VEGA VEGABAR 61 Profibus PA User Manual
Page 54
Dynamic behaviour output
Run-up time approx.
10 s
90 %
100 %
10 %
t
t
T
A
t
t
S
2
1
Fig. 28: Sudden change of the process variable, dead time t
T
, rise time t
A
and step response time t
S
1
Process variable
2
Output signal
Dead time
≤
150 ms
Rise time
≤
100 ms (10 … 90 %)
Step response time
≤
250 ms (ti: 0 s, 10 … 90 %)
To this amounts the reaction time of the isolatng system. This time varies from values < 1 s with
compact isolating diaphragms up to several seconds with capillary systems.
Example: Flange isolating diaphragm DN 80, filling silicone oil KN 2.2, capillary length 10 m,
measuring range 1 bar
Process temperature
Reaction time
40 °C
approx. 2 s
20 °C
approx. 3 s
-20 °C
approx. 11 s
Damping (63 % of the input variable)
0 … 999 s, adjustable
Input variable
Adjustment
Adjustment range of the min./max. adjustment relating to the nominal measuring range:
-
percentage value
-10 … 110 %
-
pressure value
-20 … 120 %
54
VEGABAR
61 • Profibus PA
10 Supplement
28251
-EN
-081209