Rotex Controller Series, Product Documentation

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EbV Product documentation THETA NORM/UNIT
2-3
• All data bus cables must be carried out in shielded version.
Suggested version, see technical specifications on page 14-1
• The shielding of the cable has to be connected with earth potential to one side , i.e. boiler covering,
connecting terminals for earth potential etc. Multiple grounding is not permitted (humming loop).
• In star shaped networks it is not permitted to ground cables on both sides. They should be grounded in
the centre.
• The outside sensor may not be installed close to transmitter- or receiver-equipment (on garage walls
close to receivers for radio-controlled garage door openers, ham operator antennas, radio controlled
alert systems or close to big radio transmission plants).
2.4 Cable dimensions and maximum cable length
• For all 230V~ cables such as power supply, burner, pumps, actuators: 1,5 mm
2
Maximum cable length:
Unlimited cable length within house installation.
• Data bus connections: 0.6 mm
2
Recommended cables:
J-Y(St)Y 2 x 2 x 0.6 mm
2
Maximum cable length: 50 m
Longer distances should be avoided to decrease the risk of interferences.
• For all low voltage cables such as sensors, extern selectors, bus and analogue in- and outputs, heat
requiring by means of extern contact, modem connection cables, etc.: 0.5 mm
2
Maximum cable length: 50 m
Longer distances should be avoided to decrease the risk of interferences.
Fig. 4: Single grounding of shielding
Do not ground here!
Heat generator
PE
Shielding
2-wire
data bus line
Distribution terminal
Distribution box
PE
Fig. 5