Figure 26: View on control unit
[1] Potentiometer
9.7.1. 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).
9.8. RWG electronic position transmitter
— Option —
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 10: RWG 4020
2-wire system3-wire and 4-wire systemsData
4 – 20 mA0 – 20 mA, 4 – 20 mAOutput current I
a
14 V DC + (I x R
B
), max. 30 V24 V DC (18 – 32 V)Power supply U
V
1)
20 mA24 mA at 20 mA output currentMax. current consumption
(U
V
– 14 V)/20 mA
600 Ω
Max. load R
B
0.1 %/V0.1 %/VImpact of power supply
0.1 %/100 Ω0.1 %/(0 – 600 Ω)
Load influence
< 0.3 ‰/KTemperature impact
–76 °F to 176 °F (–60 °C to +80 °C)Ambient temperature
2)
5 kΩ
Transmitter potentiometer
Power supply possible via: AC, AM controls or external power supply1)
Depending on temperature range of the actuator: Refer to name tag2)
Setting components
The RWG 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 three potentiometers [1], [2] and [3].
37
SAEx 07.2 – SAEx 16.2 / SAREx 07.2 – SAREx 16.2
Commissioning
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