38 Installation requirements
Control cable requirements
Use shielded control and data cables.
A double-shielded cable is the best alternative for low-voltage digital signals over
several communication cables, but a single-shielded twisted-pair cable can also be
used.
Do not mix 24 V
DC
and 115/230 V
AC
signals in the same cable.
Relay-controlled signals can share the same cables as digital signals, if their voltage
does not exceed 48 V. Run relay-controlled signals as twisted pairs.
Communication signals can share the same cable, if the data conductors run in the
same twisted pair and both interfaces have separate ground conductors.
Route control cables according to Cable routes on page 52.
Recommended relay cable
Cables with a braided metallic screen (for example, Lapp Kabel ÖLFLEX or
equivalent) have been tested and approved by ABB.
Recommended cable for Modbus over EIA/RS-485
Use a shielded twisted-pair cable (STP) with an impedance of 100…150 ohm with
120 ohm terminating resistors. For example, Lapp Kabel UNITRONIC
®
LiHCH (TP)
or equivalent.
Recommended cable for remote control unit interface over
EIA/RS-485
Use a shielded twisted-pair (STP) cable (for example, Lapp Kabel UNITRONIC
®
LiHCH (TP) or equivalent). Terminating resistors are not required.
Double-shielded twisted-pair cable Single-shielded twisted-pair cable
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