2
02
0-
01
16
Output function in normal operation
7.1
Function of the Analog Output I/U
Function in normal operation
The position of the actuator defined by the angular positioning system is based on half of the
actuator width (center of the actuator). The start point of the analog output is preset to the
angular position 0
°
and the analog measuring range is set to a full 360
°
in the factory. The start
and end points of the analog measuring range can be defined by programming each relevant
angular position, the only restriction being that the analog measurement range must fall
between 45
°
and 360
°
.
After switching on, the angular positioning system automatically evaluates the load connected
at the analog output. If the load is a low resistance load (<400
), the analog output assumes
the function of a current output 4 mA ... 20 mA. If the load is a high resistance load (>3.3 k
),
the analog output assumes the function of a voltage output 0 V ... 10 V.
The analog output shows the minimum value of the relevant value range (4 mA or 0 V) at the
start position (I/U1). If the actuator rotates toward the programmed end position (I/U2), the out
-
put value increases proportionally in relation to the rotation angle covered. When the pro
-
grammed end position is reached (I/U2), the analog output shows its maximum value (20 mA or
10 V). If the actuator moves within the area of the programmed measurement range, the corre
-
sponding yellow LED lights up. If the actuator rotates beyond the limits of the programmed
measurement range, the LED goes out. The output logic depends on whether the analog out
-
put assumes the function of a voltage or a current output.
Current output:
If the measurement range is exceeded, the analog output value adopts the fault signal 3.6 mA.
The current output delivers this fault current until the position of the actuator falls back within
the programmed analog measurement range.
Voltage output:
If the measurement range is exceeded, the analog output value retains the last displayed value
until the position of the actuator falls back within the analog measurement range (depending on
the direction of rotation, i.e., 0 V or 10 V).
When the position falls back within the programmed measurement range, the output value is
updated according to the position of the actuator and adopts the programmed function.
Note
The impedance measurement and automatic determination of the output function
(current/voltage) only take place when the operating voltage is switched on. Any change made
to the load impedance during operation is no longer re-evaluated by the sensor. A load change
during operation can therefore cause the sensor to produce seemingly incorrect output logic.
Caution!
Make sure that the connected load is always low resistance (
400
) or high resistance (
3.3
k
).
If a load is connected with an impedance between 400
and 3.3 k
, this may result in unde
-
fined output values because the sensor cannot fully control the analog output. The output logic
(current or voltage output) is not defined either.
