User manual

ENGLISH

ir33 +030220441 - rel. 2.5 - 16.06.10

3. INSTALLATION

To install the controller, proceed as follows, with reference to the connection diagrams shown in the manual on electrical

speci cations and connections:

1. connect the probes and power supply: the probes can be installed up to a maximum distance of 10 m from the controller,

using shielded cables with a minimum cross-section of 1mm. To improve the 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 instrument: for more details, see the chapter “Programming the instruments”.

3. Connect the actuators: the actuators should only be connected after having programmed the controller. In this connection,

carefully check the maximum capacities of the relays, indicated in the “technical speci cations”.

4. Serial network connection: all ir33 models are  tted with a serial connector for connection to the supervisory network

via the serial interface code IROPZ48500. The secondary winding of the transformers that supply the instruments must not

be earthed. If connection to a transformer with earthed secondary winding is required, an insulating transformer must be

installed in between.

It is necessary to use a transformer for each instrument; a series of instruments can NOT be connected to the same

transformer.

Warnings:

Avoid installing the instrument 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. 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. When tightening the screws, do not use automatic screwdrivers, or adjust the screws to

a tightening torque less than 50 Ncm;

• separate as much as possible (by at least 3 cm) the probe signal and digital input cables from inductive loads and power cables,

to avoid any electromagnetic disturbance. Never lay power cables 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;

• only use IP67 guaranteed probes as end defrost probes; place the probes with the vertical bulb upwards, so as to facilitate drai-

nage of any condensate. Remember that the thermistor temperature probes (NTC) have no polarity, so the order of connection

of the ends is not important.

Cleaning the instrument

When cleaning the instrument do not use ethanol, hydrocarbons (petrol), ammonia and by-products.

Use neutral detergents and water.