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 transients 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, the line impedance must be 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 communication power cord in your own rigid steel pipe.
Install the output motor wiring in your own rigid steel tube.
Install the control line in your 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 drivers, the Z-small wire scale is 18 AWG.
Ensure that all grounding joints are strong and properly grounded. The shield should be grounded only at one end of the cable to prevent ground loops. When connecting the shield layer on the VFD side, connect it to the chassis grounding lug. Note: Before connecting the shield to the VFD's ground lug, the VFD must be disconnected from power.
Separate the control and response wiring from the power cord by at least 12 inches. Note: In an installation with multiple VFDs, the input power cables 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 to this 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 it on the ground. Some manufacturers do not advocate the use of float inputs on any sub-miniature or newer design drives. If there is no disturbance on the line, the drive should be working well - but the harsh 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, the use of floating-point systems for newer drive skills is not advocated.
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