ABB ACQ800 Series, Руководство по оборудованию

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ACQ800-37 Hardware Manual 59
Planning the electrical installation
Selecting the power cables
General rules
Dimension the supply (input power) and motor cables according to local
regulations :
• The cable must be able to carry the drive load current. See chapter Technical
data for the rated currents.
• The cable must be rated for at least 70
°
C maximum permissible temperature of
conductor in continuous use. For US, see Additional US requirements on
page 61.
• The inductance and impedance of the PE conductor/cable (grounding wire) must
be rated according to permissible touch voltage appearing under fault conditions
(so that the fault point voltage will not rise excessively when a ground fault
occurs).
• 600 V AC cable is accepted for up to 500 V AC.
We recommend shielded symmetrical multicore cables for input cabling. Single-core
cables are also allowed, but unshielded single-core cables are not on IT
(ungrounded) networks.
WARNING! Do not use unshielded single-core supply cables in IT (ungrounded)
networks. A dangerous voltage can become present on the non-conductive outer
sheath of the cable. This can cause injury or death.
Symmetrical shielded cable must be used for motor cabling; see section Alternative
power cable types on page 60 .
Note: When continuous conduit is employed, shielded cable is not required.
To operate as a protective conductor, the shield conductivity must be as follows
when the protective conductor is made of the same metal as the phase conductors:
Compared to a four-conductor system, the use of symmetrical shielded cable
reduces electromagnetic emission of the whole drive system as well as motor
bearing currents and wear.
Note: The cabinet configuration of the drive may require multiple supply and/or
motor cabling. Refer to the connection diagrams in Electrical installation .
The motor cable and its PE pigtail (twisted screen) should be kept as short as
possible in order to reduce electromagnetic emission as well as capacitive current.
Cross-sectional area of the phase
conductors
S (mm
2
)
Minimum cross-sectional area of the
corresponding protective conductor
S
p
(mm
2
)
S < 16 S
16 < S < 35 16
35 < S S/2