9
2.2 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).
2.3
Sensor Input (Measuring Input)
•
Do not run input wires with power cables
•
When shielded cable is used, it should be
grounded at one point only
•
Any external components (such as zener
barriers) connected between sensor and input
terminals may cause errors in measurement
due to excessive and/or un-balanced line
resistance, or leakage currents.
•
Not isolated from the logic outputs & digital
inputs.
Thermocouple Input
!
Use the correct
compensating
cable, preferably
shielded.
RTD Input
PRT
PRT
Lead
compensation
•
The resistance of the three wires must be the
same. The line resistance may cause errors if
it exceeds 22
Ω
.
Linear mA, mV or Voltage Inputs
+ Positive
- Negative
-
•
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.
V+
V-
-
Negative
+
Positive
VI
V+
V-
2.49
Ω
V+
V-
