Delta Electronics VFD-VL manual Loops, Grouning terminals

Chapter 2 Installation and Wiring

5.The AC motor drive, motor and wiring may cause interference. To prevent the equipment damage, please take care of the erroneous actions of the surrounding sensors and the equipment.

6.When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to the motor terminals U/T1, V/T2, and W/T3, respectively. To permanently reverse the direction of motor rotation, switch over any of the two motor leads.

7.With long motor cables, high capacitive switching current peaks can cause over-current, high leakage current or lower current readout accuracy. For longer motor cables use an AC output reactor.

8.The AC motor drive, electric welding machine and the greater horsepower motor should be grounded separately.

9.Use ground leads that comply with local regulations and keep them as short as possible.

10.No brake resistor is built in the VFD-VL series, it can install brake resistor for those occasions that use higher load inertia or frequent start/stop. Refer to Appendix B for details.

11.Multiple VFD-VL units can be installed in one location. All the units should be grounded directly to a common ground terminal, as shown in the figure below. Ensure there are no ground

loops.

grouning terminals

Excellent

grouning terminals

Good

grouning terminals

Not allowed

Revision Nov. 2008, VLE1, SW V1.03 2-5