Automatic Centre Mode; Maximum Hold Mode - Festo SOEL-RTD-Q50-PP-S-7L Instructions De Service Et De Montage

SOEL-

Automatic centre mode

The output characteristic curve 4 – 20 mA is displaced with this function. When the automatic centre function is activated
and Q = +U , the current measured value is equated with the output value of 50% = 12 mA. The incline of the characteristic
1 B
curve is maintained and the minimum and maximum values of the characteristic curve are limited by the measuring range.
The distance to the object must be within the measuring range.
Analogue signal
100% (20 mA)
50% (12 mA)
0% (4 mA)
+U
B
Q
1
-U
B
Illustr. 13
15500146

Maximum hold mode

When maximum hold mode is activated and Q
stores it.
If Q = -U , the last maximum value is transmitted at the analogue output.
1
B
Example of use: determining the maximum value of a shaft
The minimum value can be determined by inverting the analogue output characteristic (see function no. 16 and 17).
100% (20 mA)
0% (4 mA)
100% (20 mA)
0% (4 mA)
+U
B
Q
1
-U
B
Illustr. 15
15500153
32
= +U
1
1
2
1
2
A B A
100% (20 mA)
50% (12 mA)
0% (4 mA)
t(s)
Illustr. 14
15500145
, this function detects the maximum value of the measuring signal and
B
14 mA
1
2 8 mA
Q = +U
A
1
B
Q = -U
1
B
80 120 190
= Sample. Collect measured values
B
= Display. Last maximum of analogue signal at
B
analogue output
Festo SOEL-...0608b English
Autom. centre at 120 mm
mm
300