VFD68 Variable Frequency Drives (575 VAC)
13
High-Voltage Wire Size and Maximum Wire Length
Use UL Listed copper, stranded wire with insulation rated at 75°C (167°F) for wiring the high-voltage supply to
the drive (R/L1, S/L2, T/L3) and wiring the high-voltage drive output (U, V, W) to the motor.
Selecting the Correct VFD68 Drive for a Fan Motor
1. Determine the maximum current consumption from the motor ratings label.
2. Use Table 9 to find the maximum output current that just exceeds the motor’s maximum current
consumption and use the VFD68 part number associated with this maximum output current as the
recommended drive for the motor.
3. Use the same table to determine the recommended cable wiring size for the output current rating.
IMPORTANT: Use copper conductors only. Make all wiring in accordance with local, national, and
regional regulations.
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 (167°F). Assumes that the surrounding air temperature is 40°C (104°F) 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 (158°F). Assumes that the surrounding air temperature is 40°C (104°F) 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
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