Figure 91: View on control unit
[1] Potentiometer
11.2.1. 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).
11.3. 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 35: 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)
Setting elements
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].
78
SAEx 07.2 – SAEx 16.2/SAREx 07.2 – SAREx 16.2 Control unit - electromechanical
Commissioning (optional equipment settings) ACExC 01.2 Intrusive Modbus RTU
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