Uni-I/O™
Unitronics
5
All wiring activities should be performed while power is OFF.
Use over-current protection, such as a fuse or circuit breaker, to avoid excessive
currents into the UIS-08TC supply port.
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 2 –3.31 mm2).
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.
UIS-08TC Connection Points
All wiring diagrams and instructions in this
document refer to the UIS-08TC connection
points.
These points are arranged in four groups of
seven points as shown in the figure to the right.
Two top groups
Input connection points (0,1,2,3)
Two bottom groups
Input connection points (4,5,6,7) and power
supply connection points
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 shielded cables for wiring thermocouple signals and shielded twisted pair cables for
wiring analog input voltage signals;
do not use the cable shield as a signal common / return path.
It is recommended to short unused analog inputs (Tx- to Tx+).
Route each I/O signal with its own dedicated common wire.
Connect common wires at
their respective common points (Tx-) at the I/O module.
Individually connect each functional ground point ( ) to the earth of the system
(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
2
).
