VFD68 Variable Frequency Drive (575 VAC) Installation Instructions
13
3.
Use the same table to determine the recommended cable wiring size for the output current rating.
Calculating 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 10.
2.
Find the rated voltage (V) and maximum output current (I) from the rating plate on the selected VFD68 Drive.
3.
Use Figure 7 to determine the maximum recommended wiring length for the VFD68 Drive.
Table 9: Maximum Output Amperes and Wiring Sizes for VFD68Dxx Drives
Part Number
Rated
Capacity,
kW
(HP)
Maximum
Output
Current
(Amperes)
Cable Wire Size
AWG
1
1.
The recommended cable wire size is that of the cable (THHW cable) with a continuous maximum permissible
temperature of 75°C. Assumes that the surrounding air temperature is 40°C or less. (Selection example for use mainly
in the United States.)
PVC wire cables, (mm
2
)
2
2.
The recommended cable wire size is that of the cable (PVC cable) with a continuous maximum permissible
temperature of 70°C. Assumes that the surrounding air temperature is 40°C or less. (Selection example for use mainly
in Europe.)
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
Table 10: 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
Figure 7: Maximum Wire Length Calculation
Maximum Wire Length =
(11.55 *V)
(I*R)
V = Voltage rating (575 VAC)
I = Maximum output current (amperes)
R = Electrical resistance of the wire (milliohms/meter)
F
IG
:m
x
w
rl
n
gt
h_5
75
