ABB ACS2000 User Manual page 66

66 A C S 2 0 0 0 , 4 K V U S E R M A N U A L
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Single-core cables
84
Shielded single-core cables may be used, provided
Trefoil arrangement
of single core cable
they are installed in a trefoil arrangement in order
to prevent the occurrence of motor-bearing
currents.
The maximum installed single-core, trefoil cable
arrangement should not exceed 100 meters [328
feet]. Ground the shields at both ends.
Ampacity rating
The ampacity rating of the line supply cables
should be consistent with the percent required by
national and local codes of the rated current of the
drive being supplied, and the protection settings
of the protection equipment.
The ampacity rating of the motor cables should be
consistent with the size of the motor being
supplied and the overload settings of the motor
protection software.
Derating of cable ampacity in accordance with
maximum expected ambient temperature, raceway
fill factors, external heat sources, and any other
factors required by local electrical codes
should be applied.
Installation
Installation should be in compliance with national
codes, local codes, and standard industry practice
for medium voltage equipment.
Ground cable
It is important that the drive is properly grounded
to maintain safety and to ensure reliable
functioning of the equipment.
The ground cable must be securely tied to the
ground system of the installation site and to the
ground bus closest to the cable entry of the drive
per national and local code requirements. See
section Ground cable and cable shield
connections for further information.
Cross-section
The cross-section of the ground cable and the
ground connection must be in compliance with
national and local electrical codes. Recommended
minimum cross-section of ground cable: 50 mm²
[1/0 AWG].
Bonding conductor
If the cross-sectional area of the shielding of the
cables between the drive and the motor is less than
half the cross-sectional area of that cable, an extra
bonding conductor is required. Running the
bonding conductor in parallel to the power
cables is recommended to prevent shield
overloading due to potential differences
in the plant. See section Ground cable
and cable shield connections for further
information.
Cross-section (Bonding conductor)
The cross-section and ampacity rating of the
conductor and the connection must be in
compliance with national and local electrical codes.
Auxiliary power cables
A three phase 480 V cable is required for the
standard auxiliary power supply (other voltages
available by option). A neutral connector is not
required. Type and rating is to be selected
according to national and local code. Auxiliary
power is wired into terminal block X01.
See Chapter Power electronics and cabinet
features, for wiring details.
Control cables
Control cables should be provided in accordance
with Table 23. Either single or multiple-twisted pair
cables may be used.
Control cables should not be laid in parallel to the
power cables. Attempt to keep a minimum distance
of 30 cm [12 in] between control and power cables.
Control and power cables should be crossed at an
angle of 90°. Control cables are wired to the IOEC2,
fieldbus adapter and terminal block X10.
See Chapter Control system, for wiring details.