GEM 1435 ePos - Page 36

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16 System mode CLASSIC
16: Error Time
Monitoring time for setting the error messages (10 x travel
time). The set value (s) serves as a specified value for the
time within which the positioner must have reached the idle
state. The associated trigger threshold is specified with para-
meter 17. When the set time has been exceeded, the error
message output ERR is set at 24 V DC.
17: Error Level
Error Level:
Trigger threshold of the error message
Here, a value (%) can be set for the permissible size of system
deviation for triggering the error message.
If parameters 16 and 17 are both set to AUTO, the error mes-
sage is set if the slow-travel zone has not been reached within
a set time. This time is 10x (parameter value AUTO) the initial-
ization travel time.
18: Range Function
Range Functn:
Range monitoring of the set value signal
Here, it is possible to set whether the Range error signal is
triggered when it falls below 4mA (cable break monitoring) or
exceeds 20mA (short-circuit monitoring).
- 21: Min Position
Limits the CLOSED position of the valve
This function is equivalent to a mechanical seal adjuster.
- 22: Max Position
Limits the OPEN position of the valve
This function is equivalent to a mechanical stroke limiter.
0
80
60
40
20
100
100
80
60
40
20
Limited stroke
Unlimited stroke
Set value w
[%]
Physical stroke x [%]
Max. Pos
Min. Pos
NOTICE
Min/Max Position
▶ The mechanical regulating distance (from limit stop to
limit stop) is limited to the set values with the parameters
Min Position and Max Position. This way, the actuator's
mechanical positioning range can be limited.
23: Closetight
If parameter 23: Closetight is activated, the actuator is vented
at a set value of < 0.5%, even if there is a set Min Position of,
for example, 10%. With a set value of > 1.5% the actuator is
moved back to 10%.
With a set value of > 99.5%, the actuator is opened com-
pletely, even if the Max Position is set, for example, to 90%.
With a set value of < 98.5%, the actuator is moved back to
90%.
0
98,5
1,5
0,5
99,5
100
100
80
60
40
20
Set value w
[%]
Stroke x
[%]
24: SetP Direction
Set value direction
Setting the set value direction serves to reverse the direction
of the set value. It is mainly required for split-range operation
and for single acting actuators with the fail safe OPEN setting
(control function 2).
Control function 1
NORMAL
Control function 2
INVERSE
Control function 2
NORMAL
Control function 1
INVERSE
Stroke
x
Open
Closed
Set
value
[%]
[%]
NOTICE
▶ The intended direction of action is that a 0% set value sig-
nal is always assigned to the closed valve position (0%
stroke). In order to achieve this, the setting is automatic-
ally adjusted if an inverted direction of action (e.g. control
function 2) is identified during initialization.