When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
A 3% impedance line reactor should be used to reduce power line transient voltages caused by capacitor switching, line notching, DC bus overvoltage tripping, and inverter overcurrent and overvoltage conditions. Line reactors improve the true input power factor and reduce crosstalk between drivers. The input line reactor provides some protection to the driver in the event of a short circuit. If the kV-A rating of the power transformer is greater than 10 times the kV-A rating of the driver, it is advisable to use a line reactor to minimize the damage to the driver in the event of a short circuit in the power transformer. This line impedance depends on the drive's short-circuit rating and the power distribution transformer. Specifically, it is necessary that the line impedance is greater than or equal to the ratio of the power transformer rating to the driver
Please use your own conduit for the input power, output power, and control wiring. More specifically, the following principles should be followed when connecting the power supply and control lines of the VFD:
Install the input AC power cord in your own rigid steel tube.
Wiring the output motor in its own rigid steel tube.
The control line is installed in its own rigid steel pipe. The low-voltage DC control line and the 120 VAC control line should be located in separate conduits. When connected to the VFD's control board, both twisted pair and shielded wires are sufficient. It advocates the use of two-line and three-line connection. For many drives, the minimum wire size is 18 AWG.
Make sure all grounding joints are strong and properly grounded. The shield should be grounded at only one end of the cable to avoid ground loops. When connecting the shield layer on the VFD side, connect it to the chassis grounding lug. Note: It is necessary to disconnect the power supply to the VFD before connecting the shield to the VFD's ground lug.
Separate control and reaction wiring at least 12 inches from the power cord. Note: In a device with multiple VFDs, the input power lines of all VFDs can be in the same pipe, and the control lines can be in the same pipe, but the output wiring of each motor must be located in its own pipe. The only exception is if a VFD is used to operate multiple motors, and the output wiring of all motors can be in the same duct.
The driver is applied to the grounding system. Do not use floating ground. Some manufacturers do not advocate the use of float inputs on any sub-miniature or newer design drives. If there is no interference on the line, the driver should be working well - but severe common-mode noise may cause false tripping or worse.
Note: Some conventional VFDs use a string of resistors between the DC bus and ground, which means that common-mode noise is not an issue. Some integral-hp drives also use resistor strings, so it may be fine to use these floating grounds. However, floating-point systems are not advocated for newer drive technologies.
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