44
13 Supplement
VEGABAR 28 • Three-wire 1 x transistor or 4 … 20 mA
57534-EN-220826
Starting current for run-up time
≤ 3.6 mA
Output variable - three-wire 4 … 20 mA
Output signal
4 … 20 mA (active)
Connection technology
Three-wire
Range of the output signal
3.8 … 20.5 mA (default setting)
Signal resolution
5 µA
Fault signal, current output (adjustable) Last valid measured value, ≥ 21 mA, ≤ 3.6 mA (Default)
Max. output current
21.5 mA
Load
See load resistance under Power supply
Output variable - Three-wire 1 x transistor
Output signal
Transistor PNP or NPN can be configured
Connection technology
Three-wire
Load current
max. 250 mA
Overload resistance
yes
Short-circuit resistance
Permanently
Voltage loss
< 3 V
Inverse current PNP
< 10 µA
Inverse current NPN
< 25 µA
Dynamic behaviour output
Dynamic characteristics - Current output
90 %
100 %
10 %
t
t
T
A
t
t
S
2
1
Fig. 27: Behaviour the current output in case of sudden change of the process variable. t
T
: dead time; t
A
: rise time;
t
S
: jump response time
1 Process variable
2 Output signal
Size
Time
Dead time
≤ 2 ms
Rise time (10 … 90 %)
≤ 4 ms
Step response time (ti: 0 s, 10 … 90 %)
≤ 6 ms