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The table below shows the line-to-ground voltages in relation to the line-to-line voltage for
each earthing system.
Electrical power system type
U
L3-G
U
L2-G
U
L1-G
U
L-L
Symmetrically grounded TN system (TN-S sys-
tem)
0.58·X
0.58·X
0.58·X
X
Corner-grounded delta system (nonsymmetrical)
0
1.0·X
1.0·X
X
Midpoint-grounded delta system (nonsymmetrical)
0.5·X
0.5·X
0.866·X
X
IT systems (ungrounded or high-resistance-
grounded [>30 ohms]) nonsymmetrical
Varying level
versus time
Varying level
versus time
Varying level
versus time
X
TT system (the protective earth connection for
the consumer is provided by a local earth elec-
trode, and there is another independently installed
at the generator
Varying level
versus time
Varying level
versus time
Varying level
versus time
X
Connecting the power cables – North America (wiring in
conduits)
Use insulated wires suitable for the installation in electric conduits. See the National Electric
Code and Local ordinances.
Note:
ABB prefers the use of a symmetrical shielded motor cable (VFD cable).
74 Electrical installation – North America
Содержание ACS480
Страница 1: ... ABB GENERAL PURPOSE DRIVES ACS480 drives Hardware manual ...
Страница 2: ......
Страница 4: ......
Страница 12: ...12 ...
Страница 23: ...See https library abb com en for all ABB product documentation on the Internet Introduction to the manual 23 ...
Страница 24: ...24 ...
Страница 34: ...34 ...
Страница 122: ...122 ...
Страница 124: ...Frame R1 Frame R1 front side IP20 UL type open 124 Dimension drawings ...
Страница 125: ... Frame R1 bottom rear IP20 UL type open Dimension drawings 125 ...
Страница 126: ... Frame R1 front side UL type 1 kit installed 126 Dimension drawings ...
Страница 127: ... Frame R1 bottom rear UL type 1 kit installed Dimension drawings 127 ...
Страница 128: ...Frame R2 Frame R2 front side IP20 UL type open 128 Dimension drawings ...
Страница 129: ... Frame R2 bottom rear IP20 UL type open Dimension drawings 129 ...
Страница 130: ... Frame R2 front side UL type 1 kit installed 130 Dimension drawings ...
Страница 131: ... Frame R2 bottom rear UL type 1 kit installed Dimension drawings 131 ...
Страница 132: ...Frame R3 Frame R3 front side IP20 UL type open 132 Dimension drawings ...
Страница 133: ... Frame R3 bottom rear IP20 UL type open Dimension drawings 133 ...
Страница 134: ... Frame R3 front side UL type 1 kit installed 134 Dimension drawings ...
Страница 135: ... Frame R3 bottom rear UL type 1 kit installed Dimension drawings 135 ...
Страница 136: ...Frame R4 Frame R4 front side IP20 UL type open 136 Dimension drawings ...
Страница 137: ... Frame R4 bottom rear IP20 UL type open Dimension drawings 137 ...
Страница 138: ... Frame R4 front side UL type 1 kit installed 138 Dimension drawings ...
Страница 139: ... Frame R4 bottom rear UL type 1 kit installed Dimension drawings 139 ...
Страница 140: ...140 ...
Страница 163: ... Declaration of conformity The Safe torque off function 163 ...
Страница 164: ...164 ...
Страница 172: ...Dimensions 172 BIO 01 I O extension module ...
Страница 178: ...178 ...