Carel k.Air, User Manual, Page: 18 / 192

18
Hardware installation
k.air +030220981 rel. 1.2 - 01.12.2020
3.6 Universal input/output connections
3.6.1 Universal inputs/outputs
The universal inputs/outputs are marked with the letter U ... and can be confi gured in the application program as:
• passive temperature probes: NTC;
• 0-10 Vdc active probes;
• 4-20 mA current inputs;
• digital inputs with voltage-free contacts;
• 0-10 Vdc analogue outputs.
Important : universal inputs/outputs cannot be used as digital outputs.
Maximum number of analogue inputs that can be connected
The maximum number of analogue inputs that can be connected to the universal inputs/outputs depends on the type.
S ignal type k. A ir mini k. A ir large c.p CO e
CAREL NTC probes (-50T90°C, R/T 10 kΩ±1% at 25°C) 10 10 10
0- 1 Vdc/0- 10 Vdc signals from probes powered by the controller 0 max tot
10
max. 6 0
0-1 Vdc/0-10 Vdc signals from probes powered externally 10 10 10
4-20 mA inputs from probes powered by the controller Max
tot 4
Max 2
(*)
Max
tot 9
Max. 6 Max
tot 4
Max. 2
(*)
4-20 mA inputs from probes powered externally Max 4 Max 9 Max. 4
Tab. 3.c
(*)Excluding DP**Q and DP****2 probes
Note:
the table indicates the maximum number of inputs that can be connected. For example, with k.Air mini, a maximum of
two 4- 20 mA inputs from probes powered by the controller and a maximum of four 4-20 mA inputs probes powered externally
can be connected. The maximum total number of inputs of both types is however four.
Remote control of analogue inputs
The cable sizes for the remote control of the analogue inputs are shown in the following table:
Input type S ize for length < 50 m (mm2) S ize for length < 100 m (mm2)
NTC 0.5 1
PT1000 0.75 1.5
I (current) 0.25 0.5
V (voltage) 0.25 0.5
Tab. 3.d
Important:
• if the controller is installed in an industrial environment (standard EN 61000- 6-2), the length of the connections must be less
than 10 m; do not exceed this length so as to avoid measurement errors;
• separate as much as possible (at least 3 cm) the probe and digital input cables from cables to loads and power cables, so as to
avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel cables) and probe signal
cables in the same conduits.
Connection of NTC temperature probes
See the table at the beginning of the paragraph for the maximum number of probes that can be connected. For the operating
range, see the technical specifi cations table in 0300057EN.
30220980_031_R01
2
1
3
4
C ontroller
terminals
N T C probe
1 2 3 4
GND Wire 1
U1 Wire 2
GND Wire 1
U2 Wire 2
GND Wire 1
U4 Wire 2
GND Wire 1
U5 Wire 2
Tab. 3.e
Fig. 3.k