GEM 1435 ePos - Page 52

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17 System mode ADVANCED
The positioner adapts to the valve when automatic initialization is started (via the Start Init Valve parameter). Relevant paramet-
ers are independently and automatically retrieved. This procedure can take a few minutes, dependent on the valve. The initializa-
tion can alternatively be started via the Init Valve parameter in the Set Basics menu item.
If the message Init Valve Ok appears, the product is ready for operation and can be set to the desired operating mode. Further
information.
If an error message appears during the initialization process.
NOTICE
Valve travel times (up-down, down-up)
▶ The valve travel times are measured and displayed. If these measure < 1 second, an error is displayed and the valve travel
time must be set to at least > 1 second using the throttle screw(s). This step may need to be repeated several times until an
optimal valve travel time can be achieved. Experience has shown that valve travel times of approx. 1-2 seconds produce op-
timal control characteristics. The two valve travel times should ideally not be too far apart.
NOTICE
Tip for use
▶ During automatic initialization of actuators whose movement profiles are not continuous (i.e. with undefined stopping or
stalling, e.g. with large size butterfly valves), it may not be possible to clearly detect the end positions and unjustified error
messages may appear (for example LEAKAGE).
▶ Manual initialization with sequential movement through the menu by the operator or, if possible, acknowledging the error
message to repeat the step may help here.
Service
1
SetBasics
2
Setpoint: 4-20mA Default State: YES
Init All
Init Valve
Auto.. Man ESC
Setup
A: w XX.X: x XX.X
SETUP
Starten der
manuellen Initialisierung
Mode Auto
Manual
OFF
2 x betätigen
goClose XX.X%
goClose XX.X%
Valid? OK ESC
goOpen XX.X%
goOpen XX.X%
Valid? OK ESC
findCoefficient
findCoeff XX.X%
ESC
adjTime 0,0: 0,0
adjTime 0,0: 0,0
ESC
InitPilot
InitPilot XX.X%
ESC
Return
Init Valve OK
Starting manual
initialization
Press twice
Init All = Man: Manual initialization
When manual initialization is started, the positioner runs through an initialization program that is similar to the automatic initial-
ization. The various program steps must, however, be started and confirmed during manual initialization by pressing the
key.
- Manual initialization should only be used if automatic initialization does not achieve satisfactory positioning.
- The menu items goClose and goOpen should be executed several times for very small valve strokes in order to ensure an op-
timum adaptation of the positioner to the valve.