Technical data
Table 27: RWG 5020
2-wire system
Data
4 – 20 mA
Output current I
a
10 – 28.5 V DC
Power supply U
V
1)
< 200 mA
Short-circuit current I
K
1)
< 0.9 W
Power P
1)
(U
V
– 10 V)/20 mA
Max. load R
B
0.1 %
Impact of power supply
0.1 % (R
B
= 0...600
Ω
)
Load influence
< 0.1 ‰/K
Temperature impact
5 k
Transmitter potentiometer
– 60 °C
2)
/–40 °C bis +60 °C
3)
Ambient temperature
II2G Ex ib IIC T4
Explosion protection
PTB 03 ATEX 2176
EC type test certificate
Power supply via external, intrinsically safe (Ex ia or Ex ib) power supply unit with type test certificate
meeting the technical requirements of RWG 5020 Ex.
1)
For heater in switch compartment
2)
Ambient temperature depending on temperature range of the actuator: Refer to name plate
3)
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 89: View on control unit when switch compartment is open
[1]
Potentiometer (travel sensor)
[2]
Potentiometer min. (4 mA)
[3]
Potentiometer max. (20 mA)
[4]
Measuring points 4 – 20 mA
The output current (measuring range 0 – 20 mA) can be checked at the measuring
points [4].
10.2.1.
Measuring range: set
For measuring range setting, voltage must be applied at the position transmitter.
1.
Move valve to end position CLOSED.
2.
Connect measuring equipment for 0 – 20 mA to the measuring points [4].
3.
Turn potentiometer [1] clockwise to the stop.
4.
Turn potentiometer [1] slightly in opposite direction.
5.
Turn potentiometer [2] clockwise until output current starts to increase.
6.
Turn back potentiometer [2] until a value of approx. 4.1 mA is reached.
➥
This ensures that the signal remains above the dead and live zero point.
7.
Move valve to end position OPEN.
8.
Set potentiometer [3] to end value 20 mA.
73
SAEx 25.1 – SAEx 40.1 / SAREx 25.1 – SAREx 30.1
ACExC 01.2
Commissioning (optional equipment settings)
