Setra System 267MR - Manual (Page 7)

3.3 Current Output Units - 1/2’’ Conduit Opening, PG9 or PG-13.5 Electrical
Termination
The Model 267 and 267MR is a two-wire loop-powered 4 to 20mA current
output unit (see Diagram 5). The current flows into +EXC. terminal and returns
back to the power supply through the -EXC. terminal (see Diagram 6). The
power supply must be a DC voltage source with a voltage range between 9
and 30 measured between terminal +EXC. and -EXC. The unit is calibrated with
a 24VDC loop supply voltage and a 250 ohm load.
4
Electrical
Connections Range Select Switches
(267MR version only)
Diagram 5
+EXC -
Span
Zero
CONNECTION
9 pin D-sub Connector
Electrical Termination
+EXCITATION 4
+OUTPUT 1
COMMON 9
Diagram 4
Diagram 3
Excitation Output
9 to 30 VAC / 11.5 to 42 VDC 0 to 5 VDC
12 to 30 VAC / 13 to 42 VDC 0 to 10 VDC
PIN 8, 9
COMMON
PIN 4
+EXC
PIN 1
+ OUTPUT
3.2 Voltage Output Units - 9 pin D-sub Connector Electrical Termination
The Model 267 and 267MR voltage output is a 3-wire circuit, with three pins avail-
able for wiring (see Diagram 3). The voltage output pin designations are shown in
Diagram 4:
267MR
9 to 30 VDC
+
_
Current
Monitor
Devce
8, 9
Diagram 6
*Pins 8 and 9 are internally commoned together, user can connect to either pin.