[MI 019-100] Universal Instruction Manual I/A Series Mass Flow ...

2. Installation MI 019-100 – December 2003
Output
Signal
Code
Terminal
5
Table 7. Input/Output Wiring Connections
Terminal
6
Terminal
4
Terminal
4.1
Terminal
4.2
1
Contact Input Pulse Output Contact Output
2 Contact Input Current Output 2 Contact Output
C
Current
Current Output 2 Contact Input Pulse Output
Common Output
D
1
Current Output 2 Current Output 3 Pulse Output
E
Current Output 2 Current Output 3 Contact Input
F
Current Output 2 Current Output 3 Contact Output
NOTE
The CFT50 Transmitter output circuits are externally powered. The most common
power supply voltage is 24 V dc.
Current Outputs
A wiring diagram for a Current Output is shown in Figure 10.
POSITIVE POWER INPUT
TERMINAL (5)
+ –
24 V DC
CURRENT OUTPUT
TERMINAL (6, 4, OR 4.1)
LOOP
+
LOAD* –
*FOR EXAMPLE, AI MODULE
Figure 10. Current Output
The loop load vs voltage relationship is:
R MAX = (V-10)/0.0205.
A minimum of 10 V must be maintained across the transmitter terminals for proper operation.
To determine the maximum loop load resistance, add the series resistance of each component in
the loop, excluding the transmitter.
Figure 11 shows the output load vs voltage relationship from 10 to 24 volts.
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