R3-US4
P. 2 / 2
EM-8449 Rev.1
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
■
DIMENSIONS mm (inch)
WIRING INSTRUCTIONS
■
SOLDERLESS TERMINAL mm (inch)
Refer to the drawing below for recommended ring tongue
terminal size. Spade tongue type is also applicable. Solder-
less terminals with insulation sleeve do not fit. Applicable
wire size: 0.3 – 0.75 mm
2
3.2 (.13) dia.
4 min.
(.16)
12 (.47) max.
6 max.
(.24)
3 (.12) max.
■
CONNECTION DIAGRAM
1
12
14
16
18
19
20
3
5
7
9
10
13
15
17
11
2
6
8
4
POSITIONING
GUIDE
109 (4.29)
20–M3
SCREW
TERMINAL
COVER
6.2
(.24)
130 (5.12)
27.5 (1.08)
CJC SENSOR
(4 CJMs)
■
RTD
■
POTENTIOMETER
■
THEMOCOUPLE
•
Upscale/no burnout
•
Downscale burnout
–
–
+
+
■
DC VOLTAGE
+
-
B
A
B
INPUT CONNECTION
C
B
C
B
A
■
TERMINAL NETWORK
C
B
A
2
1
11
4
3
13
6
5
15
8
7
17
A
B
C
A
B
C
A
CJC
Sensor
–
+
-
C
B
A
CJC
Sensor
11
+
–
3
2
1
MAX
MIN
+
1
2
INPUT 1
13
3
4
INPUT 2
15
5
6
INPUT 3
17
7
8
INPUT 4
BUS CONNECTOR
INTERNAL
POWER
BUS A
BUS B
*
*
For dual redundant communication.
INPUT 4
INPUT 1 INPUT 2
INPUT 3
comp.wire
comp.wire
Note 1: Remove CJC sensor for RTD or potentiometer input. The CJC sensor does not affect to DC voltage input.
Note 2: Be sure to eliminate noise as much as possible by e.g. using shielded cables. Ground the signal shield to
a most stable earth point in the environment.
Note 3: The temperature imbalance around the terminal affects greatly the cold junction compensation accuracy.
In order to minimize such imbalance, do not expose the input terminals directly to the wind from a cooling fan.
