Carel k.Air, User Manual, Page: 16 / 192

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Hardware installation
k.air +030220981 rel. 1.2 - 01.12.2020
3.3 Installation
Environmental conditions
Avoid installing the controller and terminal in environments with the following conditions:
• exposure to direct sunlight and the elements in general;
• temperature and humidity outside of the values allowed for the operation of the product (see the technical specifi cations
table in 0300057EN);
• wide and rapid fl uctuations in ambient temperature;
• strong magnetic and/or radio frequency interference (thus avoid installation near transmitting antennae);
• strong vibrations or knocks;
• in the presence of explosives or fl ammable gas mixtures;
• exposure to aggressive and polluting atmospheres (e.g.: sulphur and ammonia gases, saline mist, smoke) which may cause
corrosion and/or oxidation;
• exposure to dust (formation of corrosive patina with possible oxidation and reduction of insulation);
• exposure to water.
Positioning the controller inside the panel
The controller must be installed inside an electrical panel and must not be accessible, to avoid impact. The position in the
electrical panel must be chosen so as to guarantee correct physical separation from the power components (solenoids,
contactors, actuators, inverters, ...) and the connected cables. The ideal solution is to house these two circuits in two separate
cabinets. Proximity to such devices/cables may create random malfunctions that are not immediately evident. The structure of
the panel must allow the correct fl ow of cooling air.
Important:
• for safety reasons, the equipment must be housed inside an electrical panel so that the only accessible parts are the display
and the keypad on the built-in terminal;
• the controller must be installed in such a way as to simplify operations on the disconnection devices;
• when wiring, separate as much as possible the probe, digital input and serial line cables from the power device cables (con-
tactors, circuit breakers and the like) to avoid possible electromagnetic disturbance;
• never run power cables (including the electrical cables) and probe signal cables in the same conduits;
• for the control signals, it is recommended to use shielded cables with twisted wires. If the controller cables have to cross over
the power cables, the intersections must be as near as possible to 90 degrees, always avoiding running the controller cables
parallel to the power cables;
• reduce the path of probe cables as much as possible, and avoid spiral paths that enclose power devices;
• in the event of any malfunctions, do not attempt to repair the device, rather contact a CAREL service centre.
Electrical installation
Important: before carrying out any maintenance, disconnect the controller from the power supply by moving the main
system switch to “off ”.
Provide a power disconnect device in compliance with current regulations. Use cable ends suitable for the corresponding
terminals. Loosen each screw and insert the cable ends, then tighten the screws. There is no limit to the number of wires that
can be inserted into a single terminal. The maximum tightening torque for the screws on the 5.08 mm pitch terminals is 0.4 Nm
and on the 3.81 m pitch terminals is 0.2 Nm.
For the maximum length of the connections of the analogue/digital inputs and the analogue outputs, see the table of technical
specifi cations (in manual +0300057EN). For environments with strong disturbance, it is recommended to use shielded cables
with the shield connected to the earth in the electrical panel. When the operation is completed, slightly tug the cables to check
they are suffi
ciently tight.
Notes:
• fi x the cables connected to the controller using cable ties, placed around 3 cm from the connectors;
• if the power supply transformer secondary is earthed, make sure that the earth wire is connected to the wire that runs to
the controller and is connected to terminal G0. Follow this instruction for all devices connected to controller via the serial
network.
Important:
• a power supply voltage other than that specifi ed may seriously damage the system;
• the fuse must be located near the controller;
• installation and maintenance/inspection of the controller are operations reserved exclusively for qualifi ed technical personnel,
in compliance with current national and local regulations;
• all of the extra low voltage connections (24 Vac or 28-36 Vdc analogue and digital inputs, analogue outputs, serial bus con-
nections, power supplies) must have reinforced or double insulation from the mains network;
• avoid touching or nearly touching the electronic components fi tted on the boards to avoid electrostatic discharges (extre-
mely damaging) from the operator to the components;
• do not exert excessive force with the screwdriver on the connectors to avoid damaging the controller;
• if the device is used in a way not specifi ed by the manufacturer, the protection provided may be compromised;
• only install optional cards and connectors supplied by Carel.