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4.3 Setting the digital positioner
In the actuator version with digital
positioner, the travel is calibrated automati
-
cally, allowing the travel (controlled variable
x) and the input signal (reference variable
w) of the positioner to be matched in the
best possible way. Additionally, the digital
positioner provides valve position feedback
for remote transmission.
Setting and start-up can be carried out us
-
ing four different operating modes. Oper
-
ating modes 1 and 2 work with set data
stored in the positioner's memory. The user
only needs to select the operating mode via
the selector switch (2) and press the button
(4) to start travel calibration.
Note!
Setup with operating modes 3 and 0 =
can only be performed using a SAMSON
memory pen as the storage medium, or in
connection with SAMSON's TROVIS-VIEW
Configuration and Operator Interface soft-
ware and a PC or bus system. Setup with
operating modes 3 und 0 = is described
in Mounting and Operating Instructions
EB 8331-2 EN.
Settings for operating modes 1 and 2
Increasing characteristic: actuator stem re
-
tracts or extends as the reference variable
increases.
After the actuator has been mounted on the
valve as described in section 2.2 and the
electrical connections have been established
as described in section 3, proceed as fol
-
lows:
1. Set selector switch (2) with the arrow
pointing to operating mode 0 =
(control switched off).
2. Check mounting position of the potenti
-
ometer gear (12).
The gear must be put onto the potentiometer
shaft to correspond with the rated travel of
the control valve. The inscription
“Nennhub 15” (for 6 to 20 mm travel) or
“Nennhub 30” (for 6 to 35 mm travel) must
be legible from above on the associated
gear side. If this is not the case, pull the
gear off the shaft and put it back on again
with the reverse side facing upwards, allow
-
ing the intermediate gear to engage prop
-
erly.
Note!
Actuators with fail-safe action "Actuator
stem retracts" or "extends" are only de-
signed for a rated travel of 15 mm. Do not
rearrange the gear!
Make sure that the shaft of the potentiometer
(12.1) is adjusted correctly.
3. Switch on auxiliary power and set the
reference variable to a value > 4 mA.
4. Set selector switch (2) with the arrow
pointing to operating mode 1 for 4 to
20 mA or 2 to 10 V input and alarm
signal, or set it to operating mode 2 for
0 to 20 mA or 0 to 10 V input and
alarm signal.
5. Press button (4) to start travel calibra
-
tion.
14 EB 8331-1 EN
Operation and setting