ABB DCS800 Series Installation Manual page 44

44
D6 / D7 grounding of cable screens
A double shielded twisted pair cable (see
Cables, Finland) must be used for analogue signals and the pulse encoder signals.
Employ one individually shielded pair for each signal. Do not use common return for
different analogue signals.
A double shielded cable is the best alternative for low voltage digital signals but
single shielded twisted multi pair cable (see
A double shielded twisted pair cable
Twisted pair cables
Pairs should be twisted as close to terminals as possible.
The analogue and digital signals should be run in separate, screened cables.
Relay-controlled signals, providing their voltage does not exceed 48 V, can be run
in the same cables as digital input signals. It is recommended that the relay-
controlled signals be run as twisted pairs too.
Caution:
Never mix 24 VDC and 115 / 230 VAC signals in the same cable!
Electrical Installation
a
3ADW000352R0101 DCS800-A Installation Manual e a
Connection of a cable
screen with the aid of
metal clamp to the metal
surface of the PCB
carrier at a DCS converter
Size D6, D7
Screen connection
Twisted pair cables a), e.g. JAMAK by NK
Twisted pair cables
b
A single shielded twisted multi pair cable
b) is also usable.