Cable Length Between Drive And Motor - YASKAWA E7N Technical Manual

Cable Length between Drive and Motor

The Bypass unit should be installed as close as possible to the motor to minimize the length of load side power cable needed
between the Drive and the 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 2.1.
The line side power cables, load side power cables and the control wiring should all be run in a separate conduit. Careful
attention to this recommended design practice will avoid many potential motor and Drive related problems.
Table 2.1 Motor Cable Length vs. Carrier Frequency (C6-02)
Motor Cable Length 164 ft. (50m) maximum 328 ft. (100m) maximum More than 328 ft.(100m)
Carrier Frequency 15kHz maximum 10kHz maximum 5kHz maximum
(See the limitations on carrier frequency, based on Drive capacity and model number in Appendix B).
Electrical Installation 2 - 4
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