fluenta FGM 160 - Figure 42: Current Loop Outputs, Details; Table 2: Min.;Max. Loop Resistance at Typical Loop Voltages

FGM 160 Installation and Hook-Up Instructions
62.120.001
Page 33 of 40
6.2.5.4.3 Current Loop Outputs Details
The current loop outputs of the FGM 160 are galvanic
isolated from the rest of the FGM 160 field computer.
However, they are not individually isolated with respect
to each other (they all share the same ground reference
point).
The outputs are protected against reverse polarity.
See Figure 42 for detailed schematic of the current loop
outputs.
6.2.5.4.4 Load / Loop Voltage
Limitations
A typical load resistor value is 250Ω.
This value gives a voltage on the DCS input within the
range of 1 – 5V.
Active Output Configuration
In active output configuration, the loop voltage is 30V.
Minimum loop resistance: 100Ω.
Maximum loop resistance: 1350Ω.
Passive Output Configuration
Minimum loop voltage: 5V.
Maximum loop voltage: 50V.
Minimum loop resistance:
- Loop voltage < 30V: R
loop
min. = 100Ω.
- Loop voltage > 30V:
R
loop
min. = (Loop voltage - 28V) x 50 [Ω].
Maximum loop resistance:
R
loop
max. = (Loop voltage - 3V) x 50 [Ω].
Table 2: Min./max. loop resistance at typical loop
voltages.
Loop voltage
R
loop
min.
R
loop
max.
12 V
100 Ω
450 Ω
24 V
100 Ω
1050 Ω
30 V
100 Ω
1350 Ω
36 V
400 Ω
1650 Ω
48 V
1000 Ω
2250 Ω
Figure 42: Current loop
outputs, details