- Avoid installating probe cables near power devices (Magnetothermic contactors or others).
- Probes can be positioned up to a maximum distance of 100 meters from the controller,
provided that their cables have a minimum section of 1mm
2
and are shielded.
- To improve immunity against noise and to get a better precision, w
e advise using shielded
cables; in this case, connect just one end of the shielding to the electrical panel
ground; do not connect the other end of the cable.
When usign thermocouples, it is necessary to use shielded cables to ensure protection
against noise; moreover, the probes can be lengthened only by using the suitable
compensated cables and connectors.(As for codes see Carel price-list).
- If a supervisory network connection is provided through suitable serial boards (IR32SER
for IR32 models and IRDRSER for IRDR models), it is necessar
y to pay attention to the
earthing of the system. In particular: the secondary of the transformers which feed the
instruments should not be earthed. If it is necessary to connect to a transformer with a
earthed secondary, an isolating transformer should be used. Even if it is possible to
connect more instruments to the same insulation transformer, we suggest you to use a
different insulation transformer for each instrument (see Carel price list for the codes and
specifications of the insulation transformers).
38
Hints for optimum installation
+05-3015 • rel.3.0 interno ok 18-09-2002 14:31 Pagina 38
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