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ENG
ir33 universale +030220801 - rel. 2.1 - 21.06.2011
2.7 Installation
To install the controller, proceed as follows, with reference to the wiring
diagrams:
1. connect the probes and power supply: the probes can be installed
up to a maximum distance of 100 m from the controller, using
shielded cables with a minimum cross-section of 1 mm. To improve
immunity to disturbance, use probes with shielded cables (connect
only one end of the shield to the earth on the electrical panel).
2. Program the controller: see the chapter “User interface”.
3. Connect the actuators: the actuators should only be connected
after having programmed the controller. Carefully check the
maximum relay capacities, indicated in “technical speci cations”.
4. Serial network connection: if connection to the supervisor network
is available using the relevant serial cards (IROPZ485*0 for IR33
and IROPZSER30 for DN33), make sure the system is earthed. On
controllers with 0 to 10 Vdc analogue outputs (models B and E) make
sure there is only one earth connection. Speci cally, the secondary
of the transformers that supply the controllers must not be earthed
(temperature only models). If connection to a transformer with
earthed secondary winding is required, an insulating transformer
must be installed in between. A series of controllers can be connected
to the same insulating transformer, nevertheless it is recommended
to use a separate insulating transformer for each controller.
Case 1: a series of controllers connected in a network powered by the
same transformer (G0 not earthed). Typical application for multiple
controllers connected inside the same electrical panel
230 Vac
24 Vac
Fig. 2.d
Case 2: a series of controllers connected in a network powered by
di erent transformers (G0 not earthed). Typical application for multiple
controllers in di erent electrical panels.
230 Vac
24 Vac
230 Vac
24 Vac
230 Vac
24 Vac
Fig. 2.e
Avoid installing the controller in environments with the following
characteristics:
• relative humidity over 90% non-condensing;
• heavy vibrations or knocks;
• exposure to continuous jets of water;
• exposure to aggressive and polluting atmospheric agents (e.g.: sulphur
and ammonia gases, saline mist, smoke) which may cause corrosion
and/or oxidation;
• high magnetic and/or radio frequency interference (e.g. do not install
near transmitting antennas);
• exposure to direct sunlight and atmospheric agents in general.
The following warnings must be observed when connecting the
controllers:
• incorrect connection of the power supply may seriously damage the
system;
• use cable ends that are suitable for the terminals. Loosen every screw
and t the cable end, next tighten the screws and gently pull the
cables to check their tightness;
• separate as much as possible (at least 3 cm) the probe and digital
input cables from inductive loads and power cables, to avoid any
electromagnetic disturbance. Never lay power and probe cables in the
same cable conduits (including those for the electrical panels);
• do not install the probe cables in the immediate vicinity of power
devices (contactors, circuit breakers or the like). Reduce the length of
the sensor cables as much as possible, and avoid spirals around power
devices;
• avoid supplying the controller directly from the main panel power
supply if also supplying power to other devices, such as contactors,
solenoid valves, etc., which require another transformer.
IR33 is not a device that guarantees electrical safety, but rather
suitable operation: to prevent short-circuits or overloads from
causing hazards, the customer must install appropriate electromechanical
protection devices on the lines in question (fuses or the like).
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