Measuring the insulation
See section
Measuring the insulation (page 84)
Grounding system compatibility check
See section
Grounding system compatibility check (page 85)
Connecting the power cables
■
Connection diagram
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.
a
c
f
b
d
d
1
PE
PE
L1
L2
L3
UDC+
U1
W1
M
3
T1/U T2/V T3/W
V1
L1
L2
L3
PE
3
UDC-
Drive
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.
a
Conduit ground. Bond the conduit to the drive's conduit box and to the distribution panel
enclosure. For a VFD cable installation see c and d.
b
Shield of a VFD shielded cable. Ground the shield 360° under drive's grounding clamp.
c
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 b.
d
If necessary, install an external filter (du/dt, common mode, or sine filter). Filters are available
from ABB.
f
114 Electrical installation – North America (NEC)
Содержание ACS880-11
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