10.
Commissioning (setting optional equipment)
10.1.
Potentiometer
The potentiometer is used as travel sensor and records the valve position.
Setting elements
The potentiometer is housed in the actuator switch compartment. The switch
compartment must be opened to perform any settings. Refer to <Switch compartment:
open>.
Setting is made via potentiometer [1].
Figure 48: View of control unit
[1]
Potentiometer
10.1.1.
Potentiometer setting
Information
Due to the ratio of the reduction gearing, the complete resistance range/stroke is not
always covered. Therefore, external adjustment (setting potentiometer) must be
provided.
1.
Move valve to end position CLOSED.
2.
Turn potentiometer [1] clockwise to the stop.
➥
End position CLOSED corresponds to 0 %
➥
End position OPEN corresponds to 100 %
3.
Turn potentiometer [1] slightly in opposite direction.
4.
Perform fine-tuning of the zero point at external setting potentiometer (for remote
indication).
10.2.
RWG electronic position transmitter
The RWG electronic position transmitter records the valve position. On the basis of
the actual position value measured by the potentiometer (travel sensor), it generates
a current signal between 0 – 20 mA or 4 – 20 mA.
Technical data
Table 17: RWG 4020
2-wire system
3-wire and 4-wire systems
Data
4 – 20 mA
0 – 20 mA, 4 – 20 mA
Output current I
a
14 V DC + (I x R
B
), max. 30 V
24 V DC (18 – 32 V)
Power supply U
V
1)
20 mA
24 mA at 20 mA output current
Max. current consumption
(U
V
– 14 V)/20 mA
600
Ω
Max. load R
B
0.1 %/V
0.1 %/V
Impact of power supply
0.1 %/100
Ω
0.1 %/(0 – 600
Ω
)
Load influence
< 0.3 ‰/K
Temperature impact
–76 °F to 176 °F (–60 °C to +80 °C)
Ambient temperature
2)
5 k
Ω
Transmitter potentiometer
Power supply possible via: AC, AM controls or external power supply
1)
Depending on temperature range of the actuator: Refer to name tag
2)
48
SAEx 25.1 – SAEx 35.1 / SAREx 25.1 – SAREx 30.1
Commissioning (setting optional equipment)
NORM (without controls)
