Example of a measuring system with vegasel 544 – VEGA VEGASEL 543, 544, 545, 546, 547 User Manual
Page 10
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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
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