10. Commissioning (optional equipment settings)
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 51: View on control unit
[1] Potentiometer
10.1.1. Potentiometer: set
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 15: 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 mA600 ΩMax. 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
–60 °C to +80 °CAmbient temperature
2)
5 kΩTransmitter potentiometer
Power supply possible via: AC, AM actuator controls or external power supply1)
Depending on temperature range of the actuator: Refer to name plate2)
49
SA 25.1 – SA 48.1 / SAR 25.1 – SAR 30.1
AM 02.1 Commissioning (optional equipment settings)
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