3200 Series
10 Part No HA028651 Issue 7.0 Apr-09
2.4
Wire Sizes
The screw terminals accept wire sizes from 0.5 to 1.5 mm
(16 to 22AWG). Hinged covers prevent hands or metal
making accidental contact with live wires. The rear
terminal screws should be tightened to 0.4Nm (3.5lb in).
2.5
Precautions
•
Do not run input wires together with power cables
•
When shielded cable is used, it should be grounded
at one point only
•
Any external components (such as zener barriers,
etc) connected between sensor and input terminals
may cause errors in measurement due to excessive
and/or un-balanced line resistance or possible
leakage currents
•
Not isolated from the logic outputs & digital inputs
•
Pay attention to line resistance; a high line resistance
may cause measurement errors
2.6
Sensor Input (Measuring Input)
2.6.1
Thermocouple Input
Positive
Negative
•
Use the correct compensating cable preferably
shielded
2.6.2
RTD Input
PRT
PRT
Lead compensation
•
The resistance of the three wires must be the same.
The line resistance may cause errors if it is greater
than 22
Ω
2.6.3
Linear Input (mA or mV)
•
If shielded cable is used it should be grounded in
one place only as shown
•
For a mA input
connect the 2.49
Ω
burden resistor
supplied between the V+ and V- terminals as shown
•
For a 0-10Vdc input an external input adapter is
required (not supplied). Part number: SUB21/IV10
Sensor break alarm does not operate with this adaptor
fitted.
2.6.4
Two-Wire Transmitter Inputs
100K
Ω
806
Ω
+
0-10V
Input
-
+
-
-
+
V+
V-
VI
V+
V-
-
2.49
Ω
+
V+
V-
Shield
+
mA / mV input
-
Using internal 24V power supply (3208, 32h8 and 3204 only)
-
+
V+
V-
-
+
2-Wire
Transmitter
-
+
2.49
Ω
3C
3D
Using external power
supply
+
-
External power
supply
-
+
2-Wire
Transmitter
-
+
2.49
Ω
V+
V-