ARI Armaturen ARI-PREMIO - Manual (Page 50)

Page 50 0040501000 4511
Operating and installation instructions
Thrust actuator ARI-PREMIO
5.5.14.8 Setting zero point and slope span
The 4...20mA or 2...10V output control signal is adjusted to the potentiometer stroke by
miniature potentiometers S (slope) and N (zero).
Zero point setting
- The zero point setting is always made before the slope span setting.
- Potentiometer must be at approximately 0
Ω .
- Before measuring resistance, isolate the potentiometer from the RI32 position indicator
and reconnect after measuring.
- Resistance measurement at the potentiometer cable between Rb and Rc.
- Make the connection in accordance with the wiring diagram.
- Zero point setting is made at the zero point setscrew marked N.
- Adjust zero point setscrew N so that the desired minimum control signal value is applied to
the meter.
- Rotate zero point setscrew N to the right to increase the output signal, rotate to the left
to reduce it (a slip clutch engages after 12 rotations)
For example:
- Current output ........minimum value ......... = 4 mA
- Voltage output ........minimum value ......... = 2 V
Slope span setting
The slope span setting is made after the zero point setting.
- Before measuring resistance, isolate the potentiometer from the RI32 position indicator
and reconnect after measuring.
- Resistance measurement at potentiometer cable between Rb and Rc.
- Adjustment of resistance range to control signal output range is set at the slope span
setscrew marked S.
- The meter from the zero point setting stays in the same measurement range for the slope
span setting.
- Adjust the slope span setscrew S so that the desired maximum control signal value is
applied to the meter.
- Rotate slope span setscrew S to the right to increase the output signal, rotate to the left
to reduce it (a slip clutch engages after 12 rotations).
For example:
- Current output ........maximum value ........= 20 mA
- Voltage output ........maximum value ........= 10 V