95
Start-Up
25.5.2.1. Preparatory measures for execution of P.TUNE in the MANUAL
operating state
Moving process actual value PV to the operating point:
Key Action Description
Setting on the process level:
/ Select PV The process actual value PV is indicated on the display.
MANU
Press
Change to MANUAL operating state.
The input screen for manually opening and closing the valve is
displayed.
Open valve
OPN
or
By opening or closing the control valve, move the process actual
value to the required operating point.
Close valve
CLS
As soon as the process actual value PV is constant, the P.TUNE function can be started.
Table 49: P.TUNE; preparatory measure for running X.TUNE in the MANUAL operating state
25.5.2.2. Preparatory measure for execution of P.TUNE in the
AUTOMATIC operating state
By inputting a process set-point value SP, move the process actual value PV to the operating point.
Observe the internal or external set-point value default for the input
(P,CONTROL → SETUP → SP-INPUT → intern/extern):
For intern set-point value default: Input the process set-point value SP via the device keyboard
(see description below "Table 50" ).
For extern set-point value default: Input the process set-point value SP via the analog set-point value
input.
Inputting a process set-point value:
Key Action Description
Setting on the process level:
/ Select SP The process set-point value is indicated on the display.
INPUT
Press
The input screen for inputting the process set-point value is
displayed.
/ Input value
<–
Select decimal place
Increase value
The selected set-point value SP should be near the future operating
point.
OK
Press
Acknowledge input and return to the display of SP.
Table 50: P.TUNE; preparatory measure for running X.TUNE in the AUTOMATIC operating state
The process variable PV is changed according to the set-point value default based on the factory default PID
parameters.
→ Before running the P.TUNE function, wait until the process actual value PV has reached a stable state.
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