VEGA VEGASEL 543, 544, 545, 546, 547 - Manual (Page 10)

10 VEGASEL
Electrical connections
Transistor outputs in conjunction with a DCS/PLC
The resistor R
S
is used as current limitation to 60 mA
Example:
U
B
= 24 V, U
CE
≤ 1,5 V, I
B
= max. 60 mA
U
B
– U
CE
24 V – 1,5 V
R
S
= ––––––––– = –––––––––––– = 375 Ω , selected 390 Ω
I
B
60 mA
Dissipated energy P
V
= I 2 • R
S
= 60 mA 2 • 390 Ω = 1,404 W, selected 1,5 W
Example of a measuring system with VEGASEL 544
+
-
-
+
+
- +
I
B
R
S
E 1.0
E 1.1
U
B
U
CE
I
B
U
CE
R
S
VEGATOR 544 DCS/PLC
e.g. magnet valve
e.g. pump
VEGASEL 544 VEGAMET 513
Pressure
transmitter
2
6
20
10
18
d b z
+
-
2
20
18
30
32
d b z
+
-
+
-
+
-
+
-
+
-
1 +
+
-
2 -
L
N
Schedule
U
B
R
S
5 V 58 Ω
12 V 180 Ω
24 V 390 Ω
36 V 680 Ω