Figure 21: View on control unit
[1]
Potentiometer
9.8.1.
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).
9.9.
Electronic position transmitter RWG
— Option —
The electronic position transmitter RWG 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 7: RWG 4020
2-wire system
3-wire or 4-wire system
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
–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 plate
2)
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].
31
SQ 05.2 – SQ 14.2/SQR 05.2 – SQR 14.2
Commissioning
