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).
10.3.
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 26: 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
–60 °C to +80 °C
Ambient temperature
2)
5 k
Ω
Transmitter potentiometer
Power supply possible via: AC, AM actuator 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].
Figure 66: View on control unit when switch compartment is open
[1]
Potentiometer (travel sensor)
[2]
Potentiometer min. (0/4 mA)
[3]
Potentiometer max. (20 mA)
[4]
Measuring point (+) 0/4 – 20 mA
[5]
Measuring point (–) 0/4 – 20 mA
The output current (measuring range 0 – 20 mA) can be checked at measuring points
[4] and [5].
10.3.1.
Measuring range: set
For measuring range setting, voltage must be applied at the position transmitter.
1.
Move valve to end position CLOSED.
2.
Connect ammeter for 0 – 20 mA to measuring points [4 and 5].
63
SQ 05.2 – SQ 14.2 / SQR 05.2 – SQR 14.2 Control unit - electromechanical
AC 01.2 Intrusive Modbus RTU
Commissioning (optional equipment settings)
