Figure 92: 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].
11.3.1. 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].
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 potentiometer [2] in opposite direction until the following value is reached:
- for 0 – 20 mA approx. 0.1 mA
- for 4 – 20 mA approx. 4.1 mA
➥
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.
9. Approach end position CLOSED again and check minimum value (0.1 mA or
4.1 mA). If necessary, correct the setting.
Information
If the maximum value cannot be reached, the selection of the reduction gearing must
be checked.
11.4. Mechanical position indicator: set
1. Fit indicator disc onto shaft.
2. Move valve to end position CLOSED.
3.
Turn lower indicator disc until symbol (CLOSED) is in alignment with the
mark on the cover.
4. Move actuator to end position OPEN.
79
SAEx 07.2 – SAEx 16.2/SAREx 07.2 – SAREx 16.2 Control unit - electromechanical
ACExC 01.2 Intrusive Modbus RTU Commissioning (optional equipment settings)
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