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Planning the electrical installation
62
• 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
.
• 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 an ground fault
occurs).
• 600 VAC cable is accepted for up to 500 VAC. For 690 VAC rated equipment, the
rated voltage between the conductors of the cable should be minimum 1 kV.
For drive frame size R5 and larger, or motors larger than 30 kW, symmetrical
shielded motor cable must be used (figure below). A four-conductor system can be
used up to frame size R4 with up to 30 kW motors, but shielded symmetrical motor
cable is recommended.
Note:
When continuous conduit is employed, shielded cable is not required.
A four-conductor system is allowed for input cabling, but shielded symmetrical cable
is recommended. 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
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Summary of Contents for ACS800-07-0610-3
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