4
9. Connect the power cables
IEC connection diagram with shielded cables
NEC connection diagram with symmetrically shielded cable or conduit
Note:
NEC installation can include separate insulated conductors inside a conduit, shielded VFD cable in conduit, or
shielded VFD cable without conduit. The normal dashed symbol (c) in this diagram represents the shield of shielded VFD
cable. The same solid symbol (b) represents conduit.
2. Use a separate grounding cable or a cable
with a separate PE conductor for the line
side, if the conductivity of the fourth
conductor or shield does not meet the
requirements for the PE conductor.
3. Use a separate grounding cable for the
motor side, if the conductivity of the
shield is not sufficient, or if there is no
symmetrically constructed PE conductor
in the cable.
4. 360-degree grounding of the cable shield
is required for the motor cable. It is also
recommended for the input power cable.
5. If necessary, install an external filter (du/
dt, common mode, or sine filter). Filters
are available from ABB.
1.
Two protective earth (ground) conductors. Drive safety standard
IEC/EN 61800-5-1 requires two PE conductors, if the cross-sectional
area of the PE conductor is less than 10 mm
2
Cu or 16 mm
2
Al. For
example, you can use the cable shield in addition to the fourth
conductor.
PE
PE
L1
L2
L3
UDC+
U1
W1
M
3
T1/U T2/V T3/W
V1
(PE)
(PE)
L1
L2
L3
PE
UDC-
1
2
3
4
4
5
3. Shield of a VFD shielded cable: Ground the
shield 360° under drive's grounding clamp,
then twist with the ground conductors and
connect under the drive's ground terminal.
Ground the shield also 360° at the motor
end, then twist and connect under the
motor's ground terminal. For a conduit
installation see b.
4. Symmetrically constructed grounding
conductors inside a VFD shielded cable:
Twist together, combine with the shield
and connect under the drive's ground
terminal and under the motor's ground
terminal. For a conduit installation see a.
5. If necessary, install an external filter (du/dt,
common mode, or sine filter). Filters are
available from ABB.
Note:
All openings in the drive enclosure must
be closed with UL listed devices having the
same Type rating as the drive Type.
1.
Insulated ground conductor in a conduit: Ground to drive's PE
terminal and to the distribution panel ground bus. For a VFD cable
installation see d.
2. Conduit ground: Bond the conduit to the drive's conduit box and to
the distribution panel enclosure. For a VFD cable installation see c
.
PE
PE
L1
L2
L3
U1
W1
M
3
T1/U T2/V T3/W
V1
L1
L2
L3
PE
3
UDC-
UDC+
5
4
4
1
2
3
