Electrical Installation 2 - 11
Cable Length between Drive and Motor
If the cable between the Drive and the motor is long, the high-frequency leakage current will increase, causing the Drive
output current to increase as well. This may affect peripheral devices. To prevent this, reduce cable length, or if necessary,
adjust the carrier frequency (set in C6-02) as shown in Table 2.6.
Ground Wiring
Observe the following precautions when connecting the ground wire:
1. 208-240Vac Drives should have a ground connection with resistance of less than 100Ω.
2. 480Vac Drives should have a ground connection with resistance of less than 10Ω.
3. Do not share the ground wire with other devices, such as welding machines, motors or large-current electrical equipment.
4. Always use a ground wire that complies with technical standards on electrical equipment and minimize the length of the
ground wire. Leakage current flows through the Drive. Therefore, if the distance between the ground rod and the ground
terminal is too long, potential on the ground terminal of the Drive will become unstable.
5. When using more than one Drive, be careful not to loop the ground wire. See Fig 2.4.
Fig 2.4 Ground Wiring Examples
Table 2.6 Motor Cable Length vs. Carrier Frequency
Motor Cable Length 164 ft. (50m) maximum 328 ft. (100m) maximum More than 328 ft.(100m)
Carrier Frequency 15kHz maximum 10kHz maximum 5kHz maximum
NO
OK
OK NO
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