YASKAWA CIMR-DC4A0040AAA Technical Manual page 19

i.2 General Safety
Wire Gauges and Wiring Distances
Use a motor cable gauge large enough to avoid unstable converter phase control from voltage drop caused by a long
motor cable.
When using the digital operator remotely, always use the remote control extension cable (option). When controlling the
converter remotely using analog signals, limit the length of the control lines between the control signals and converter to
50 m or shorter and separate the control lines from power lines (main circuit and sequence circuits) to prevent induction
from peripheral devices.
When using a multi-function analog input, connect the shield wire to the sheath ground terminal E (G) with shielded
twisted-pair wires. Refer to Standard Connection Diagram on page 46 for details.
Generator Power Supplies
Select a generator with two times the capacity of the converter input power supply. Select the deceleration time, load, and
other factors so that the regenerative power from the motor is 10% or less of the capacity of the generator. For details,
consult with your Yaskawa representative or the nearest Yaskawa sales office.
Connecting an Advanced-phase Capacitor or Thyristor-controlled Device to the Power Supply
An advanced-phase capacitor is not required for the converter. Installing an advanced-phase capacitor will reduce the
power factor.
If an advanced-phase capacitor currently exists is in the same power supply system as the converter, install a series
reactor on the advanced-phase capacitor to prevent resonance with the converter.
If a device that generates voltage surge or voltage distortion, such as a thyristor-controlled DC drive or electromagnetic
mixer is installed in the same power supply system as the converter, consult with your Yaskawa representative or the
nearest Yaskawa sales office.
Countermeasures for EMC and High-frequency (Harmonic) Leakage Current
Although countermeasures are not required for harmonic currents, the same countermeasures for electrical interference
(EMC) and high-frequency (harmonic) leakage current are required as for a normal drive. If there are nearby devices that
are easily affected by electrical interference, use a reactor-type noise filter (e.g., zero phase reactor).
When installing an MCCB or RCD at the power supply, use an MCCB or RCD that is designed for a drive (i.e., one that
has countermeasures for high-frequency leakage current).
Compliance with Harmonic Suppression Guidelines
With respect to the harmonic suppression guidelines, the converter is equivalent to a three-phase bridge that does not
generate harmonics (K = 0), but the harmonic component is not completely zero.
5
Impact of Power Supply Distortion
Distorting the power supply voltage and connecting several devices in parallel to the same power supply will cause
power supply system harmonics to flow into the converter and increase the harmonic content.
YASKAWA ELECTRIC SIEP C710656 06F YASKAWA Power Regenerative Converter - D1000 Technical Manual 19