Contrec 515 FA01, Operation Manual

Page: 25 / 98

Installation & Maintenance
515 FA01 - 29 August 2021 15
4-20 mA Inputs
For an externally powered current loop, connect the transmitter to the input
terminals as shown in Figure 8. Refer to
Terminal Designations on page 11
for specific terminal numbers for this application.
Figure 8 Externally Powered Current Loop
The internal overload-protected power supply has sufficient power for three
current loops at 24 V DC (more current loops can be supplied by using a
reduced voltage setting). Connect internally powered current loops as
shown in Figure 9.
Figure 9 Internally Powered Current Loops
Logic Input Connection
These input(s) are designed to be connected to CMOS, TTL, open collector
signals or a voltage free contact switch. A minimum activation time of
300ms is required to guarantee reading of an input.
It is possible to read the status of all the logic inputs via a Modbus register
even if they are not used for a control purpose in the application.
+
-
Transmitter
Analog
Input
(AINPn)
+
-
15
+
+
- Analog
Input
+
+
-
Analog
Input
Vo +8...24V DC
(AINPn)
(AINPn)
Transmitter
Transmitter