MAN) and manual setting 2
(MAN2).
−
Maximum range (MAX)
Initialization mode for simple start-up of
valves with two clearly defined mechani
-
cal end positions, e.g. three-way valves
−
Nominal range (NOM)
Initialization mode for all globe valves
−
Manual setting 1 (MAN)
Initialization mode for globe valves re-
quiring OPEN position to be entered
manually
−
Manual setting 2 (MAN2)
Initialization mode for globe valves re-
quiring the end positions (OPEN and
CLOSED positions) to be entered manu-
ally
The type of application, pressure limit and
the start-up parameters required for the se-
lected initialization must be entered to initial-
ize the positioner.
Note:
Positioner start-up is described in detail
in the associated Mounting and Oper-
ating Instructions (
u
).
The monitoring of friction, supply pressure,
leakage, actuator springs, course of end po-
sition and zero point shift requires additional
reference tests of the valve signature to be
performed. Refer to Section 4. The reference
tests required for the diagnostic functions
cannot be performed if the positioner has
been initialized in the substitute calibration
(SUB) mode. By setting 'Initialization includ
-
ing valve signature' = Yes, the positioner re
-
cords the reference data automatically after
initialization.
Start-up
−
Type of application (Code 49 - h0): Control
valve, [On/off valve]
−
Initialization mode (Code 6): [Maximum
range (MAX)], Nominal range (NOM), Manual
setting 1 (MAN) or Manual setting 2 (MAN2)
−
Initialization including valve signature
(Code 48 - h0): [Yes]
−
Pin position (Code 4): [Off], 17, 25, 35, 50,
70, 100, 200 mm, 90°
−
Pressure limit (Code 16): 1.4 to [7.0] bar
During positioner initialization, the 'Kp level'
and 'Tv level' are optimally set. If the posi
-
tioner tends to overshoot impermissibly due
to other disturbances, the proportional-ac-
tion coefficient (Kp level) and derivative-ac
-
tion time (Tv level) can be adapted accord-
ingly. Increment the derivative-action time
until the desired behavior is reached. When
the maximum value of 4 is reached for the
derivative-action time, the proportional-ac-
tion coefficient can be reduced in steps.
