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W. Baelz & Sohn GmbH & Co.
· Koepffstrasse 5 · 74076 Heilbronn · Germany ·
www.baelz.de Seite | Page
Motorized Rotary Actuator
baelz 375-E42
7.4.1 Details on DIP switches
DIP1 and DIP2:
are interpreted together:
DIP1: 0 = voltage →
DIP2: 0 = 0-10 V or 1 = 2-10 V.
DIP1: 1 = current →
DIP2: 0 = 0-20 mA or 1 = 4-20 mA.
Attention
Either a voltage source can be connected to the U-terminal or a current source
to the I-terminal. Never connect both at the same time.
DIP3:
DIP switch 3 configures the analogue outputs AO1 and AO2 (see wiring diagram,
). DIP switch 3 defines the scaling of the two analogue outputs. When DIP 3 = 0, AO1 is
set to 0-10 V and AO2 to 0-20 mA (factory setting), when DIP 3 = 1, AO1 is set to 2-10 V and
AO2 to 4-20 mA. In Modbus mode AO1 and AO2 can be configured separately.
Using 2-10 V / 4-20 mA enables clear identification of a loss of signal (= 0 V / 0 mA).
DIP4:
DIP switch 4 changes the direction of operation of the actuator.
The direction of operation can only be changed if the unit has been initialized. Until the unit has
been initialized, the following setting applies: Valve closes when actuator turns anticlockwise.
There can also be no change in the direction of operation during an initialization run, whether
or not the unit was already initialized before starting the current initialization run.
The direction of operation must not be confused with heating/cooling! Heating in standard
mode is carried out with DIP switches 7, 8 and 9 set to "0". Cooling in standard mode is
carried out with DIP switches 7, 8 and 9 set to "1". Split-range can be combined with heating in
standard mode, but not with cooling. In Modbus mode, split-range can be combined with both
heating and cooling.
DIP5:
Saves the current position as switching position "2EZ-1" when switched from 0 to 1. No
function is assigned to switching from 1 to 0. Even if DIP 5 is left in position 1 when the 7020A
positioner is switched on, the current position will not be saved.
DIP6:
Saves the current position as switching position "2EZ-2" when switched from 0 to 1. No
function is assigned to switching from 1 to 0. Even if DIP 6 is left in position 1 when the 7020A
positioner is switched on, the current position will not be saved.
DIP7, DIP8 and DIP9:
These three DIP switches work together to define the split range function at analogue input 2
(AI2).
FUNCTION
DIP7
DIP8
DIP 9
Linear, 1:1
0
0
0
Split Range: split 50 %, offset 0 %
1
0
0
Split Range: split 50 %, offset 50 %
0
1
0
Split Range: split 33.3 %, offset 0 %
1
1
0
Split Range: split 33.3 %, offset 33.3 %
0
0
1
Split Range: split 33.3 %, offset 66.6 %
1
0
1
11-point characteristic
0
1
1
Inverted: 0 becomes 100 and 100 becomes 0 %
1
1
1
Tip:
