VFD68 Variable Frequency Drives
22
Calculating the Maximum Wire Length
Use the following steps to determine the maximum wire length.
1.
Use the recommended wire size in accordance with local, national, and regional regulations to determine
the electrical resistance of the wire (R) according to Table 22.
2.
Find the rated voltage (V) and maximum output current (I) from the rating plate on the selected
VFD68 drive.
Table 21: 575 VAC, VFD68Dxx Drives, Maximum Output Amperes and Wiring Sizes
Part
Number
Rated
Capacity,
kW
(HP)
Maximum
Output
Current
(Amperes)
Cable Wire Size
AWG
1
PVC wires, (mm
2
)
2
R/L1, S/L2,
T/L3
U, V, W
R/L1, S/L2,
T/L3
U, V, W
Earthing
(Ground) Cable
VFD68DFM
0.75 (1)
1.7
14
14
2
2
3.5
VFD68DGM
1.5 (2)
2.7
14
14
2
2
3.5
VFD68DHM
2.2 (3)
4.0
14
14
2
2
3.5
VFD68DJN
3.7 (5)
6.1
14
14
2
2
3.5
VFD68DKN
5.5 (7-1/2)
9.0
14
14
2
2
5.5
VFD68DLN
7.5 (10)
12.0
12
14
3.5
2
5.5
1.
The recommended cable wire size is that of the cable (THHW cable) with a continuous maximum permissible
temperature of 75°C (167°F). Assumes that the surrounding air temperature is 40°C (104°F) or less. (Selection
example for use mainly in the United States.)
2.
The recommended cable wire size is that of the cable (PVC cable) with a continuous maximum permissible
temperature of 70°C (158°F). Assumes that the surrounding air temperature is 40°C (104°F) or less. (Selection
example for use mainly in Europe.)
Table 22: Electrical Resistance by Wire Size
Recommended
Wire Size
1
1.
The mm wire sizes that are given as equivalences to the AWG wire sizes are not commercially available.
Electrical Resistance of
Wire (milliohms/meter)
Recommended
Wire Size
Electrical Resistance of
Wire (milliohms/meter)
25
mm
2
0.727
5.3
mm
2
(
10 AWG)
3.28
21.2
mm
2
(
4 AWG)
0.815
4
mm
2
4.61
16 mm
1.15
3.3
mm
2
(
12 AWG)
5.21
13.3
mm
2
(
6 AWG)
1.30
2.5
mm
2
7.41
10
mm
2
1.83
2
mm
2
(
14 AWG)
8.28
8.3
mm
2
(
8 AWG)
2.06
1.5
mm
2
12.1
6
mm
2
3.08
