User manual for - INDICATOR SWE-73-T
Figure 4.5. Terminals description
All connections must be made while power supply is disconnected !
Figure 4.6. Connection of power supply
a) for 230V AC version; b) for 24V DC version
Temperature sensor can be connected to the device in typical 4-wire circuit (Figure 4.7 a),
3-wire circuit (Figure 4.7 b) or 2-wire circuit (Figure 4.7 c). Due to precision of measurement
4-wire circuit is recommended.
If 2-wire circuit is used, the resistance of wires should be as small as possible, to
avoid of measurement errors. Measured value can be corrected (constant
correction) using „
toFS
” parameter from menu „
inPt
”. Due to low precision 2-wire
connection is not recommended.
When 4- or 2-wires connection is used, the resistance of particular wires (Ra ÷ Rd)
CAN
BE DIFFERENT.
When 3-wires connection is used, the resistance of particular wires
(Ra ÷ Rd)
MUST BE IDENTICAL
to enable proper compensation of it's resistance. The
resistance of particular wire
should not be greater than 20
W
.
10
!
9 10
GND
DATA+
DATA-
RS - 485
1 2 3 4 5 6 7 8
n.c.
Power
supply
(depending on version)
Pt100/500/1000
Pt100/500/1000
7 8 9 10
n.c.
Pt100/500/1000
7 8 9 10
n.c. n.c
FUSE
230V AC
L N
L N
1
2
a)
FUSE
+
-
24V DC
1
2
+
-
b)
i
