AC70 VC CONTROL FREQUENCY INVERTER MANUAL INSTALLATION AND WIRING
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Chart 3-6:Cable earth card for cables earthing
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Corresponding relationship between inverter/motor cable length and carrier frequency.
While cable distance between inverter and motor is long (especially low frequency output), cable voltage drop will make
motor torque reduce. Further more, cable HF leakage current will increase. Then inverter output current will increase,
that will cause inverter over-current trip. The current detection accuracy and running stability will be impacted. Please
follow as below table to adjust carrier frequency according to the cable length. While the cable distance is over 100m,
please adopt distributed capacity reduce measure (Such as “no metal conductor covers cable”, “wire each phase cable
apart” and so on).
Cable length
<20m
20~50m
50~100m
>100m
Carrier frequency
0.7~15kHz
0.7~8kHz 0.7~4kHz 0.7~2kHz
Table 3-2: Corresponding relationship between inverter/motor cable length and carrier frequency
3.5 Machinery Installation
Installation notice and related requirement
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AC70 inverter components
Chart 3-7:AC70 series inverter components
