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Motorized Rotary Actuator
[0 0 0]
open
shut
0 %
100 %
input signal
Linear
Fig. 12: Graphical illustration of selection of functions by DIP switches 7, 8 & 9
DIP10:
An actuator characteristic can be used indirectly to change a valve characteristic. If, for
example, the valve has an equal percentage characteristic, an inverse equal percentage
actuator characteristic can be used to generate a resulting linear characteristic, see illustration
below.
The actuator characteristic (DIP 10) can also be combined with the characteristics which
can be selected using DIPs 7, 8 and 9 (e.g. split range). The microcontroller first processes
the characteristic defined by DIPs 7, 8 and 9 and subsequently the characteristic defined by
DIP 10.
In Modbus mode, two further actuator characteristics can be selected: equal percentage and
quadratic inverse equal percentage.
DIP11:
DIP switch 11 defines the mode of operation: 1 = Modbus mode, 0 = standard mode.
Standard mode is used to apply predefined normal settings.
DIP12:
Starts an initialization run when switched from 0 to 1. If DIP 12 is left in position 1 when the
7020A positioner is switched on, an initialization run will not be startet.
As long as DIP 12 is set to 1, errors and alarms occurring during normal positioner operation
will not be shown. This enables errors occurring during initialization to be distinguished from
errors during normal positioner operation. Switch DIP 12 back to 0 after the initialization run
(after having analysed possible error codes) to show any errors occurring in normal positioner
operation on the red LED. See also section 7.5.2 "Initialization run".
W. Baelz & Sohn GmbH & Co. · Koepffstrasse 5 · 74076 Heilbronn · Germany · www.baelz.de
open
open
shut
shut
Split range
split 50 %
Desired
DIP-switch 10
characteristic
Equal percentage
1
0
10
Quadratic
actuator characteristic
only selectable in
Modbus mode
Linear
1
0
10
actuator characteristic
Equal percentage
only selectable in
Modbus mode
1
Linear
0
10
open
shut
0 %
11-point
Split range
characteristic
split 33 %
Characteristic of the
Characteristic of the
Effective at valve
valve
actuator
Travel
Signal
Travel
Signal
Travel
Signal
Travel
Signal
Travel
Signal
= factory setting
baelz 375-E42
[0 1 1]*
[1 1 1]*
open
shut
100 %
0 %
Inverse linear
Signal
Signal
Signal
Signal
a
Signal
Seite | Page
23 |
100 %
32
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