Chapter 3 – Electrical Installation
3-4 ACS/ACC/ACP 601 Frequency Converters
Control Cables
All control cables must be shielded. As a general rule, the control
signal cable shield should be earthed directly in the ACx 600. The other
end of the shield should be left unconnected or earthed indirectly via
some nanofarad high frequency and high voltage capacitor (e.g. 3.3 nF
/ 3000 V). The screen can also be earthed directly at both ends if they
are
in the same earth line
with no significant voltage drop between the
end points.
Twisting the signal wire with its return wire reduces disturbances
caused by inductive coupling. Pairs should be twisted as close to
terminals as possible.
A double shielded twisted pair cable (Figure a, e.g. JAMAK by NK
Cables, Finland) must be used for analogue signals and is
recommended for 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 multipair cable (Figure b) is also
usable.
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.
Never mix 24 VDC and 115 / 230 VAC signals in the same cable.
Relay Cable
The cable type ÖLFLEX (braided metallic screen, LAPPKABEL,
Germany) has been tested and approved by ABB Industry.
Encoder Cable (ACP 600)
Min. 4 · 0.25 mm
2
+ 2 · 0.5 mm
2
, min. single shielded twisted multipair
cable, optical coverage > 91 %. The maximum cable length is 150 m.
Suitable cable is available from ABB.
Control Panel Cable
In remote use the cable connecting the Control Panel to the ACx 600
must not exceed 3 metres. The cable type tested and approved by
ABB Industry is used in Control Panel option kits.
D
A double shielded twisted
pair cable
b
A single shielded twisted
multipair cable
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