Unitronics Uni-I/O UIS-04PTN Installation Manual page 5

 All wiring activities should be performed while power is OFF.
 Unused points should not be connected (unless otherwise specified). Ignoring this
directive may damage the device.
 Double-check all wiring before turning on the power supply.
Caution  To avoid damaging the wire, use a maximum torque of 0.5 N·m (5 kgf·cm).
 Do not use tin, solder, or any substance on stripped wire that might cause the
wire strand to break.
 Install at maximum distance from high-voltage cables and power equipment.
Wiring Procedure
Use crimp terminals for wiring; use 26-12 AWG wire (0.13 mm
1. Strip the wire to a length of 7±0.5mm (0.250–0.300 inches).
2. Unscrew the terminal to its widest position before inserting a wire.
3. Insert the wire completely into the terminal to ensure a proper connection.
4. Tighten enough to keep the wire from pulling free.
Uni-I/O™ Connection Points
All wiring diagrams and instructions in this
document refer to the Uni-I/O™ connection
points.
These points are arranged in two groups of 2
points as shown in the figure to the right.
Top group
Input connection points (0-1)
Bottom group
Input connection points (2-3)
Wiring Guidelines
In order to ensure that the device will operate properly and to avoid electromagnetic
interference:
 Use a metal cabinet. Make sure the cabinet and its doors are properly earthed.
 Use wires that are properly sized for the load.
 Use shielded cables for wiring RTD signals;
do not use the cable shield as a signal common (CM) / return path.
 Individually connect each functional ground point (
(preferably to the metal cabinet chassis).
Use the shortest and thickest wires possible: less than 1m (3.3') in length, minimum
thickness 14 AWG (2 mm
 Earthing the cables' shield:
Connect the cable shield to the earth of the system - preferably to the metal cabinet

chassis. Note that the shield must be connected only at one end of the cable;
typically, earthing the shield at the Uni-I/O™ end performs better.
Keep shield connections as short as possible.

Ensure shield continuity when extending shielded cables.

Unitronics
2
).
2
–3.31 mm
) to the earth of the system
Uni-I/O™
2
).
5