ACS2000 User manual 2UEA001270 Rev. F 6-3 (16)
Chapter 6 - Electrical installation
6.3 Cables and wires
6.3.1 Medium voltage power cables
Cable insulation The cables to the main power input busses of the drive can be exposed to
common mode voltages resulting from normal drive operation. For this
reason, shielded cables rated 5 kV (phase to earth/phase to phase) or
higher must be utilized. All power cables must be terminated with stress
cones.
Three-core cables A cable with three individually shielded conductors is recommended to
ensure compliance with EMC (Electro Magnetic Compatibility)
requirements, and to provide a low impedance high frequency path
through which the common mode currents can flow. Shields should be
terminated and grounded to a low impedance conductor at both ends. The
drive includes a ground bus within the cable termination compartment in
order to facilitate this.
A non-shielded three-core cable with a continuous corrugated aluminum
armor may be used as an alternative. Steel armored or interlocked
aluminum armored cable should not be used.
The maximum installed three-core cable length should not exceed
300 meters [1000 feet].
See Appendix H - Power Cable Specifications, located on the CD, for
detailed cable information.
Single-core cables Shielded single-core cables may be used, provided
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.
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