AC100 HIGH-PERFORMANCE VC INVERTER MANUAL INSTALLATION AND WIRING Chart 3-5 AC100 Series Inverter System Earth Note: motor must earth as close as possible. Motor shell can’t be connected to the inner earth terminal of the inverter and it can’t share the earth net with the control system either. Power cable, motor cable, control cable of inverter Shielding layer (reticulate/armored) should be winded reliably by cable earth card and then fixed to inverter earth piece by bolt. Please refer to the following chart.
Chart 3-6 Cable Earth Card for Cable Earth Correspondence between inverter and motor cable length and carrier frequency When wiring distance between inverter and motor is long (especially low-frequency output), cable voltage drop will cause the motor torque reduction. Moreover, high-frequency leakage current will increase, thereby causing an increase of inverter output current, which would cause the inverter over current trip. And the current detection accuracy and running stability would be seriously affected. Please refer to the cable length in the following table to adjust the carrier frequency.
When system requires the wiring distance to be more than 100m, please adopt distributed capacity reduce measure (Such as “no metal conductor covers cable”, “wire each phase cable apart” and so on) Chart 3-2 Correspondence between Inverter and Motor Cable Length and Carrier Frequency 14 Cable length 20~50m 50~100m >100m Carrier frequency 0.6~16kHz 0.6~8kHz 0.6~4kHz 0.6~2kHz