Delta Electronics VFD-S manual Terminals +2/B1, +1 for connecting DC reactor, Grounding terminals

Chapter 2 Installation and WiringVFD-S Series

„DO NOT connect phase-compensation capacitors or surge absorbers at the output terminals of AC motor drives.

„With long motor cables, high capacitive switching current peaks can cause over-current, high leakage current or lower current readout accuracy. To prevent this, the motor cable should be less than 20m for 3.7kW models and below. And the cable should be less than 50m for 5.5kW models and above. For longer motor cables use an AC output reactor.

„Use a well-insulated motor, suitable for inverter operation.

Terminals [+2/B1, +1] for connecting DC reactor

„This is the connector for the DC reactor to improve the power factor. Please remove the short jumper when connecting DC reactor.

Terminals [+2/B1, B2] for connecting brake resistor

Bra ke resistor(o ptiona l)

Refer to A ppend ix B fo r the use of special brake resistor.

BR

+2 /B1 B2

„Connect a brake resistor in applications with frequent deceleration ramps, short deceleration time, too low brake torque or requiring increased brake torque.

WARNING!

Short-circuiting [+2/B1, B2] can damage the AC motor drive.

Grounding terminals ()

„Make sure that the leads are connected correctly and the AC drive is properly grounded. (Ground resistance should not exceed 0.1Ω.)

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

„Multiple VFD-S 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.

excellent good not allowed

2-24 Revision August 2008, SE09, SW V2.61