Cable Length Between Drive And Motor; Ground Wiring; Motor Cable Length Vs. Carrier Frequency; Ground Wiring Examples - YASKAWA F7 User Manual

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Cable Length between Drive and Motor

The F7 should be installed as close as possible to the motor to minimize the length of the load side power cable needed
between the 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 parameter C6-02) as shown in Table 2.7.
The line side power cables, load side power cables and control wiring should be run in seperate conduit. Careful attention to
this recommended design practice will avoid many potential motor and Drive related problems.
Motor Cable Length
Carrier Frequency

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 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 could develop.
5. When using more than one Drive, be careful not to loop the ground wire. See Fig 2.4.
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Table 2.7 Motor Cable Length vs. Carrier Frequency
164 ft. (50m) maximum
15kHz maximum
OK
Fig 2.4 Ground Wiring Examples
Electrical Installation 2 - 11
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328 ft. (100m) maximum
10kHz maximum
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More than 328 ft.(100m)
5kHz maximum
NOT OK
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